Big cam idle surge. The surge will likely be due ...

Big cam idle surge. The surge will likely be due to fuel. and reassemble. Check / adjust low idle screw setting. #20 · Nov 10, 2014. Do this four or five times and this should reset the idle. Its idling now at 1100 rpms. It causes a lot of intake reversion which causes the engine to basically choke on it's own exhaust during idle. Mine does that. Clean or replace pre-filters and screens, check for fuel line restrictions. That's the best way I can describe it. Idle RPM PN-Gear Ramp Out: This value controls the rate at which the PN-Gear Adder ramps out. IMO, yes, it’s low. This car cam to us with a blown LS7 . Simon Goodman. The p0441 I get a lot, and usually it fixes itself when i remove the gas cap and let the gas vapors escape. Never had an issue. If the RPMs hit this limit while the idle circuit is tripped the ECU will cut fuel until the RPMs drop to an acceptable level causing a surging idle. Re: A fix for a big cam low vacuum UPDATE KEn hawkins. Surging typically isn't a convertor issue. High Idle: Master Enable/Disable high idle control. 619"/. 475lift 270dur, 60mm tb, cold air, 6-1 header, 2. #4 · Apr 3, 2006. E85 racer and E85 carb builder. 7. 0 has an idle problem. Your particular engine will determine the actual amount of advance, so let’s look at a real world example. 44@120. Low idle and fluctuating idle symptoms and trouble codes. If the IAC is dirty then it could stick more open than the ECU wants; no idle drop, or not increase idle when the ECU wants more idle. While running the very small cam, we were rewarded with 18. Telephone: +965-55446651. Sep 2005. A clogged or obstructed air filter can cause surging at idle, and foreign objects can enter the filter housing at any time. With two heavy springs it should be all in around 2500 RPM. the car also has LT headers, Kooks high flow cats, Flowmaster 44 and header dumps. About a year and a half ago, I started having idle issues and went through about everything I could find to correct it. Ive recently put a fresh big block 454 in my 69 camaro its pretty modified with a big cam. any clue what else I can check? I just removed my 450 holly and installed a 650 edlebrock on my chevy 350. Quad Cities, IL. Also check your air/fuel ratio at idle and through the rev range either on the road or dyno runs. Registered. 4,223 Posts. The yellow check engine will turn on for a few seconds then off. The motor is from an 88 1 ton pickup and went into a 89 half ton Suburban that had a tbi 350. Certainly you should not plan a long road trip with it untuned. MedicineMan, Aug 30, 2010. )0. Big big cams can idle rock solid at that rpm though so it's not too low of an rpm. This serves two purposes, one is when you are driving and . If the idle is too high, it could simply be high because of adjustment, or some other issue could be causing the high idle. For example, if you have a cam that's between stock size and 224 degrees intake duration, try an initial target idle speed of 800 RPM. There is a topic that addresses this issue. I also am having trouble at the track stalling my converter past 1500 rpm before overcoming the brakes. Bike runs smooth good fuel milage, Thought maybe time for spark plugs and installed NGKs and a KN air filter. horsepowerinnovations. However currently I can’t drive the car till it reaches 180deg. In fact, when I am tuning for driveability, I never use one. Intermittent drops in vacuum at idle . Don't drive it much until it is tuned. The ls3/525 cam is 226/236 with 110 lsa. Apr 01, 2018 #5. 8l Turbo engine with 130,000kms. Drive the car for approx 10 minutes to get it up to operating temperature. Over the course of several months, I tried new vacuum lines, IACV, PCV, plugs, wires, thermal plunger, and MAF sensor. 9, but it seems pig rich, spark @ 31°, RPM 900. 6L 2-valve. 72 60ft. Idle w/ big cam IMHO, the spark curves are a little too aggressive for high compression engines w/ big cams and a lot of overlap. 462 heads, big valves. In gear was the problem. 408 SBF, 244° @ 0. If I put it in neutral it's fine. Comp Cams solid FT -. R/D was at 875 which made fighting the car coming to a stop. check that you have enough fuel flow to carby. In the guide below we show you the most popular issues and how to fix them, EV's also have surging issues which we address in this guide. then use a 24" breaker bar with 1/2 drive impact 17mm hex head socket. Cam change is one of THE most common causes of idle surge. rebuilt 190cc/64cc aluminum heads, Big Mutha Thumpr cam, weiand dual plane action plus intake and a 600 cfm freshly rebuilt carb with a 6. The stock cam is 204/211 with 117 lsa. Actually, considering the smooth idle, strong low-end torque and . restored from death 2012 Chevy Caprice PPV. Hey guys, I recently made a post about the car not running right when it got hot, and now the engine is surging at idle once it warms up. The stock tune is around 13* to 15* timing at idle. i took it to my engine builder and began a swap. sb5walker said: Set your base warm idle to 750, without A/C, and if you still have the problem when A/C comes on, screw in the A/C idle speed adjuster - the big plastic hex-shaped screw attached to the engine side of the plenum between the "E" and the "F". 4. Was terrible at idle surging from 450 to 975 rpm and often would die . Every E cammed car I've ever worked on needed this to keep a stable idle. Check the timing both in and out of gear. Since the VTC is enabled, we can retard the intake to 0degrees to minimise the overlap. I won't go into detail now, but the most recent development was that it was idling very rough, so I cleaned the idle air control valve, and since then, it's been doing the same thing. Turn ignition switch to off. I had them check again that the rear fuel heater was enabled and apply the latest update. If one or more of the sensors are malfunctioning, you will have problems. 302. Originally Posted by Danny Cabral. When warm the idle is smoother than the quick fuel carb ( worked well but I had same experience as your buddy). 500Int. My questions are really centering around idle. 9. My 67 recently started to have an issue with poor idle and a bucking and surging condition under part throttle. I would try connecting the vacuum advance to a manifold source - more timing at idle seems to help big cammed engines idle better. When installing the Cams did you make sure the bolt for the cam is in the right orientation so that oil flow for the cam phaser is working properly, as this is used to adjust the timing dynamically. Discussion Starter · #1 · Jan 9, 2012. Share. use the noggin. When accelerating and shifting from 1st to 2nd, or most any other gear, it'll "miss" and do a momentary "buck" when releasing the clutch and giving it gas. NOTE: The idle speed can vary on some applications. Cam is 281 283, . Does sound like is pulling in air. 4L engine. Bader Norris. 01-01-2021, 07:38 AM. 1. 5 turns. When I start my truck and let it idle you can hear a surge in the exhaust like a racecar with a big cam does. Full vacuum advance limited to 52*, or less. 2018-04-01T15:15. One problem I have and understand it is fairly common in cammed M6 6gens, is that the rpm will drop below idle speed for a second or two before returning to idle speed when disengaging the transmission when stopping. some of it has to do with the cam, but most of it has to do with the fuel cycle. As a daily driver this cam would suck big time. #5. Mods are jlt cai ,bbk long tubes with offroad x pipe , pipes mufflers, steeda underdrive . mild cam idle surge and basic settings - tune and log attached. 4:1) from 9. This datalog shows it a bit better. 0 due to a cracked head. If it goes away try a new sensor. Set the timing to 12 degrees, maybe 12. Hey lemonice, we have ran three different superchargers, and two of them were in a boat. Motor block was sent off to machine shop with crank, pistons, rods, and push rods to be balanced and blue printed. With VTC enabled. Accelaration is very strong under throttle. Ford reports that the symptoms show as an idle speed that drops below the recommended speed or the vehicle exhibits a fluctuating idle. Distributor vacuum at full manifold vacuum, ported vacuum, and disconnected. weiand open hi rise intake. This can go as far as shutting the rears off and closing their butterflies. Very little differance ,still surges ,Any suggestions on what I should do. I prefer to drive my Challenger, fast, like breaking the speed limits everywhere I go, all the while spewing toxic exhaust fumes. 650cfm holley 4150. 0. I had the ford hot rod cams installed seversl months ago . I have a 2011 Camaro with an ls3 (manual) and a Brian Tooley Racing stage 4 cam. It runs and sound wicked, especially the idle. 050, 10/1 CR. This happens probably 75% of the time, and only after it has warmed up. improper air/fuel ratio, low ignition timing, and low idle rpm all cam lower idle vacuum. Depending on the amount of overlap that cam has,it could be blowing a lot of the intake charge out the exhaust at low speeds. This procedure can be used with aftermarket camshafts, superchargers, turbos & conversions in both Auto & manual configurations. Both areas run fine. I don't think it would be a culprit, but who knows. This is the fix for a stuck/high/surging idle. As the situation becomes worse, it can also cause the vehicle to stall. Setting the clearances loosely causes parts of the valve mechanism to hammer together, damaging valves and creating a knocking or rattling sound. Typically anywhere from 50-150RPM of surge is normal for a larger cam or a light rotating mass, and trying to fight it can end up causing larger speed fluctuations and instability. electric choke hooked to 12v switched. On a car with a lighter rotating mass (such as an aluminum flywheel), or with quite a bit of natural idle surge from a cam, the stock corrections may be too extreme. By definition, blower surge is a rhythmic acceleration and deceleration of engine speed at idle. Have pump recalibrated or replace injection pump. We want the idle to ideally be about 800 with the throttle body screw turned out (throttle closed) and letting the idle valve provide the real control. The car needs tuned. But what that does is uncover the idle transfer slots, letting even more fuel be drawn at idle and it'll run like crap. Work carefully and slowly to achieve the best results. Idle speed setting . While cruising @ 20 in 2nd, 30 in 3rd, 40 in 4th, engine has big cam lope sound and bike seems to stumble or possibly surge. I have a 2005 300c that has developed a surge when it is at a constant speed, (most notably around 35). Engine vibration ? Air Supply. #11 · Mar 20, 2005. This is my first build so please excuse my ignorance. I've tried to scrub every memory of them POS motors from my brain. 54,126. Usually a turn or turn and one half is about right for the screws. It sounds like low ignition timing. Discussion Starter · #1 · May 18, 2016 (Edited) Only show this user. Exhaust Valve Lift (in. 2. I like it so it can idle out without polluting my small house first (13. I only have the issue in drive or reverse at idle. Dragonary. Idle sounds like a bracket racer car. ~12:1+ compression, has stock 67' 302 pistons. Is there a system which is proven tolerant of the overlap of this cam, and able to idle when cold? 104 Posts. I have the following mods done: K&N Typhoon intake ported throttle body Underdrive pulley Adjustable cam gears set at 0 Magnaflow exhaust Big 3 grounding kit Centerforce clutch Surging idle on Honda vehicles How to fix a surging idle on Honda vehicles. 2004 Pulse Red M6. Its set to idle at 1000rpms and it does but just barley. Take apart the 10 pin connectors. 6. On this episode of "Tuned" we dive into explaining cam surge on HP Tuners Software with this LS7 Z06 with some goodies. 5in exhaust, n42, msd-6AL Thats all i know, if you can get near a ballpark figure, that would be nice. 4 Posts. www. If the cam is too big, no amount of tuning will get the vacuum up to power brake levels. Idle AFR With Big Camshaft? Novice help please. But that usually means you will see it wet with fuel around it. 1/2" wood carb spacer. This is called overlap. 11 rear end. I've heard "stories" that it will work down to around 5" idle vacuum. The other was in my 70 chevelle. I don't have any vacuum leaks. Use tool, Part . 5. Disconnect fuel injectors, one at a time, until the idle drops below 1000rpm. 598, 112 lsa. my '90 5. Off idle the IAC has no effect on rpm. Check / replace injectors. Only thing upstream from the throttle on a 7A is the intake air-temp sensor and that does bugger-all so it'll definitely be downstream. 4L - Last summer while sitting in traffic, waiting on the on ramp to the freeway, my truck started to idle really rough. M. Apr 1, 2014. Most of those are simply out of tune or suffering from a major malfunction, like an . EFI or electronic Fuel-injected system requires a minimum voltage to operate correctly. 319 sixty foot on motor. If you want the big cam sound, pick a cam with a tight LSA but a lot less duration to keep the RPM HP peak below 5800 and overlap at or below 60*. if you don't have it idled up a bigcam can idle 300 to 400 rpm. Big cams like a lot of timing advance at idle and low rpm. Fill fuel supply tank. we have ran belt driven, and cam driven 80A, and 110 enderle fuel pumps. If the timing is falling way back in gear, that's most of your problem. I am the original owner and car is completely stock. The issue: Engine warm sitting still, the RPM's dip so low it almost stalls. 105k miles. In total there will be vacuum lines for the cam breather (plenum to cam cover), PCV (cam cover to manifold), MAP sensor, brake booster, fuel pressure regulator, and charcoal canister, then the idle-up circuits for the A/C and P/S. Location: New Hampshire. Remove the plug from the spring pack cover. Around town is 45 to 55 kPa from 1000-1500 rpm. It is used to control idle speed by the ECU from inputs, like ECT sensor. These will be a good, easy starting point depending on your engine setup. Thanks! Carl. I checked the TPS voltage, it's in the OK zone. Thats one of the big reasons that larger cams idle dirty at low speeds. 3,345 Posts. I have set idle mixture screws to factory recommended 1. As soon as the light turns off turn ignition to off. After ’85 the engine was engine was still supplied by Cummins up until 2000, with engineering supersessions from . Most computer controlled vehicles rely on the coolant temperature sensor to tell the computer whether the engine is cold and needs a rich mixture. I like the ported source though for my engine since it has a more "reasonable" 236* duration cam. Setting the clearances too tight can prevent valves from completely closing . To help with the idle surge, set your lowest minimum idle speed to all minimum idle tables. Me like it’s basically in the same place as before, but it immediately seemed to respond better at idle and in the throttle. 7. O. Wait a couple seconds and repeat. This will enable you to set primary idle circuit. 030 with exhaust centerline set at 108degrees. I did some math and the welding wire would take it down to around 0. 1 Posts. Only show this user. 1972 Chevy Nova - 12. The R&D "Big Cam" Engine Idle Tuner kit is a simple bolt on parts kit that works to remove the O. 5" at idle now. Set idle ign timing at 12 degrees. A small bypass needle and seat are easily adjusted to set the idle speed which allows the throttle plates to remain in the proper position. 62 60ft. Mark the rockers of the valves and injector you have just set with a white pen to keep tabs on what you've done. Also cam timing and piston to deck will contribute to detonation. What's driving me crazy is that it will idle perfect and then all of a sudden start increasing idle speed on its own and then after about 30 seconds it will return to idle and then repeat. If I push back on the cam it returns to idle. It had a slight lope to it, but it didn't sound too crazy either. Problem you can have with big cams and overlap is that you can get air passing right though the cylinder into the exhaust making the WB say it lean when its really not. Here is a video: YouTube. there is an adjustment screw that can be used to set it higher but I forget where it is now. But I'm starting to notice a surge in the idle. Nice and lopey, has a nice chop to it and sounds crackly, not that consistent lope, but a bada$$ erratic one. Refer to the fuel pump code for the specified engine idle speed. Note that the 100 kPa column mimics a regular spark curve with timing all in by 2500 and 34* total. Note the reading on the vacuum . per click that I'm aware of, several years ago I made a sealed screw driver that after removing the 1/8 th pipe plug in the back of the spring pack housing I can install the screw driver and adjust the idle rpm. 1998 Camaro SS (cam, heads, nitrous) 2002 Camaro SS (turbocharged) LS7 Factory Five GTM (turbocharged) Ford: 2011-2019 Ford 5. 5" full exhaust with Hooker # 2455 Headers. full 50degrees. Reactions: trucker378. There is no known rpm. I bought a 1974 Chevelle malibu (laguna) With a bad motor a few months ago. 5 (assuming decimals are a thing in timing) it’s just slightly advanced from the little hash mark in the block and distributor. When I set my advance, I just rev up the motor and set my total advance that I want with vac line disconnected on the dizzy (say, 32-38*) and then I tighten the dizzy clamp. Our man Pat has been rebuilding pumps and injectors for 35 years. #3 · Jan 7, 2010. fourwd1 said: When the idle surges when the brake is applied, it's usually because the idle is too high, as stated above. Check TPS voltage and clean the IAC. 5 turns out. 4,285. * What I already checked/replaced: - DISA inspection, cleaning . WOT is 98 kPA. 36@109. 2015 Dodge Challenger - 11. #1. 3. Yes, you can do it without a wideband. My truck was in the shop for a egr leak. When you do drive it, baby it and do not go WOT. Depending on your bike’s model of Harley Davidson, manufacturers must have recommended a particular RPM range. Discussion Starter · #1 · Dec 17, 2012. 7L, and 4. i . Here at Pittsburgh Power, we’ve been rebuilding Cummins fuel pumps and injectors since 1983. What was happening was that when coming to a stop, and engaging the clutch, the idle would drop to below 500 rpm and then jump to 1500 . 3 with a rough idle. Idle fuel @ 13. Clean the throttle body or carburetor venturi (s) after replacing a severely dirty air filter. And check the secondaries to see that they are also shut. No such luck on fixing the idle. Timing is set at 10 BTDC. I only have 25 miles on motor. The spark plugs and wires are also critical to the ignition system. 1971BB427Memberfrom Oregon. 2004 torrid red with red interior A4 GTO (1 of 499) Fullsize Truck & SUV - 1999-2006 GMT800 & 2007-2013 GMT900 Platforms. With both my original carb and my last EFI unit, the RPM was solid, so it's definitely capable of a smooth idle. I decided to stick a 0. Total= about 38-40 all in at 2600 rpm. 5" Hg vacuum) at 950 rpm. NOTE: Also the car may still run and surge a little when you first start if you have a big cam, generally F303 and up. Running with stock programming with a low idle speed setting combined with the fact the chip is designed for 20-21″ of vacuum at that idle rpm with a cam upgrade which typically drops the vacuum to 18″ or less will cause the motor to run too rich which will spawn a high idle speed . . Damaged Valves. I like 18* initial. Install the fuel pump idle adjusting tool into the plug hole. It revs really high, about 3000-4000 RPM, before just about dying, at which point it repeatedly revs up to 1500 RPM and then almost stalls. Go to Engine>Idle>RPM tables and Add 200 rpm to the four idle rpm tables. 65mph w/1. I have noticed once in a while my truck will lope like it has a big cam in it or something. #5 · Mar 29, 2016. First step is to dial in you RAF table, then get your fueling perfect in those areas, and then deal with spark. Idle is 55 kPa (13. The key is to adjust the TPS voltage and reset the computer whenever the idle screw is changed. Save. Intial idel screw position is 1. Usual culprit is a centrifugal and/or vacuum advance kicking in at idle. I run idle speed activity -20, Idle fuel +10, Idle spark and [email protected]@1000 and [email protected]@1750 at -10, and [email protected]@1000 and [email protected]@1750 at -6. One cam or the other is a little off, just because it sounds like its running properly does not mean it is. Defective Spark Plugs/Wires. I've had P0303/P0300 kick out. There are no vacuum leaks at intake manifold to cylinder head surface, carb base plate, or carb linkage. It does eventually work out if it. And it always stalls eventually at idle if i don't intervene by playing with the throttle slightly. Idling quality is radical with the typical killer vtec blurp. Turn kill switch to run. If you wish to drill your throttle body, I would quote this approach rather than "wing it": To adjust idle speed, set up idle within the right range of RPM for the model of your motorbike. If this is your first visit, be sure to check out the FAQ by clicking the link above. this will be my daily driver starting NOW. took it to a shop. I have a problem with rough idle that has gotten worse over time (8-9 months started at 110,000kms). comp cam 236 @. I have a chevy 350 in my 57 truck with what I was told is a 290 duration cam. my set up is a 1967 350 2 bolt main with a 400 turbo and 4. 874 Posts. BOBCRMAN, Oct 9, 2012. Idle quality is relatively decent with my FiTech, but I have a lot of driveability issues under 2000 rpm. A CAM that size is going to be pushing the stock stall pretty hard. Joined Aug 22, 2012. I have the dizzy timing advance connected to timed vacuum port on carb. no getting around that without doing a special mod to the engine. Nah, didn't take it that way. Vacuum advance will typically advance 14°-15° if still stock. Here is something I've done to make the idle air bypass adjustable. Sign up for FREE! Become a GM-Trucks. Most of the time it is bouncing from 800-950rpms then settling at 1000rpms for a few seconds. Then it switches to closed loop and uses the sensor data to control the computer. You can smell a rich mixture during idle. ) to start will be about right. Turn the ignition off & back on and it idles fine until the next stop light. I was reading old posts over at the place and some suggested that it was a bad fuel rail pressure regulator (FRPR) or it could also be a loose reluctor wheel on the crankshaft sensor. Just dremel out a little at a time till it idles around 1k. Cruise at 60 mph is 40 kPa at 2200 rpm. Rotate the engine to the next timing mark and set the appropriate valves and injector. change the damn ground strap behind the heads and change the battery cables. My 396 with the Comp Cam 306 (230/244 duration) did it when under 2500 rpm. A wide variety of issues can prompt an engine surge. Let's head over to Ray's house and see if we can figured out his foxbody surging idle issues. Rotate ignition switch from off to ignition. The TPS with key on engine off should be less than 1 volt. unknown cam, i just changed my plugs, coil, has MSD ignition, etc. Try this. Any debris in the filter or housing might restrict air flow to the engine enough to affect idle speeds. 5 In-Hg of manifold vacuum, 402 horsepower, and 441 lb-ft of torque. If the fuel pump is causing idle problems, then it won't be able to keep up at all with flow demands under power, so if it is at all driveable, the fuel pump isn't causing an idle problem. IT will idle, but vac is low and adjsting the idle screws does not change vac. This is mainly due to being able to advance timing at idle, which most larger . I don't know my exact cam specs but it seems to have a good amount of overlap and 9" of vac at 900 rpm idle. 6/1 on the big block with a EFi style roller cam). #7 · Mar 8, 2009. any clue what else I can check? The ECU has a limit set into it that idle speed should never go over. Also check for vacuum leaks. I would tuning it so it idles nice and forget about what the WB says. Its not missing and it seems to run good. motor is built to take 350 plus shot but need to get the little bugs fixed first. The bad guides allow the valve to move around a bit while the valves are at their lowest opening point, and the bad lobe will effectively kill that cylinder at low lift. So far as the AC I think that is a separate issue. The ECU has a limit set into it that idle speed should never go over. As soon as you throw it in gear it drops back, making the RPM drop worse than it would ordinarily be. Unplug the exhaust back pressure sensor while running. #4 · Sep 2, 2011. Big bore strokers like mine should idle about 1850-1950 Stock or big 3 about 1450 or 1500 07-700(686) based 778cc Cuervo Racing, +2 extreme port Cuervo head port and a Cuervo/HDD5050 cam, 14:1CP piston,105. Go to Engine>Airflow>Dynamic tab and lower the High rpm disable/re-enable to 400/300 respectively. jrush331. I want it at 850 to 900. Same part number for fuel pumps. 5 bore, +5 stroke, WK54mm TB, Denso injector, dynatek programable ignition, old pc5, DMC Force 4 pipes. 1 comp, solid roller cam int 632/236 ext 637/240 113 lsa ls6 intake, ported & polished throttle body with 2 1/8 holes drilled. what heat range spark plug are you using. 8:07 AM. If you wish to drill your throttle body, I would quote this approach rather than "wing it": It starts but its runs incredibly rough, and there is a delay in throttle response. Also there may not be enough vacuum to keep the PV closed, adding to the problem. DavidA. I have a 383 with 9. The engine will need at least 25 degrees of timing at idle with a cam big enough to only produce 7 or 8 inhg. 035 welding wire into the idle air bleeds to see what it would do. No info on lift. com. C. 486Intake Valve Lift (in. AIC (Air Idle Control) Stepper Motor from the throttle body, and replace it with a fully adjustable, all billet needle valve assembly. 1999 7. The R&D Kit allows precision "Idle" air volume adjustments to be made and securely locked down when "Higher Lift", "Larger Duration" Camshaft kits are used . I wouldn't expect it to idle much less than 1000 RPM though. Turn lights, A/C off. 595 . 090-. what fuel system do you run, mechanical pump or electric. When I read the forums this phenomenon pointed to a vacuum leak. 5:1 static compression, 234/238 @ . Of you have an X303 cam and worked GT40P heads, let it get a little warm and stab the gas to clear it out and then bam, it sit right between 900-950rpm. If your engine has a big cam and must idle at a higher speed, that's OK. A 40 to a 20 and open the shaft screw would be around 50/ 60 psi, or way to much. In this document, we will go through the basic steps to get your idle control setup using VCM Suite. Maybe it throttle is letting in too much air at idle. High Idle RPM: Desired high idle speed. 100), and make removeable restrictors in the channel where the air bypass enters the top of the baseplate. You may find it out in the manual of your vehicle. the engine runs perfectly but i am now noticing a slight surge in the idle when the motor is alloed to idle for more than a minute of two. I'd guess if it's at 5" now, it sure wont triple, and something much closer to 15" will be needed for power brakes. If it's a somewhat big cam, I use the manifold vacuum port of the carb for my dizzy. 77 280z: 10:1 h/c, flat tops, . A vacuum gauge needle that vibrates rapidly at idle and then seems to smooth out with rpm can indicate bad valve guides or a bad cam lobe. This was 4 months ago. Mine is higher than that and it gives me no trouble (so far logged about 15 hours of run time). muffler delete and intake cone in stock housing. 078. 01 ECSB 1/2 ton 4x4 Forged 5. But if you compare two cams with the same [email protected] spec, but they have different LSA specs, usually the tighter LSA cam will . Flip carb over and open up secondary throttle plate stop another 1/4-1/2 turn. LA_Phantom. You can thank the EPA for the lean conditions on our Challengers and all new cars, which leads to throttle surge. It's a good street cam for a daily. The 855 Big Cam is regarded as one of the last true variable timing mechanical engines on the heavy duty side before electronics came into play with the N-14. If the cam is between 224-236 degrees duration (again, on the intake side) try a target of 900 RPM and for cams bigger than those listed above, set your target engine idle speed to 975 RPM. Seems to. Park but keep the engine running. ss monte. Goes from around 850 - 900 to 1100 rpms at an idle. Specs for Big Mutha Thumper: Comp Cams 249-12-602-4. When I bought this car it had a busted timing chain guide and it also jumped . Most of the time the bike idles a smooth 1000 rpms. I had about 9. A 40 to a 20 would be about 25psi. It's a '69 400" Pontiac. Reply. However, engine surging will usually re-appear; either under specific operating conditions, or randomly. First off, I have no experiece adjusting a carb with a big cam. Hello, I was wanting some opinions for idle speed on a cam. 1999-2013 Silverado & Sierra 1500. He came to work for us in 1985 after attending Rosedale Technical Institute for Diesel Mechanics. Valve to Valve clearance is at 1mm or 0. Holley’s new line of Ultra XP carburetors offer these bypass holes drilled adjacent to the air cleaner stud. What is the proper idle speed for a 351C? (has V4 heads a C6 trans, has A/C, holley 650cfm with vac secondary, choke is getting 12V i checked with a volt meter). I give it a slight rev and idle smooths out, but then gets . The stalling at a stop is typical after a cam install. Just got a cam swap and tune. 2200 stall converter, HEI, Edelbrock 750. The idle was stable with the 450 carb but now surges with the 650. The engine runs in open loop for about the first minute. lol. Alto, MI. It stalls whenever you turn the truck sharp either direction. Idles it's best at Full (7-8") vacuum. Hey all! I got an ls1 04 A4 GTO. no effect. COMP Cams 11-250-3: Xtreme Energy 284H Hydraulic Flat Tappet Camshaft Only Lift: . A good tuner could fix this such as EFI Tuning. The engine was first introduced in 1976 and mass produced up until 1985. MEP Tuned. You may have to register before you can post: click the register link above to proceed. The fact they've set your base Idle to 748rpm in Drive and Neutral, but minimum idle to 858rpm will definitely get things to play against each other. Back then we bought a brand new pump machine which we are still using today. So, having an engine that performs well, can save you a bundle of money. There will be 1. Discussion Starter · #1 · Oct 5, 2007. agreif said: 2011 Equinox that will try and surge forward and back (with associated change in engine speed), like you are on and off the gas, while in D, on the brakes, and at a stop. Discussion Starter · #1 · Aug 22, 2012. 92 eighth @ 116 with a 1. If the idle is too high try adjusting into spec first. The IAC is a stepper motor. while the engine is running. And the IAC gets gummed up from time to time. 0L Coyote (cams, intake, supercharged, E-85/C-85 fuel) 2011 Ford Mustang V6 2008 Ford FR500S (cams, manifold) 2014 Ford Fiesta ST (E-85) Dodge: 2009 Dodge Viper SRT10 (bolt-ons and race fuel) Now start the engine and set the idle speed to around 850 rpm with the idle-speed screw. RMF fixed, exhaust leaks fixed, 60 psi, external regulator, 500 miles of Learn applied (several times - manual smooth), Sniper starting to run well. When its idling its got a pretty good shake to the engine. The bike: 2004 FXDLI 95" conversion. Posted - 02/19/2018 : 7:12:27 PM. 5L (w/o GTDI), 3. Veteran Member. Granted, an uneven idle condition can be found in many different engines. Idle RPM Max: Maximum allowed idle speed. It will be idling at 650, set the park brake then immediately goes under load or bogs down to about 600 for maybe 1/4-1/2 second then let’s go and idles up to 700 then the process . Get a small nail and slightly crimp the female side of the connectors, this will help tighten the connectons. 73' 240z 270/280 460 lift cam-haltec f9 programable fuel injection-crane adjustable timing . 96 @ 133 MPH, 1. Gen IV E38/E67 Idle control. 5,712 Posts. take off flywheel cover (5mins and 3 bolts), jam flywheel with the stock tire jack handle. This dip in RPM happens every 5 seconds like clockwork. Discussion Starter · #1 · Jun 25, 2010. • MAF connector loose/intermittent . Check to see that the choke step up idle speed cam is not catching and holding the b'flys open. Shut the engine OFF. Stock bottom end. . =) Horse power is horse crap. What happens is low timing makes you turn up the idle screw to get the idle rpm to the right level. Hemi 5. When the car has a faulty coil, it will experience a rough idle, misfire, loss of power, trouble accelerating, and poor fuel economy. E. The idle chop is usually a nice lean idle but some cars can't idle lean and will start to wander/surge, which it sounds like yours is. Joined Mar 31, 2006. 6/1 with a high overlap cam surging a bit on the smallblock car, 14. I tried to adjust the idle rpm in park with my predator and after installing the new idle tune it wont change. 030 over, cam- . Clean the throttle body, also the pcv valve. I have followed many threads and created an alternative tune that starts . When I ran my 383 with 305 heads and a 215/215 @ . #7 · Apr 25, 2012. 478 Posts. This will make the engine just a touch leaner at idle but still retain high manifold vacuum. some of it has to do with the cam, but most of it has . The IAC can't react quick enough to a lopey cam induced RPM fluctuation so instead of dampening the surge it increases it. Some things you've probably already done : An engine or motor surge is caused by an imbalance in the computer system which cannot be corrected within the parameters of the vehicle's operating program, in other words there is a mechanical problem. Sounds like A hot rod with a big cam. If you push it out to the 25°-30° range, disconnect the vacuum advance and test drive. 88-93 small and big blocks need 9-12 psi. 0 into my 1990 f-150 in place of the original 5. If I lean into it a little bit it accelerates fine and smooths out - likewise at highway cruising speeds - 3000 to 3500 rpm. Joined Dec 5, 2008. I do not believe there is not a fix yet for this problem, albeit an intermittent one. Depending on your head and quench, full mechanical advance on a tight quench aluminum head at a 36 degree range (give or take 2* ether way. 8:1 on old setup. I just removed my 450 holly and installed a 650 edlebrock on my chevy 350. The computer then commands the idle air control valve to open to the . I have a good feel for how to tune the idle well (been reading lots of tutorials and howtos), but one thing that is not touched on specifically is target idle timing. mfire23doc said: Thanks for the response. Put dielectric grease on the male side of the connectors. 68 Camaro, E85 powered 427" small block. I get to a red light, A\C on, the idle gets slightly rough, Revs start surging up and down like the car is going to die but does not. Engine. It is common for the pressure head were the shut-down solinoid and the injection line comes out of to crack at fittings or the o-ring were it mounts to the pump to leak and pull air. Messages: 588. The cam is definitely bigger than stock, but it's not a "big" cam. Otherwise it' a shot in the dark each time you move the screw. 16 Posts. 050" cam on 112 LSA. On the 4A-GE and 4A-GZE This is approx 1600 RPM. With the HP carb you should have a good enough idle circuit to idle clean at the higher speed. Perfect, lumpy, not boggy! Idle Setting Procedure I'm trying to tune the engine in my '30 coupe so I can finally drive the thing. Feb 9, 2009. Bleed fuel system and check for suction leaks. ) Vacuum leaks - locate & replace leaky gaskets & hoses. Joined Sep 3, 2006. The most serious result of incorrect valve lash adjustment is damage to the valves and related components. There isn't any mandate that 4 corner idle have every idle screw adjusted the same number of turns, simply dial them back to give the engine what it wants. I gave it a little gas, but couldn't give it much because. A booster can wont raise vacuum, it merely gives more volume, so they're a waste of time for low vacuum situation. The surge is from normal idle speed, and drops down, sometimes to the point of almost stalling. o2 sensors ground at the same location as the pcm power grounds, that should tell you something. 050" duration cam I was pulling near 20" of vacuum at idle in park and probably around 15-16" at idle in gear. Its specs are 233/250 . May 24, 2009. If the RPMs hit this limit while the idle circuit is tripped the ECU will cut fuel until the RPMs drop to an acceptable level. I'll see what I can find on it. 595" 113+5. There's a crater in the Base Fuel Table at . 3 Idle Surge. so the first thing a guy does is turn the idle up until it smooths out. 065 or so. twhit17 said: I had my tuner do a dyno tune for my new cam (228/232 600/612 111lsa). On the 27th my 95 is going to Fastmotor sports to be dynoed on the mustang dyno because i am having the same problem they r also burning a chip for me , i have the B303 cam which came with may 345hp ford racing crate engine , MSD ignition , 70mm tb , 73mm maf rpm jr upper and lower intake , new tps and iac , 410 gears , flowmaster exhaust with off road h-pipe and BBK adj fuel pressure reg . 050 . Do this on the complete assembly. 496"/. Jan 23, 2016. Engine should idle as slow as it will smoothly to set the mixture screws, say 600 for a stock cammed engine. When I'm driving my power front disc brakes work good until I slow for a stop light and my car idles down, I can feel my brakes go away. Is this surge in the idle NORMAL or is it a sign of possible intake leak. Just wanted to get some thoughts before I bolt it all down. Engine Surges at Idle. Then play with the fuel @ 12 and 18 . Go back to your original stock tune file and make these changes. 584. 2,344 Posts. Plenty of members here are running the next step ( XE 274 ? ) up on a stock converter. A big cam will not idle as well. This seems to get worse when the engine heats . About a month ago I had the transmission flushed at the local dealer so the fluids are fresh. 262. This switch tells the ECU the car is idling and to behave as such. So I have a 400 big cam, starts in the cold like a 400, smokes like a locamotive if cold, wicked touchy mid throttle, truck jerks bad at times mid throttle, you have to drive full throttle or no throttle to drive smoothly, loaded it's a little better. High Idle Disable RPM: If RPM exceeds this value, high idle will be disabled. You put it in neutral and it goes away. Open loop ignores some of the sensors and the computer uses data from a fixed table. 495" lift. Technically ANY cam will do that if the timing is too high, but it's common with "big" cams. Run a wire from the pcm ground stud to the neg battery terminal and post back. 5 powervalve. A #5 would kill it with an in-experienced driver. Positive changes add vacuum, so shoot for the highest vacuum reading attainable with the engine in Park or Neutral. In respect to this, what causes a cam to lope? Lope is a result of the intake and exhaust valves both being open at the same time. The motor is in a 1970 C10 pickup truck. and rich. if the engine drops under 1000rpms it sputters out, in park. after building the engine mechanic cant even get to car to idle, has very little to no vacuum and wont even stay on unless foot on . Carl. The entire truck began to shake and the engine sounded like it was on the verge of dying. LT headers, catless x-pipe through mufflers. These Ultra XP carbs come in 600, 650, 750, 850, and 950 cfm sizes. 3. This one was a nightmare. Note that these idle speeds are for the engine idling at normal operating temperature. Also surges when I let off the throttle coming to a stop sign. I'm retired Air Force and son's Navy. - ive swapped a 95 mustang H. 134 Posts. So here's what's going on with it. I have a mild cam. 2 5S-FE, Auto, 261K. 578" Duration: 284°/296° RPM Range: 2300-6500 | JEGS. In general cam surge, aka cam chug, aka "fish-biting", is caused by too much timing at too low of an rpm. Adjust the engine low idle speed between 600 and 800 rpm. Performance engines with big cams often need more timing at low speed to improve idle quality. Proceed until all valves and injectors are set. 71mph w/1. com Member Today! In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. LesterC. Somedays it rock steady, other days it surges like it has the worlds biggest cam, somedays it surges and stalls. For me, I had to unplug 3 injectors to get it to drop to about 850. 1995 Camry Wagon LE. I had a code “P3497” pop up a few weeks ago, I changed the oil and it went out. Consequently, even one hour of diagnostic time at your local . Discussion Starter · #15 · Nov 13, 2003. 2009 - 2014 Ford F150 - Rough idle/chatter/shake 5. 42 sixty breaking beams with back tire on the bottle. Idle is normally about 500ish on an 03 truck. The limit on a stock stall would generally be around the 220/220 cam size mark so a CAM the size of that would probably be causing noticable hunting with the stock stall . I love it and it put down 429 rwhp. You can see how it's a bit smoother at the beginning and then starts to waver up and down (as does the MAP). But when ever I come to a stop and set park brake it’ll start “surging” or “erratically idle” going from 600 to 700rpm. Also go to IKnow topics and search surge at idle. If you have a Surging idle on Honda, read this post. 574" /. Denville NJ. Leaving me wondering if I’ll have to reinstall the carb. Therefore, a engine misfire code may occur; when your engine is idling, causing a rough or uneven idle. I have a 2015 cruze, Manual transmission, 4500 KM's, trifecta tuned, K & N filter. The service bulletin only applies to these engines: 2. Similar to Fords idle bypass plate without the cobbled look. 0L, 3. Please help me with a few pointers and observations. To get it to idle. COMP CAMS – 'Xtreme Energy' XE284H Hydraulic Flat Tappet MS-COM 11-250-3 SN# VW4520-13. Goes lean for a split sec and then the ecu dumps a bunch of fuel and bogs bad. I've got a pretty tall cam in my 396 stroker. If your camshaft is really that big, it will like the high initial timing. The rpm surging also happens when I try to raise the window when it is already at the top position or turn on the AC, xenon or heat seating (basically any big electrical consumer) in idle. Too much idle fuel, that cam doesn't need a carb with four corner idle. Engines involved that have low idle or fluctuating idle. I have a 2014 Passat 1. 2D maps. Honestly I couldn't tell you with so little info. Heads and pistons were cleaned, new rings, valve job, new lifters and rocker arm bushings, and had all cam bearings replaced. If the short duration cam only has a [email protected] of 230 degrees, and the the cam with the 112 LSA has a 270 [email protected] than the bigger cam (the 270 [email protected] cam) will cause the rougher idle. The new idle fuel number is now the starting point for your fuel table. Everything tuned well except I have a surging at idle (400-500 RPM), and if if push clutch in quickly on deceleration it will stall coming to a stop. 94 and 95 was the higher fuel pressure motors. Aug 11, 2014. with not modifications or other work done to the engine except the recall fixes that have come out. Th400. Here's a quick synopsis of the steps that will get it running. I like the sound of the surge, but it is a little harder to drive, due to stoplight breaking. Slightly less comp (9. The problem may involve an annoying change (up/down) of engine speed while cruising at a steady pace, a low drop (or even cut-out) at idle or when approaching a stop, a wild high engine speed of several thousand rpm followed by a drop to near zero, etc. 97 Vette big cam idle surge (first post to forum too ) Engine specs are 11. Sometimes it does stall. Once off idle or past 1200-1300 RPM idle, it runs well. I have the following mods done: K&N Typhoon intake ported throttle body Underdrive pulley Adjustable cam gears set at 0 Magnaflow exhaust Big 3 grounding kit Centerforce clutch A wide variety of issues can prompt an engine surge. I measured the original hole size of the air bleed and it was around 0. Then turn each screw in (lean) about roughly 1/32-inch. and that'd be if it's tuned WELL. see my sig for 1/8th & 1/4 Perf 2. being strong has nothing to do with it. I have cfm tech's fuel pressure adapter just behind the tbi. If I plug the truck in at night I can . Those are usually idle problems. I tested my vacuum at idle and I'm pulling 10 inches. Joined Sep 5, 2014. I thought the egr leaking might have something to do with it. I also keep getting a P0411 that I have to check out (been an issue before the surging). Tuner's idle was set around 850 in P/N which runs great and has good cam lope sound. Since this also increases hydrocarbon emissions, during the ’70s, the OE’s moved to ported vacuum advance that only added timing above idle. The fuel lines are good. That's more likely than fuel pump, as the carb doesn't operate on fuel pressure like fuel injection, but on a pool of fuel in the fuel bowl. ·. Set the injector and valves on cylinder #1 or #6 as required. I have 2001 Frontier 2WD with the 2. Same tune. Couple months ago had the car dyno tuned . Ignition timing set everywhere from 16-18' at Idle, to 30' or so at idle. HiGhDRo said: sbc350 out of a 72 stingray. It did not happen all of the time, but even it happened only once during a drive was too much in my opinion. 5mm clearance with the exhaust center advanced to 112degrees. at first i suspected the TPS (it didnt. 496" lift 236*@. Isky Mega 280 cam (485 lift/280 duration) it holds about 15 vacuum at idle. Yeah, it wasn't as quick off the line, but it idled fine for a cam that big. Remove pump. 98v and reset the computer and start it up. I installed the ProFlo 4, I'm about 11. Please read this document carefully and use at own risk! Idle speed setting . Adjust your carb and distributor. 050 106 LSA. Posts. Increase the ignition timing at idle to 25°-30° BTDC. 145. Start it up, if the idle is to low then turn the screw in until it is just right, then readjust the TPS voltage to . Overlap causes misfires at idle and that makes the lope or choppy idle. 1987 - 1996 F150 - surging idle. After the completion of Project Punisher Goat, I was having some issues with idle surging. I have checked for vacuum leaks and found none. The idle stop screw touches at idle but when it increase it clearly comes off the rest slightly. its very rough at 1000 the higher i go towards 1500 it . I've run a cam that big with a stock converter and didn't have an issue. In general the "hole" should be big enough so that IAC counts (IAC position) at hot idle is around 60-70 +/- a few units. This is approx 1600 RPM. As expected, partially blocking the air bleed made it richer at idle. Open up the holes in the baseplate (or leave as-is if they are already ~. Joined Feb 27, 2009. 5" vacuum with my engine on carburetor. I have stage one injectors from full force diesel single shots replace the IPR twice cam sensor twice new injector driver new PCM checked and rechecked all O-rings on all injectors buzz tested my injectors checked . Highway cruise is around 48*, idle is 36*. It’s prone mostly to V8s that are force-fed with a large Roots-style supercharger. 7 LS1 GMC. Of course now the warm up table will be skewed by the amount (more or less?) that .


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