350 tbi rough idle in gear

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Off-Road Forums & Discussion Groups > Chevy and GM > GM Standard IFS Trucks & SUV's > 93 350 TBI Acting ... My truck when in Gear has low idle around 400 and when at ... 94 chevy k1500 350 tbi: in the morning when it is cold i start my truck and it runs rough with engine shaking and sometime dies. but after a couple of mins it straitens out and runs great however it is running rich and im only getting 8 mpg. was throwing code 33 so i replaced the map sensor with a new one. did not fix the problem and now throws codes 33 and 34 even after 3 different map ... You failed to say what the idle rpm's are out of gear, and when you put it in gear. The idle vacuum, needs to be more accurate. Not 20 to 25 lbs. It is measured in inches of vacuum. A close to stock engine will have right at 19 inches of vacuum at sea level. expense of low R.P.M. power. A rough idle and lowered intake manifold vacuum are common. Stock, factory torque converters usually will not allow the engine to idle high enough to enter a power band capable of sustaining good idle or of producing good off-idle performance. In these cases we recommend the use of a high stall speed 1985-1992 Throttle Body Injection Wiring Harness Installation. Quality of Construction This harness is constructed using OEM quality wire for superior reliability and long term use. The wire colors are the same as the factory wire colors for car and truck TBI injected engines. Passenger Cars, Mini Vans, SUV Service and Repairs. (No Trucks) - Rough idle on cold weather start - I have a 91 GMC 2WD 350/TBI with 135,000 miles. When outside temp is below around 50 deg, the With the air conditioning Off, adjust the idle stop solenoid screw for a speed of 900 rpm on manual models; 600 rpm for automatics in Drive. Disconnect the idle stop solenoid electrical connector and adjust the idle speed screw (screw resting on lower stop of the cam) for 450 rpm on all 307 cu. in. Jun 01, 2004 · Check out these First Generation 1996-1998 GM Vortec fuel-injected 350 Engine Power Upgrades, including exhaust, throttle body, and more, at Sport Truck Magazine. When my cam cover leaked it caused a rough idle and reduced brake effect. I can't remember if it gave a high idle out of gear or not. I did notice through my ultragauge that the commanded throttle % dropped to 3-4% when it's normally at 11-12% while stopped and in gear. I just noticed you didn't mention a check engine light or any codes. Apr 10, 2018 · 1991 GMC 5.7L TBI - Rough Idle/Stalling. (Let me try again. Data disappeared!) As some of you may recall, original problem was a Code 42 that was finally tracked down to a faulty Ignition Control Module that had less than 4500 miles on it. Replaced the module The code 42 was removed and no other Codes have become apparent. GearHead EFI Forums > Fuel Injection > GM EFI Systems > Intermittent very hard start and rough idle when cold - '90 350 tbi PDA View Full Version : Intermittent very hard start and rough idle when cold - '90 350 tbi PCM 351W running super rich, barely idles, runs rough suddenly. If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. Removing Idle Stop Cap from a GM TBI and Adjusting the Idle Set Screw For whatever reason you have determined that you need to adjust your base idle on your GM TBI vehicle. In most cases this is only done if you have modified the internals of your engine or you have swapped a larger throttle body onto your vehicle. Rough Idle/Sputtering Acceleration 06-23-2011 11:20 AM #1 Of late, my '09 2.0T CC has been experiencing increased rough idle (used to be only occasionally) and a sputtering feel while accelerating or holding steady at rpms up to about 4k. With the air conditioning Off, adjust the idle stop solenoid screw for a speed of 900 rpm on manual models; 600 rpm for automatics in Drive. Disconnect the idle stop solenoid electrical connector and adjust the idle speed screw (screw resting on lower stop of the cam) for 450 rpm on all 307 cu. in. 1985-92 TPI Set Timing and Idle Procedure: SET TIMING 1 Use standard, accepted procedure to confirm Top Dead Center (TDC) of #1 piston agrees with 0 on timing mark. 2 Disconnect Timing Jumper at distributor (Tan wire with Black stripe). 3 Start and idle the engine until coolant reaches normal operating temperature. Re: Chevy Caprice Classic - Rough Idle, Dies in Gear 07/29/2009 11:32 AM I want to thank each and everyone of you for taking the time to send me your input I'm going to start at the top and work my way down and I most certainly will let you know the outcome. May 01, 2011 · I put the TBI on the 350 with an edelbrock in take and a adaptor plate to put the TBI on the 4 barrel in take. right now everything is hooked up except the O2 sensor and it starts fine and idles but if you give it some gas or just start to go it runs like crap. almost dies. but if I give it full throttle it runs pretty strong. but when you get ... 1985-1992 Throttle Body Injection Wiring Harness Installation. Quality of Construction This harness is constructed using OEM quality wire for superior reliability and long term use. The wire colors are the same as the factory wire colors for car and truck TBI injected engines. Rev the engine in park to 4000RPM for 30 seconds. After 30 seconds at 4000RPM, bump the revs a bit higher and let them fall back to idle. Note any rough running or misfiring. If you have a scantool or code reader look out for codes P0301, P0302, P0303, P0304, P0305,... Open and Closed Loop The VCM fueling generally operates in one of three modes: 1) Open loop, 2) Open loop STFT or 3) Closed Loop. Open loop is used when the O2 sensors are not warmed up, failed, or when an enrichment mode (such as power enrichment) is active. Buy Chevy SBC 350 5.7L HP Stage 4 480/480 Camshaft Install Kit 1987-1995 TBI MC1993: Automotive - Amazon.com FREE DELIVERY possible on eligible purchases hey my 03 silverado 5.3 v8 gas has a very rough idle, and stalls at low manuver speeds like turning at low speed or backing up. the tach read 0 yes zero and below, llights are dim and driving my tach reads normal untill i slow down the the problem reoccurs. at idle the voltage goes from 12 to 14 just bouncing around , i tryed the the MAF sensor cleaning and it helped somewhat i have already ... 04-05-08 11:19 AM - Post# 1404666 1992 Chevy C1500 PU sometimes idles down and stalls at stop light. I've replace oxygen sensor, throttle body injectors, fuel regulator, idle control valve, dist cap, dist module, rotor button, pick up coil, thermostat, and new coil. So I asked about last fill up and it was a couple of days ago, so we have fuel in the tank. I pulled the air cleaner cover off and found no gas coming out, during cranking not familiar with tbi, but with carbs one can see it usually. . I also listened for fuel pump humming and I heard that. An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine's idling rotational speed . In carburetted vehicles a similar device known as an idle speed control actuator is used. Open and Closed Loop The VCM fueling generally operates in one of three modes: 1) Open loop, 2) Open loop STFT or 3) Closed Loop. Open loop is used when the O2 sensors are not warmed up, failed, or when an enrichment mode (such as power enrichment) is active. 1989 Suburban with TBI 350. Milky oil, rough idle, low compression, loosing coolant I'm going to preface this by saying that I work out of town and am not near the truck most of the time. 2001 350 Mecruiser Horizon Running Rich and Rough Idle I have twin 2001 350 Mercruiser MPI Horizons (SN 0L399054/56). These have the upgraded fully closed cooling system due to water ingestion problems pursuit was having in the 2000-2001 models (recall). 1989 Suburban with TBI 350. Milky oil, rough idle, low compression, loosing coolant I'm going to preface this by saying that I work out of town and am not near the truck most of the time. Chevy 3500HD w 454 motor shakes at idle - Getting an insane deal on it. I thought I'd just order a catch all of parts off Amazon prime that it could be and send back what doesn't help. What I've got so far: *IAC valve*MAP sensor*Plugs, wires, cap, rotor*Motor an Aside from the rough idle, the car drives beautifully. The idle fluctuates about 50 RPM while hot and you see the oil pressure gauge moving as well. Anyway, the point of this thread is to ask for recommendations for a fuel injector servicing company. When you connect it right away it's going to idle up. If it does not the vacuum canister is ruptured. Now recheck the timing. It should be 18 to 24 degrees before top dead center. Now idle it down to 700 to 650 RPM and reset the idle mixture screws. Now put it in gear and see if it idles, if not then more than likely it needs a stall converter. Silverado rough idle when warm. Nov 28, 2008 · IDLE TUNING The following is a collection of idle tuning notes, tips ‘n tricks and How-2’s for idle tuning a big cam (or any cam for that matter) that I used when dialing in my 248/254, . Any ideas? 89 IROC 350 TPI, idle surging up and down after coming to a stop light. May 08, 2017 · Doesn't do that any more yet if you put your foot to the floor in a gear where you should be down shifting, you can feel it surge a bit. It's very similar to what our 454 TBI did. I think that issue and the rough idle are the same thing. Let me know if the new gaskets fix your issue once you button it back up. Those are next on my list. Chevy 350 Engine - GM Chevrolet 5.7 Liter Motor - Repair Guide & Availability The Chevy 350 engine is the most popular GM engine which can be found on many General Motors automobiles, trucks, pickups (i.e. GMC, Chevrolet). When you connect it right away it's going to idle up. If it does not the vacuum canister is ruptured. Now recheck the timing. It should be 18 to 24 degrees before top dead center. Now idle it down to 700 to 650 RPM and reset the idle mixture screws. Now put it in gear and see if it idles, if not then more than likely it needs a stall converter. General Tech - Bad idle, No power - I have 1988 Chevy G20 with a L05 350 TBI, will start 50% of the time, idle is extremely erratic, it will not stay running most of the time, If i do get in gear and moving it surges and bucks alot, has occasional backfire through the intake when under load or uphill. Apr 19, 2019 · It is because rough idle when warm can either be caused by one faulty component or through series of problems. The Crux Hence, after knowing the ways to troubleshoot rough idle when warm problem, anyone can now keep a check on their vehicle’s status.