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What would cause a van to run rough under throttle but won't trigger a service engine light

1993 GMC G2500 5.7 TBI

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  • GMC Master
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Lots. Clogged air or fuel filter, low fuel pressure,tune up,dirty throttle body, Idle air control motor dirty, or timing out a bit.

Posted on Dec 17, 2016

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Posted on Jan 02, 2017

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Suburban 1993 2500 -454 / It runs rough on start up and then leans out and then the motor idles faster. It ran fine up until yesterday when my wife could not start it. Could it be a O2 sensor or fuel...


By "throttle body carb" I am assuming you to mean that the engine is equipped with Throttle Body Injection (TBI). The O2 sensors on that engine do not even start working for about 5 minutes. They are not going to cause a problem on start-up. A fuel filter will most likely not cause a problem on start-up or idle either. A fuel filter is most likely to cause problems on acceleration or when pulling a hill. A more likely cause would be a n Engine Coolant Temperature (ECT) sensor. If one of these is reading too low, it will cause the engine to flood and smoke black out the exhaust - especially on start-up. (LIke a choke sticking on an old carbureted engine.) If your truck is equipped with a gauge, there may be 2 Coolant sensors. One for the gauge and one for the computer. If you replace it, make sure you are replacing the sensor for the computer.

Feb 27, 2011 | 1991 Chevrolet K2500

2 Answers

I have a 1988 5.7 gmc that after start up idles fine runs stromg under full throttle but at highway speed and under no load speed it sputters and at slow speed it is running rich i have done complete...


I have a 1988 5.7 gmc that after start up idles fine runs strong under full throttle but at highway speed and under no load speed it sputters and at slow speed it is running rich i have done complete tune up rebuilt the tbi One concern i have is someone removed stock air cleaner system and the one they installed has no intake air sensor could this be the problem ?
IT CERTAINLY CAN BE THE PROBLEM. The air flow sensor if a VITAL part of your fuel delivery and emmision's system. Your mixture is controlled by a computer that uses the sensor data from that device. If you possibly can get the old one, put it back on. It is possible that I may not be totally right about this point but the operation of your engine is dependent on all the parts being there.
and also i have no codes and no ck engine light on.
There may not be code for a missing part. That system is not perfect.
I hope this helps,
Happy New Year,
Mark

Jan 03, 2011 | 1988 GMC C1500

1 Answer

93 gmc sierra running rich no computer codes


Oxygen sensor[s],map sensor and fuel pressure regulator.Although you should have a check engine light "on" with any sensor malfunction.I would look at fuel lines for a leak under vehicle.

Apr 17, 2010 | 1993 GMC Sierra

1 Answer

4.3 TBi code Z cuts out at idle. Please Help!!


Try cleaning the IAC VALVE in the opening in the throttle body with throttle body cleaner,clean well or replace IAC VALVE ( idle air control ) .

Mar 27, 2010 | 1992 GMC Jimmy

1 Answer

Runs rough. Plugs, wires, cap, rotor, timing all accounted for. Fuel filter replaced but not stopped up. No trouble codes. So, assuming all sensors working properly. Fuel leaks over the top of the one...


Two problems. First fix the leaking injector o'ring. And when you have the tbi off doing that check to see if the gasket under the tbi is blown out causing the high idle.

Aug 12, 2009 | GMC Jimmy Cars & Trucks

4 Answers

Runs extremly rough at idle runs great at speed


IDLE POSITION CENSOR IT IS ON THE OUTSIDE ONTHE SIDE OF YOUR TBI DISCONNECT THE WIRING IF THE IDLE SMOOTHS OUT IT IS YOUR PROBLEM IF YOU LEAVE IT UNPLUGED IT WILL RUN FINE BUT YOU WILL HAVE A CHECK ENGINE LIGHT

Jun 24, 2009 | 1994 GMC Sierra

1 Answer

Runs rough and engine light comes on


coil packs are very common on that car.
if 2 cylinders are misfire ,one pack is bad.
get a tune up,change the fuel filter and clean the throttle body,put an additive in the fuel to clean the injectors,.
if there is problems,get a scan doneto see what code is triggering the engine light.

May 28, 2009 | 1993 Oldsmobile Cutlass Ciera

1 Answer

1993 chevrolet apv van


Check the idle sensor . Have your van scanned at autozone. they do it for free.I hope this info works for you.

Nov 03, 2008 | 2001 GMC Jimmy

2 Answers

1997 GMC Savana - Car "stutters" when on incline or warmed up


their are a multitude of reasons the majority or the usual suspects are - if any codes have read and most auto stores offer this service for free --needs tune up ---egr valve carboned or failing --fuel pump /filter failing or partial clogging --catylic converter failing or clogging --injectors- tbi needs replacement or rebuild-- bad fuel any of these can cause such problems and not set off the check engine light

Apr 16, 2017 | 2004 GMC Savana

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