Question about 2002 GMC Sierra 1500

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2002 gmc sierra 4x4 1500 \r\nstarts well in the

2002 gmc sierra 4x4 1500 starts well in the morning but revs up then drops off and stays on the verge of dying sounding very rough. Runs fine after warming up. I have changed Fuel Pump and Filter; Air Filter; Mass air flow sensor; plugs and plug wires, full pressure sensor

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All fuel injection cars have an Idle Air Control Valve. The purpose of these are to maintain a steady idle and to compensate for loads that are applied like turning the steering wheel or turning on the blower or AC. .
When they fail the symptom is always a low idle or dies at idle.

If you have no codes in memory and low idle is the only problem then this is what we always replace.

Just be sure the throttle body is not gummed up. You can clean inside with a toothbrush around the throttle plate and in the venturi.

Posted on Feb 07, 2010


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the pump is in the gas tank siphon the gas out and remove the straps holding the tank(you will also need to remove the three screws holding the filler neck to the truck box under the filler door.)as you drop the tank you will also need to unplug the wiring to the top of the tank and the fuel lines they are usually plastic clips,but if this has been done before and the clips got broken from the first time they could have put clamps in place of the clips.I have found it much faster to remove the truck box itself and that way you don't have to drain the tank and it stays stationary while you RandR the pump with less chance of breaking anything.
Also did you double check the fuel pump relay under the hood in the relay box,I would start there first.
Hope this helps good luck.

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