Question about 2002 GMC Sierra 1500
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
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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Posted on Jan 02, 2017
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