Question about 2002 GMC Envoy
I have a 2002 GMC Envoy that has had several problems in the past three months. I’ll be at a stop light and the RPM jumps up to 1200 then down to 400 then up to 1000 then down to 200 and then it finally stalls. I can be at a stop light and the car will **** forward which causes me to apply more pressure on the brake. Then I notice the RPM jumps up to 900 – 1200 as if the gas pedal is being pushed on. It continues to do this until I turn the ignition off. Sometimes when I coast in traffic and then press on the gas, the car hesitates for a second and sort of jerks forward.
It's been hard for my mechanic to diagnose the problem as the service engine light doesn't always come on. When it does, I take it to the shop and the mechanics fix the problems associated with the errors. I've had the throttle body cleaned, new air filter, new fuel filter along with a flush of the fuel lines, new spark plugs, as well as a tune-up.
After all this work, the car ran fine for a few days then all of a sudden the same problems have crept up again. The service engine light came on after the car was restarted due to a stall but then went out by the next morning. I'm tired of taking my car to the shop every week. What can be causing these problems?
I had problems with the idle and with the car stalling and found that it was a failed oxygen sensor. I replaced it and the car runs great now.
Posted on Oct 09, 2008
Take to dealer for pcm update
Posted on Sep 13, 2008
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Posted on Jan 02, 2017
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