Question about 2002 GMC Envoy

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Envoy 2002 unsteady RPM and engine while stoping

I have a problem with my 2002 envoy which I never faced before. The problem is that when I start the engine, it will start smoothly but after a while the RPM is start oscillating up and down and the engine is not stable and when I drive no problem and the RPM is stable and the engine is raunning well, but when I stop for a trafic light, then the RPM start moving up and down and also the engine is not stable as well. I've sent my car for fixing to different places but they are not able to know the reason. The problem appreas only when the car is stopping, While running no problem at all. Please advise

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  • maher_assaf Dec 01, 2008

    Actually, my mechanics finally found that the problem was from the camshaft exhaust sensor which was not working. we changed it, then the car is running fine

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It is your Fan Clutch going. That thing causes all kinds of settings on the computer to readjust as it fails. The fortunate folks that I know that it happened to simply experience a sudden roar of the engine sound,, loss of compression, and just a wide assortment of symptoms. But it was the Fan Clutch. Part only cost about 125 bucks, but after it is installed, a computer download must be performed that is only available from the dearlership. 600 bucks. This should have been a recall item in my opinion,, but.

Posted on Dec 01, 2008

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if its at the top end its pistion slap
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with out going into extream detail,

a ting sound at the top is a pistion slap.... replace all your pistions posibly over hual the engine.

a dubble knock that gose with rpm but sounds 2 knocks very every fireing of the pistion is a crank bearing..... replace your crank shaft bearings.... all of them b/c metal gose threw an engine extreamly fast and will destroy other beraings. this knock on start up will turn into a knock all the time, then a very louad knock that will end your engines life.

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2002 GMC Envoy


If your 2002 gmc envoy or sierra will not even turn over with a kown good battery try starting it in nuetral then go back to park and try starting again. There is a park nuetral safety switch that can malfunction. Turn the key on then shift into nuetral, then turn fully to start.
 

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