Question about 2004 GMC Envoy

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2004 gmc envoy slt service engine light is on and it vibrates when sitting still almost like shaking could my fuel injection be clogged

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Could be a lot of things. Please get the trouble codes and report them to us for analysis.

Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 24, 2010

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I have a 2004 gmc envoy with a 4.2 motor....it has a slight vibration while at idle but my main concern is why my entire motor and vehicle shakes violenty when i shut the vehicle off.


I think what you might have is called dieseling on shut off. Newer engines run much hotter than older vehicles and require a fuel shut off solenoid close to the engine. If this solenoid goes bad, on vehicle shut off, excess fuel is still being fed to the engine. Even though there is no spark because the key is off, the engine is hot enough to ignite the fuel causing the shake and shudder. I'm not 100% sure of this but thats what it sounds like. If the solenoid is working properly and shuts off the fuel line like it should there is no excessive fuel to ignite. Thus no shake or shudder.

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I backed the 2004 envoy into my driveway and the engine killed and the reduced engine power light came on along with service engine light also. Restarted the engine and had no throttle while in park...


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