Question about GMC Safari

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Rough idol. O2 sensor and ECM have been replaced. Running rich. Black smoke. Won't pass emissions.

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There is a Temp sensor for the computer that tells the Motor what the Temp is of the engine and when they do decide to take the big nap. It usually is that sensor remember to ask the temp switch that operates the computer control Not your temp Gauge. There are two so make sure you get that one, Alright that should get you going I just had the same problem on a chevy, Its tell the engine its is well below operating temp, It probably always starts good when it has sat all night or its cold out and then after its run for awhile it starts acting up missing running extremely rich and burning black smoke, I sure hope that helps you out a 15.00 dollar sensor can sure mess up your hole day,

Posted on Jul 30, 2008

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I had the same problem on my 2001 Sunfire (same car as the Cavalier-different branding) which I was able to fix successfully.

My symptoms were:
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I simply replaced the O2 sensor (it took me 10 minutes). I did not reset the check engine light after the repair as I wanted to see what the car would do on its own. The idle was much smoother with no smoke and the cooling fan stopped running unnecessarily. After 1/2 mile down the road, the Trac light went away and the system functioned normally. I tested this by trying to accelerate quickly up a snowy driveway. I also noticed that the acceleration and shifting (auto tranny) were smoother. I reset the check engine light. All is satisfactory.


What was happening to the car before the repair:

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