Question about 1994 Jeep Grand Cherokee

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Carbon emmisions to high to pass inspection

I have the problem of the vehicle shutting down as I am driving that is after the car is warmed up. But my concern at this point is that I cannot pass emmisions and need to figure out what is going on in order to get my tag.

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Want to "cheat" on the emissions thing? Add about 3oz of acetone to the fuel,,, Generally, this will clean it up temporarily. Check your ignition system and LOOK at the spark plugs for fouling etc. Acetone will also help clean the injectors. Is compression and oil consumption normal? Are filters clean? Is spark "hot" ?
I can't be too specific with this answer simply because there are numerous causes for your problem. Since sensors feed off one another, sometimes one thing looks like something else. Therefore, checking all the basicsis important before getting into the more complex stuff.

Posted on Dec 10, 2008


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the drive cycle that is most common to GM vehicles is the following;

1. cold start vehicle and allow to warm up to driving temperature, then set a load on the engine, ie. turn on radio and A/C MAX and headlights.
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