Question about 1991 Saturn SC

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Rough Idle, and Black exhaust smoke.

My 91 Saturn SC, DOHC, will start and idle ok foe about 1 min. then it "throws a fit" idles real rough, and blows black exhaust smoke. This does not seem to efect the running on the road, but it drinks gas. It will sometimes die, and has to be restarted like it has a carburator, with a stuck choke. I replaced the MAP sensor, but dont want to just throw parts at it. What could cause this prob.. HELP

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  • evilweevil4 Feb 26, 2009

    That fixed the bad idle problem, but now I have a check engine light,and "all" of the dash warning lights come one momentairaly when driveing down the road. I figure the check engine is the oxygen sensor (due to the black smoke), but the other is a quagmire. The engine code reader gives a 1 2 code, but I don't have a book. Any Ideas?

  • Anonymous Mar 18, 2014

    I got a 92 nissan hardbody pick up that idles rough an it smokes black smoke an chokes out an dies

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Coolant temperature sensor boken, check and replace if defective.

Posted on Feb 25, 2009

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