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Re: spark plugs Posted by Ari [Email] ![]() ![]() In Reply to: spark plugs, wrs, Tue, 4 Sep 2001 09:57:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
If the spark plugs are black (I assume you meant carbon, not cabin), the engine is running rich. It could be a bad Air Mass Meter (AMM), bad O2 sensor, or bad fuel pressure regulator (FPR). The AMM isn't adjustable in your model, so the only way to check is to swap it for a known good one. The FPR can be checked with a pressure gauge.
If the O2 sensor or AMM were really out of whack, I'd expect a Check Engine light. Sounds like you're running slightly rich. If you can get to a Saab mechanic, they can read out engine codes (if any) which may help.
posted by 140.157....
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