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Re: service engine light
black plugs usually indicate a rich micture or an oil leak. at least to my knowledge. but do like copper sez, ether take it to the dealership and get it scanned, usually an hour rate for diagnostic. around 80 bucks now, or buy the tool yourself. with computer controled cars, they are worth their weight in gold. i would reccomend having it scanned one way or another before you did anything physical to the car. like ive told many people on here, im a chevy mechanic, and that is always the first thing we do to OBD cars. saves time, money and headaches, and always the worst thing, making the problem worse.
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