Question about 1997 Buick LeSabre

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97 Buick 3.8

I replaced the plugs and wires twice already,they all look good and were burning white and all of them the same. I checked the codes,no codes. I did notice the overflow container goes down but not that much. The tailpipe is black on the inside. I did not due a compresion test yet.One owner car that I purchased from my mother.I never see any smoke from tailpipe.
etbreezie

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Exhaust tailpipe black on the inside is normal, check if you get white smoke from exhaust when engine is hot that means head gasket problem. If car fail going up an hill it is often a compression problem.
If car has automatic transmission, it can be also tranny not shifting down gear, this usually is a module problem, but you told me you checked this already.
Also a faulty throttle position sensor can give transmission problems, but when this is faulty you get troubles with gears on all situations.

Posted on Aug 12, 2008

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