Question about 1998 Pontiac Grand Prix
Knocking or tapping inside your engine is generally caused by low oil pressure resulting from worn crankshaft bearings or a large amount of hard carbon plugging the oil pump pickup screen. Timing chain guides or a broken transmission flex plate can also make a noise similar to a larger engine problem. It takes a very experienced tech to differentiate between the actual noise sources and may require that the engine be torn down to pinpoint it. Generally a good repair is very expensive and unless the vehicle is in exceptionally great condition otherwise, usually it is better to get another than to repair the one you have. I can't see or hear the problem so don't give up 'till you get a hands on opinion form a good shop. In this case, I hope I'm wrong!!!
Posted on Sep 09, 2010
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Posted on Jan 02, 2017
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