Northstar Engines and System Technical Discussion Discussion, Unusual noises or am I crazy? in Cadillac Engine Technical Discussion; My 98 Deville has been acting up lately, I'm led to believe its a bad engine mount. As for codes ...
Is this noise with the engine cold or hot, and does it change as the engine warms up ? How many miles, what oil, filter, last oil change ?? Suddenly appear or slowly become more apparent. Same with engine cover removed ? What does the noise "do" with engine rpm increase ?
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Is there something hitting a cooling fan blade ? (long shot, I know..........)
Just saw this now, will do a proper analysis tomorrow to answer your queries. I can tell you it has 88,983 miles, unsure of oil brand (10w-30), oil changed 5-31-12.
A side note, I did a WOT a few days ago, and i got up to 55mph, switched to gear 2, floored it to about 70, and let go of the gas. as it was coasting back down the car shook pretty heavily. is that normal?
I might have figured out the problem to the knocking. The A/C compressor is nearly on its last leg. I pulled the relay and started the car and bam, knocking is gone. The compressor would also explain why my a/c is no longer cold.