Question about 1983 Cadillac Eldorado

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Mysterious knock from motor

Only has knock when motor it is hot and in gear if car is not in gear or motor is cool noise is not there. it kind of sounds like when you have really bad gas car only has 73000 miles on it and oil is clean as new all the time and it doesnt burn or leak oil, can anyone tell me what this mystery knocking sound is? by the way this is a 4.1 EFI

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The noise is characteristic of this 4.1 liter ht4100 engine. the problem lies in the #1 main bearing clearance. this noise is very common on this engine and will clear up when replacing #1 main bearings but might return after you put some miles on it. i fixed a lot of these as a cadillac tech for many years. good luck!!

Posted on Sep 04, 2009

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Posted on Jan 02, 2017

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