my 1992 chevy lumina car, has a knocking noisy coming from the the engine. it sound...

  • Thread starter Thread starter John H
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John H

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...like a loud muffler.......? i checked the exhaust system there is no holes or loose screws. i took the cover off and all the tappets are tight and not loose. i put in a good octane gas and the problem still there.
will some senor or something cause it to make noisy or loose power?
 
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