Question about 2001 Chevrolet Metro
Getting a loud tapping noise more noticable at speeds above 40,sounds like lifters,gets quiter when you let off the gas,maybe valve springs?
Check Utube for lifter tap, valve tap, and rod bearing noise. If you pull each spark plug one at a time, plugging it back in after each one, the tapping will go away if it's a rod bearing. At any rate, on your next oil change add some valve-medic or similar additive for valve noise. Make sure you follow direction or you will get massive lifter tap if you pour it into a cold engine.
Posted on Oct 29, 2008
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Posted on Jan 02, 2017
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