Question about 2000 Chevrolet Astro
I have had a problem with a tapping noise coming from the engine.I replace the bottom end bearings and the oil pump at the same time even though the bearings looked good.The tapping noise went away for about 2 days and then it returned. The other day I noticed that when I put it in neutral the oil pressure would start going up and down with the tapping.Could it be a bad oil pump?
Its possible the oil pump is going bad, but I doubt it would make the noise you describe.
Usually a tapping noise is a valve lifter or a piston connecting rod.
And low oil pressure could cause either, as well as dirt blocking one of the oil passages in the engine block.
Posted on May 09, 2013
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Posted on Jan 02, 2017
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