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1999 Nissan Altima Question: When I start my engine I hear 3 taps then the noise stops...

 

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Dr., 2.4L 4 Cylinder, Glendale, AZ, November 20, 2011, 06:27
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The car had a constant tapping sound so I replaced the rod and main barrings. The tapping stopped however, when started from a cold startyou hear three taps and then the sound goes away while the engine is running. What is making the 3 taps when cold start?

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