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Old 08-15-2011, 10:39 AM
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Oldwolf Oldwolf is offline
Join Date: Apr 2009
Location: Raleigh, NC
Posts: 1,017
I know its hard to count the frequency of the tapping, but if it is the same as engine RPM it is crankshaft related and if it is 1/2 engine RPM it is valve train related. Or do I have that backwards?

600 RPM idle will rotate the crankshaft 10 time a second. Your tapping didn't sound like 10 taps a second, it sounds slower than that.
1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L
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