Hi there,
You will need to do a few tests, check the valve clearances and check for a broken valve spring, do a comp test and check the oil pressure with a master gauge, you may have to get a mechanic to determine which cylinder is at fault and do a leak down test as this will help detect a cracked piston, start here.
Mark (mhpautos)
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Wednesday, November 12th, 2008 AT 3:21 AM