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Old 07-11-2015, 05:18 PM   #14
PC/SR
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Join Date: May 2010
Location: Santa Rosa, CA
Posts: 1,279
Default Re: Low compression in one hole

It could be piston slap, which goes away as the piston warms. You will get oil to the rods immediately on start from the pan tray. A rod knock does not usually go away when warm. Short out the spark plug on the suspected piston and see if the knock goes away.
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