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Old 01-05-2010, 11:39 PM   #9
the misanthropist
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Join Date: May 2002
Location: a house
Posts: 6,243
Originally Posted by parm View Post
Sounds like oil not getting to one of the lifters at idle
This. Could be a bad lifter, clogged passage or a dying oil pump. Could be worth trying different grades of oil, not sure which though. A thinner oil would get through clogs easier but thicker oil would make it easier to maintain higher pressure and stay in the lifter easier.
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