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International Automotive Technicians Network
Re: A P0300, and a DRIVE BELT?! you're not gonna believe this but,
Posted to Technical Discussion Forum on 12/1/2002

This one came in Friday. 1998 Subaru Forester, Mil and vibration. Code P030X. Crankshaft bolt was loose (removed it with fingers), woodruff key hammered away, inside of harmonic balancer hammered away.

Mechanical damage causeing rpm fluctuations.

Timing be... Login to read more.