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Old 12-10-2019, 12:27 PM   #12
Jim Brierley
Senior Member
Join Date: Jun 2010
Location: Temecula, CA
Posts: 3,059
Default Re: Compression test and Vacuum test readings need help

It is undoubtedly valves. You can just force compressed air into the spark plug hole and listen for where the air leaks out, likely into the exhaust pipe.
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