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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Weird varying compression

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Old Nov 17, 2016 | 07:09 PM
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jordanfs
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Weird varying compression

So in cylinders 1-7 if get 140-150 psi compression.

In cylinder 8 I get 90 psi on the first test, if I doing it again I get 0 psi. If I wait ~10 min I get 60 psi. If I wait a couple hours I get 90 psi again.

This was so weird to me, thought I was doing something wrong but I've repeated several times, pull tester out put back in, etc and I get the same results.

Anyways I figure I'll do a leak test next but wanted to see if I'm crazy or if anyone has any input, thanks.

-Jordan
 
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