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Compression Test: Gauge goes up then slides down, why?
Did a compression test on my 2.4L 4 cylinder vehicle. As I'm cranking the cold-engine, the compression tester gauge would go up to about 165 psi; but as soon as I quit the ignition, the gauge doesn't freeze to a specific value but, slides back down. It did that on all four cylinders. I didn't quite let it go down to zero, but I suspect it would've - cause it kinda did on one - since by the time I got out of the seat to the front of the car it was gliding down past 20 psi.
Sooo... Faulty compression tester (from a store which I won't cite, cause I like 'em) ??
Or
My 1999 pretty car with only 150k is a piece of 'p-a-r-c' ??
the needle in the compression tester could be shot or faulty. maybe a bad O ring??
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