Got strange results on compression test, need help!

[Steve]

I did a compression test on my T-type tonight and I got some pretty strange results. I did one about 2 months ago and all cylinders were between 150-160 psi. Tonight I had one as high as 160 and one as low 90 and a couple that ranged in between. This is a new comp tester, I borrowed a freinds last time, but this one I just bought and this is the first time it has been used. I blew a headgasket on the first GN I had and it read 0 on the compression test, but is is possible to be "somewhat" blown or leaking? Or is the new comp tester the problem, I plan to borrow my freinds and test them back to back. Anyone have any ideas? Thanks Steve

 

[NastyGn]

Originally posted by Steve
but is is possible to be "somewhat" blown or leaking? Or is the new comp tester the problem, I plan to borrow my freinds and test them back to back. Anyone have any ideas? Thanks Steve

Yes I guess you could call it that. Gaskets will start to what I have heard call track, where they are starting to go, or like you said leaking.

I would do another test. This time try a leak down test. A leak down will help tell for sure if you got a valve leaking or a head gasket leaking. If the valve is leaking you will hear the air leaking by into the intake or exhaust (most of the time). That would give you a better idea of what is going on IMOP

Good luck

 

[blackbuick87]

What is the matter with the car? Why are you doing a comp test in the first place?