View Full Version : Compression Test

06-20-2008, 10:04 PM
1990 5sfe-161,000 miles.
I just had it checked, and I'm getting, from #1-#4, 180, 160, 180, 200. I'm wondering if I have a bunch of buildup in that #2 cylinder, because it doesn't seem like I should have that much drop across the four cylinders. Thoughts?

06-20-2008, 10:07 PM
That seams high..... how did you test it? I believe it should be 160-170, but that's just off the top of my head.

06-20-2008, 10:35 PM
??? you should never have more than a 14psi difference between one cylinder and the next. Check again and hope for the best. Readings that have that large of a variance between them usually denotes that there is something very wrong. (ie. rebuild time)

06-20-2008, 11:34 PM
I know there is a lot of buildup in the intake, because I just took the throttle body off and cleaned it completely. It may be time for a rebuild, I just don't want to go down that road yet, if I don't have to do so. I have some B-12 Chemtool in the tank, right now, and I plan on running some down the intake tomorrow.