DocHoliday

I was hoping someone here could give me a detailed explanation on how to perform a compression test. Or give me a link to a VERY detailed article on how to do one. Please keep in mind that I have never done a test like this before, and I am not taking it to a mechanic so I can learn as much as I can about my engine. Thank you in advance.

Also, I wanted to know exactly what numbers I need to write down when I do the test and which ones go with the different parts they corospond with.

For Example: If a number is low, this is what you need to fix. If its high, this is what you need to do. Etc.

Thanks!

DH

sofakingdom

iTrader: (1)

Charge the battery as charged as you can get it; pull all the plugs; block the throttle wide open; unplug the 12V to the dist, and the plug to the fuel injectors. Hook compression gauge to each cyl; spin motor, maybe 5 compressions on each cyl.

Ideally you want all cyls to come up to pressure in about the same # of pumps, and all the numbers to be within 10psi or so of each other. The actual # itself isn't as important, as how consistent they are. Expect numbers in the 160-190 psi range for a typical factory motor in good shape.

bobdole369

Most importantly - screw the compression gauge into the same hole you just took a spark plug out of....

cylinders are numbered starting with the passenger front, continuing clockwise around the motor, 123456 (driver front is #6)

sofakingdom

iTrader: (1)

Do this first, before putting the gauge in any of them.