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

 

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.

 

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)

 

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