khiz

Hi guys, just wanted to do a compression test on my car so i borrowed a tester from a friend of mine which he bought at 'crappy tire'. Not sure as to how exactly do i do this, can someone please help me out on this...

tesla042

I assume you mean a normal piston engine compression checker.. You won't get precise readings from this, but you can tell a lot.

Pull your EGI fuse, and remove the plug wires from the plugs. Remove one plug (probably top..easier to get to) from the #1 (front) rotor housing. Put your compression tester spark plug thingy in. You also want to remove the "check valve" thing that locks the guage at the highest pressure.

Have a friend crank the car *WHILE FLOORING IT*. You want it floored to get the most air in, to give you a good reading. You'll be looking at the guage. You want to see three EQUAL bounces on the guage. It'll be quick, but you should be able to get the idea. Three equal bounces is good. One high and two low = bad apex seal. Two high and one low = bad side seal. You can sorta guestimate the actual compression numbers from how high the needle bounces, but it's not "precise".

Repeat for #2 (rear) rotor. The rear will likely be slightly less that the front, but that's pretty normal for older engines.

-Tesla