90RunnerRed

Well I searched and I think I have the procedure down to perform the compression test, but the only question I still have is whether or not you need to disconnect the fuel line? Any help would be appreciated, thanks!

Starfury

No, you shouldn't have to. You should disconnect the coil wire, though.

90RunnerRed

Thanks! From what I found you run the engine to operating temperature, shut off, disconnect the coil wire, remove all spark plugs, hold the throttle wide open and crank the engine until you get a max pressure. Anything else I'm forgetting?

Starfury

You want to count the number of cycles it takes to reach max pressure as well. Ideally you should hit it at 2-3 cycles with a stock cam.

90RunnerRed

Humm, I didn't think about that, makes sense. Thanks.

90RunnerRed

Well I have one cylinder that is around 60 psi, I've yet to do the teaspoon of oil test. I really wasn't expecting this, the engine runs strong, no smoke, oil looks clean (no metal).

65Coupester

60 PSI is terrible. Make sure your gauge is properly seated. Hope your not using the press in type.

boots6868

one lame cylinder is hard to pick out in a v/8, oil test is probably gonna show you a bad valve.

Starfury

I agree, that's odd. What are the other cylinders at?

90RunnerRed

The other cylinders are all around 130-140 psi. Yes, I am using the press in type, I know I know, not the best method, but it's what I've got. When I perform the test on that cylinder there is a definite sound difference. I am afraid it is a bad valve as well.