Hi all...
I have a 1994 pickup with a 22RE with 85,000 miles on it.
I did a compession check and 3 cylinders showed about 180 PSI, and 1 showed about 145. I added some oil the the weak one, and it also got up to about 180 (so I guess its the rings--I do have a valve that taps, but it seems to come from a different cylinder). All of them took 3 or 4 compression stokes to get up to maximum pressure.
The manual says they should be 171 with a minimum of 128. However, I've also read many places that they should all be with 10% of each other.
The engine seems to run fine. It's very smooth, seems to have good power, and, other than a little valve tap, sounds fine. The truck doesn't burn any oil.
Should I be worried about the difference in the compression in the one cylinder?
Thanks.
Stan