I took a compression reading of 4 random cylinders on my LQ4. Engine warm with throttle blade wide open, I got exactly 165PSI on the 4 cylinders I checked. I checked 1,3,2, and 4. I found it strange that they were all the exact same. Engine has a little over 250K miles on it.

 

Thats pretty damn good compression readings for those miles. Sure your gauge doesn't go by 5's or something and they wur a little off, but you just didn't notice?

 

Sorry, i meant to ask if the readings are decent for an LQ4, i couldnt find the specs for the lq4's. Anyway its the harbor freight gauge, it divided the lines and they each should be 5 psi. Either way they couldnt be more than a couple PSI apart if any. Thanks for the quick response!

 

Yea im sure that is good. Thats right in the range for a bigger performance motor