imdrax
15+ Year Contributor
- 172
- 1
- Aug 7, 2003
-
napa,
California
Trying to diagnose a newly acquired 99 gsx. The other night when I had the car dropped off I ran a compression test on a completely cold engine, results were 180-30-180-180. Today I started the car and drove it around the block and got it partially warmed up. Ran another compression test and this time got 180-160-180-180. I have NEVER seen such a deviation between a hot and cold compression test. Does this stick out to anyone as a potential result of a certain failure, i.e. HG or valve?