ANY BODY NOW WHAT THE COMPRESSION IS ON A 90 WRANGLER 6CYL, HAD THE HEAD REWORKED WHEN I REPLACED THE EGINE, THE EGINE IS NEW BUT THE HEAD I JUST HAD A VALVE JOB DONE, I CHECKED THE COMPRESSION AND THE #1 CYL HAD 125 ON IT THE REST HAD 65-70 GONNA HAVE A FRIEND TO RE-CHECK IT TO MAKE SURE I AINT THAT CRAZY,,BUT I HAVE HAD NOTHING BUT PROBLEMS SENCE THE RE-BUILD....HOPE I DONT HAVE A BAD EGINE OR HEAD

Coach the 125 is Ok the rest are not. Did you take all the plugs out and hold the carb wide open to test?
If the cyl walls are washed in fuel you might have to squirt a teaspoonfull of oil into each cyl for the rings to get compression. If they are truly that worn that would splain no idle but seemly good running.
I'd guess you'd have an enormous amount of blowby if the rings are that bad.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

THE NEW ENGINE HAS ONLY 325 MILES ON IT...IT IS A NEW ENGINE NOT A RE-MAN....I DONT UNDERSTAND THE 125 AND 60-70 ON 2 THUR 6 IT MAKES NOT SENCE...AND THE READING ON THE OTHER 5CYLS WAS NOT A CONSTANT READING IT WAS BOUNCEING BACK AND FORTH...IT WOULD NOT HOLD A TRUE READING.AND I PUT OIL IN THE CYL...AND IT SEEMED NOT TO HELP THEM AT ALL. THE READING WAS SO IRRATIC

Coach does your pressure gauge not hold the highest pressure till it is released? What do you mean by "boncing back and forth? You need 3 or 4 compression strokes in a row on each cylinder to get the best reading.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

YES IT HOLDS THE HIGEST POINT. ITS LIKE THE NEDDLE BOUNCES ON THE OTHER CYLINDER...BUT WITH THE FIRST ONE IT WAS LIKE IT WAS A SMOOTH CLIMB TILL IT REACHED ABOUT 120 OR SO

Coach would their be ANY chance of the push rods being mismatched? Everything being newly done Who installed the rods, lifters and rockers?
I might just have me a good look under the valve cover.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

I WAS THE ONE WHO INSTALLED THEM, KEPT THEM IN ORDER, PLACED THEM BACK IN THE SAME ORDER THEY CAME OUT, ITS ALMOST DROVE ME TO DRINKING, THEN AGAIN IT MAY TAKE THAT TO FIGURE IT OUT <img src="/forums/images/graemlins/cheers.gif" alt="" />

hmmmm Where did you get the lifters? Is there ANY chance that they are pumping up and holding the valves partly open? Did you get them from MOPAR?
Damn! I wish I had my hands on that engine. I LOVE a challange.
Alls I can think fo is the valves are partly open or perhaps you have already burnt 5 of them! I cannot think of a situation where what you have there is mechanically normal. Pushrods too long will hold them open all the time. The wrong rockers will do the same. Is there any possibility you have BENT 5 or more of your valves?
MAKE sure you know what you are doing when you do a compression check. If you are correct as of this reading you must have a problem unknown to me.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

Sounds like bent valves to me. I had a few bent valves on my prelude. It would run just fine with gas, but would not hold an idle whatsoever.

sounds like a good idea <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />