Hello everyone yet again. I have an issue on my hands here and could use some input.
Background: Bought the jeep a few months back 128,000 miles on it, it has an HEI and MC2100 on it. A few weeks ago I had a scare about engine detonation from the HEI so I re curved it to keep the curve on the conservative side so I wouldn't destroy my engine. after a lot of playing around I got that under control but the jeep wouldn't idle very smoothly it was up ad down by like 100-150RPMs. Then I got into the big ported vs. manifold debate to try and smooth out my idle/denotation. Didn't work basically just got me confused between ported and manifold vacuum.
ANYWAYS long story short I tried everything (in the way of timing and card adjusting)to get my jeep to idle the way it did when I bought it 3 months ago. I never did check the plugs, until a couple days ago.... My Dad tells me bad set of rings. (I believe him) But what is your take on my plugs? I asked a friend that know quite a bit about jeeps and he said could be stuck valves, a fowling plug. He didn't think anything major engine work was needed because in the 258 usually its either #6 or #1 that have the problems. (but he didn't see the results from my compression test) The plug in the picture is from cylinder #2. Here are the results from my compression test.
As the test shows cylinder 4 seems to have bad rings. (thats my guess I could be wrong) But the compression test shows #2 is right in line with the others. So I'm going to look into why plug #2 is giving me grief.
What do you think of the pressure reading in cylinder #4. Is 65 psi grounds for an engine overhaul? I would rather not but I have a 2000 mile trip the YJs gotta make coming up the end of June.
Thanks for the help