YJ diagnosis etc

Ran like shit last time out, lots of codes on the scanner. checked distributer, still looks new from last years big dogs when the cam sensor broke. Distributer cap looks new, no carbon trails and contacts look good.. Checked spark plugs and #1 and #6 were oily and had a crusty buildup. 2-5 looked tan and no buildup.


Did a compression test and found the following:
1- 120# removed and tested again with same result
2 - 180#
3- 180#
4 - 185#
5 - 180#
6 - 170#

Couple years ago they all had about 210-220# compression
Put a teaspoon of oil in the #1 cylinder and tested again with 210# compression.
Waited a few minutes and tested it again with 185# pressure.
Looks like my rings are bad on #1 and wearing out on the rest.
I changed the spark plugs and switched to stock injectors since it has been running rich. Still sounds like a diesel but runs much better without sputtering now. Can the rings be changed from below or should I expect to have to pull the head? I have to change the crank and rod bearings anyway.

i would pull the head and have it decked to make sure its flat

Leak down test?

Locked_N_Loaded wrote:

Leak down test?

Didn't do one. I figured at this point I'm looking at replacing all the bottom end bearings to see if I get better oil pressure and need to pull the head to get the rings changed out. It will be easy to visualize the valves once I remove the head. After swapping the new plugs in the jeep ran much better, not sputtering anymore. stock injectors didn't seem to make much difference yet but I haven't done any full throttle assaults yet either.

Motor runs much better with replacement of the 1st and 6th spark plugs. gonna throw in some 20w50 oil and call it good. Run the crap out of it to force a decision. Aaron might take care of that for me this weekend since he will be driving sunday.

like father .......like son......you can dooooooit