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I've had intermittent no-start problems three times on my 91. Two of those times it was a CPS (showed a code 11) and once a coil (showed no codes). And that's about what I've found over the years, you can find ~50% of your start/run problems by reading the OBD1 codes. Not perfect, but better...
^^ This. You're not going to get an OBD1 CEL for this problem. Check for codes.
https://comancheclub.com/topic/28111-reading-obdi-91-and-92-mj-fault-codes/
As others have said, I agree with the use of an on-board AFR and Mopar 195* stat. I had similar cooling problems with overheating several times especially when stuck in traffic on hot days, causing me to pull over and park it until it cooled down My rig is a 91 MJ with a 4.6 Hesco stroker...
The 90-96 XJ AW4 cooler lines are all the same, but the p/n's changed in 97. I don't know exactly why, but I can't imagine they would be that much difference and would swap over easily. The lines are pretty cheap too, of good quality, and are available at Amazon and other outlets.
Dorman Part...
The roll pins are easy to get to and tap out. I have a new Mopar reservoir coming, and am going to try to replace it w/o removing the master cylinder. Bleeding brakes isn't one of my favorite things, and if I can avoid it I will. Will let y'all know how it works out..
Agree. And Autopals are junk too and have a crappy beam pattern. The Hella E-code housings are the best; nice sharp cutoff and have great beam focus where it needs to be.
The plastic tank on my 96 XJ master cylinder needs to be replaced. Replacement reservoirs available from both Mopar and aftermarket. Has anyone done this? Can you pop it off (after removing the brake fluid of course) w/o bleeding the system afterward? I'm thinking yes, since the master cylinder...