jiffyjet2

I'm quite aware that there is no "carb" on an MPI system, but it's a lot easier to type "carb" than "throttle body". Everyone seems to have understood what I was getting at. In any case, the Jeep dealer was unable to duplicate the problem, drove it twice and called me to tell me that it was running fine. (It wasn't raining or wet out.) I asked him if they had a car wash at the dealer, he said yes, so I said run it through the car wash. He did and it finally went into the crap mode. The end result is they found the MAP sensor did strange things when it got damp. They replaced it and it really runs great now. We'll see. Thanks for all the advise. Jess

The first time this happened was after going through a car wash. It suddenly lost power, although still running, and was backfiring through the carb, and on deceleration through the exhaust. I babied it along, keeping revs up and it got over it and I drove home, although still idleing rough and backfiring through exhaust. The second time was after sitting out in a long week of rain. It started out ok, then started "bucking" at low speeds then went into the back firing. I stopped look under the hood, which looked dry enough. I considered AAA and having it hauled home, but again, babied it along, it seemed to get over it and got home. Over night and it ran fine, but I took it to a Jeep dealer to check it out. They put a new EGR valve in it, a new O2 sensor, and rotor and cap. Yesterday, it rained again (I'm in Seattle). It started out with the bucking, then went into the same backfiring, snorting and generally running like crap. I got it home, put it in the garage and today it ran fine going back to the Jeep shop. The only connection I can figure out, is there is a leak of some sort that allows water into the cab on the passenger side. The carpet is soaked. It's dry on the Renix side, but is there something behind the glove box that is a critical part of the ignition system that could be getting wet? There's also the thing on the left fender edge that could be getting wet. Any ideas? I don't have a lot of faith that the mechanics at the dealer can find and fix an older Jeep that you can't plug into a computer for diagnosis. Thanks for any advise. Jess '89 Comanche - 4.0 with manual transmission, 145,000 miles

Thanks for info. This forum is absolutely the best resource you could find!

My genuine official 1989 Jeep Comanche Service Manual refers refers to the manual transmissions in the 1989 model as either the BA-10/5 or the AX 5 (which mine has thank goodness) but I notice most on this forum refer to an AX 15. Is that a different gear box than the AX 5? Just curious. Jess

You'd be hard pressed to put a SET of headers on a straight 6. There's only ONE exhaust manifold. Thanks for the insightful comment, nothing like some idiot trying for a laugh when you're trying to get some information.

My '89 MJ, 4.0 with 5 speed short bed, is in need of some exhaust system renovation. I'd really like to put a set of Banks headers on it, but they list their Comanche header for '91 to '92 only. I talked to Banks to find out what the difference is between early 4.0 and later, but they couldn't answer the question. Is there a huge difference between the exhaust on the later engine and the older engine? Could the Banks headers be tweaked to work on my Jeep? The other brand says some modification MAY be necessary too. Any help or advice is gladly appreciated. Jess

Yes, Tacoma Washington. I've had the Jeep for several years. It was a very basic MJ, the only options it had were Jeep alloy wheels and bucket seats of all things. No power anything or A/C. (I suspect it was a former government vehicle) The engine had several leaks (which I hate) so had them all fixed including a new rear seal. While it was apart had a new clutch put in and a new radiator and header tank. Added the Canyon wheels ($100 on Craig's list) and the rear bumper. I picked up the bedliner at a junk yard and had the stainless bed caps made in Tacoma. Installed a K& N air filter. Interior I put in a console and a new headliner. It's a really nice little Jeep. Cheers, Jess

'89 MJ, my daily driver, 140,000 miles on 4.0 five speed.

Actually, I picked up a used one from somewhere on the internet...and it's sloppier than the one that's in it. I guess I need to figure out a way to rebuild the pivot shaft. New assembly is not available. My clutch and brake pedals are sloppy too, but those parts are easier to deal with. Jess 89 Pioneer short box with factory buckets! 4.0 5 speed

My park brake pedal is loose as a goose. Although the brake works well, when it is applied, any slight movement causes the pedal to realease. It appears the rivet/pivot for the pedal has too much play. Can it be repaired? Has anyone converted the Comanche pedal for a Cherokee hand lever and how involved is it? It seems to me that the hand lever would be more versatile. Thanks Jess