I just bought a 1989 Cherokee that was going to be a parts truck for my 89 Comanche. The guy that had it said his mechanic told him the timing belt(?) was bad. It wouldn't run very well at normal speeds. He also had to manually shift the AT to get it to change gears. I went to take a look at it and tried to jump start it. It was not getting any fuel to the fuel rail so I offered him $200 bucks for it. After I towed it home I started to see if it would run. If not, it was in great shape for parts. I charged the battery which seems to hold a charge. I checked the fuel pump relay, ballast resistor and wiring and found nothing wrong but still the fuel pump was not working. I "Hot Wired" the pump and it worked fine. Just by chance I decided to put some more fuel in the tank and try again. Guess what.... it started right up. Fuel gage said it had 1/2 tank.
I hooked up the vacuum line to the MAP sensor and attached the transmission wiring harness to the computer and the truck runs great!!!
Not bad for $200 bucks.
The only problem right now is it is stuck in 4WD. That should be any easy fix.
Now I guess I'll give it to one of the kids so they'll stop driving my MJ.
Pat
89 MJ
4.7L