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I have a 87 A/T MJ that whenever I go to put it in drive, it seems as if it is in 3rd gear. It only will move at high RPMs. If I put the truck manually in 1st gear, then it goes fine. I havent checked anything except the inline fuse link on the passenger side located near the TCU and of course...

On my 87 4.0 for some reason my turn signals and Hazard Lights stopped working. The indicators on the dash also stopped. Any ideas or help where to start? Thanks

On my 87 MJ 4.0, I have noticed this violent shaking and wobble whenever I hit a bump going around a curve or sometimes just going around a curve makes it feel like I have a flat tire on both fronts. Does anyone know the cause of this problem?

I was wondering if there was a fuse on the electric cooling fan on a renix system. I have never been able to get my electric fan on my MJ to work, but haven't really needed it since I don't use a.c. But it's warmer than average here and I can't sit at idle for a length of time. I can hook the...

Hi everyone I have a 1987 Jeep Comanche 2wd with the 4.0, and I was wondering if there was a way to upgrade the brakes on these trucks to give it firmer brakes. The brake booster on my truck has a leaking diaphragm every time I hit the brakes you can hear air hissing out and sometimes it seems...

1.)On a 1987 Comanche, can anyone tell me why there is such an annoying whistling noise coming from around the passenger floorboard. This noise only exist when I slide the selector switch for the air and heat to the OFF position. But it will go away when I slide it to VENT. 2.) Also there is...

Can anyone give me a writeup or a link to a writeup for swapping out the evaporator core on an 87 mj. I had one years back but lost it. I do remember the dash doesn't have to come out just slid back but I can't remember where all the bolts and screws are at. Thanks

I have a 1987 Comanche 2wd that I just got new tires for. I wanted to get an alignment but the tire guy said I needed new tie rod ends. Well I've installed all of them except for the right outer. The tie rod end bolt is larger than the hole of the knuckle. The tie rod is identical to the old one...

On my 87 Comanche I am having problems identifying the source of my Freon leak. First thing I did was replaced the compressor with new ester based oil because my old one was froze both clutch and bearing. Then I added my Freon and a can of dye. It leaked out in no time. I opened the hood at...

Does anyone have a writeup on the conversion from the old r12 to 134a. I have a 1987 Jeep Comanche that previously had air in it roughly 10 years ago or so and i am now deciding to fix it. I know i need new fittings for the high and low but can anyone tell me what parts are compatable and what...

I was driving through town yesterday and was headed home and noticed my 87 Comanche started trying to die out. It ran fine the rest of the day and I didn't think no more about it. This morning i went to start it and it to just kept cranking over and over with the relay that is closest to the...

On my 87 MJ i bypassed my heater core back 8 months ago or so. Its beginning to turn colder and i need some advice or tips. Is there a write up on this or can someone explain an easy route to tackle this job. Thanks

Has anyone went with an aftermarket adjustable fpr? Mine in my 87 mj 4.0 died a while back and i actually installed the 746 injectors along with the fpr from a mid 90s volvo.

Can anyone tell me a good place that is switched to wire the hot for a volt gauge/meter. 87 mj 4.0

I know this topic has been covered in many threads but I can't pin point to the right culprit. I have a 88 xj 4.0 that the idle fluctuating on. It will idle normal then drop then go back up. Sometimes when I go to a stop (1/3 times) it will die and I have to start it back up. Also the check...

Last night I rode my 87 comanche 4.0 to town and back with no problems. I woke up this morning and tried to start it, but it just cranks over and spits and sputters like it wants to start but doesn't. I pushed in the valve on the fuel rail and fuel came out. I haven't did any other tests on it...

Has anyone ever tried deleting the egr? The valve in my egr no longer holds? I was wondering if anyone has ever did this and the pros and cons of doing this.

So I finished my engine swap on my 87 mj 4.0 a/t today. Put all the hoses back on the radiator went to start it. It ran fine, but when I put it in gear nothing happened. Won't move in any gear. Is there anything electrical or mechanical I could have forgot. I'm a bit puzzled. Transmission worked...

Can someone please explain the two sensors located on the front to Middle ways on the block on the driver side that are found on the renix era 4.0 engine. I know one is a knock sensor and the other is a temp sensor but what is the purpose of these two sensors and are they mandatory. And also can...

I have a 1987 jeep commanche 4.0 that recently slung a rod. I have pulled the engine already and I'm waiting to put another one in it. I have a 1991 Cherokee Laredo 4.0 that I'm swapping into it. I need to know what gaskets to get and what to swap from my old engine to my new