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I had the senior mechanic at the local jeep dealer for things like this. He would hook up the RENIX scan tool and figure out what is wrong. Might be worth it to pay an hour or labor to find out. It could be a variety of things one thing comes to mind is a stopped up Cat converter. I had mine...

it is an easy job. I did it on my 88 XJ. I got the hoses at Car Quest parts store. They were identical to the ones I removed. You should have a set of flare wrenches. I also had to use a pair of vice grips to grasp and break loose the fitting. I have to use metric on one end and english...

With as many miles as you have you may want to consider other things to replace while you have it apart. 1) Fan clutch - you have to remove the fan to do the job. 2) Idle pulleys - they will be easy to replace with the belt off. 3) Fan belt - you have it off, no more labor to install a new one...

This may seem too simple, but did you make sure the fuse for the trans control module is good? The fuse is located next to the module on the lower dash panel between the ash try and the glove box. You may also want to unplug, replug the trans computer just to make the connection "fresh". If...

Go to www.madxj.com and look for the technical article on oil filter upgrade. He has very good pictures on removing and reinstalling the oil filter mount. Once you see those pictures you will be ready to do the job! Also this would be a perfect time to change the motor mount if it is worn...

Makes me thankful I have a Dana 35 non C-clip under my 88 XJ. You don't have to mess with pulling off the diff cover to remove the axle shaft. You just pull the drum, remove the 4 bolts on the retainer plate and pull out the shaft. You then sent the shaft to the machine shop and they will...

YES, you need it. Check your lines again it runs to the intake manifold NOT the exhaust manifold. It is a vacuum reservoir. You can remove it and then wonder why the cruise control does not work and wonder why your vehicle does not shift into 4wd.

Yes, the PF970C has a metric thread. I though I said that by saying I kept my rig stock. I buy mine at O'Reilly Auto parts, it is kept behind the counter and I pay around $6 for the filter. I keep one on hand and then buy the next one after I finish my oil change. They only stock one and...

I have a 88 XJ with the 4.0 and tried to find a larger filter. I found a corvette filter for an early 90s ZR1. I installed it and the anti-drainback valve either did not work or was not present. Every time I started I got a delay on pressure on the gauge until the filter was filled. I tried...

I recommend you tow the vehicle OR repair it where it died. I would hate to have you trash your engine because you drove it home. It over heated again you may not be in a good place to pull over. If you are a member of AAA then use your membership to get it home for you. I would recommmend...

I have a 88 XJ and changed my heater hoses in 2000. I used aftermarket hoses but they did not fix right. A couple years later when I changed coolant I installed new heater hoses from the dealer. The dealer hoses laid right and looked "correct". The aftermarket hoses even if they were the...

I am too lazy to walk out to my 88 XJ and look but I believe it is 0.035. Go out to your XJ, open the hood, look at the white sticker on the cowl, the spark gap should be listed on that "emisssions" sticker.

I use the stock champions in my 88 XJ 4.0 engine. I buy them at the dealer even though I can buy the same Part number. When I get them at a dealer the box has MOPAR printed on it, along with the champion stuff. I know chrysler puts requirements on Champion for the plugs that are not on the...

My understanding about the Renix engines and the HO engines beside the things previously mentioned the Cam is different. Renix is 87-90 HO is 91 & later So the marketing department got the engineers to change the cam so they could advertise more HP. Remember 91 was the first year Chrysler...

First place to look is your owner's manual. My 88 XJ owner's manual says you need to have the Aux trans cooler if you are towing over 2000 lbs. Second you have to ask yourself if you want to go on the word of others and hope you do not damage your vehicle or do you follow the manufacturer's...

The problem described is a bad check valve in the fuel pump, the pump inside the tank. There are two ways to fix this: 1) change the fuel pump 2) install the BMW check valve and continue to use the pump. To install the check valve you cut the larger rubber line between the tank and the fuel...

I have a 88 XJ, 158K and no cracks in the manifold. I asked the dealer mechanic who works on my XJ, he in his late 50s and worked on XJs when they were made by AMC. I asked him about manifold cracks, he told me it the 91 and later ones that crack. Remember the Renix engines have a EGR valve...

I have a 88 XJ Pioneer 4.0 AW4 NP231 and have the compact spare. I have a nice cover for the mini spare tire. It is cordivan color just like the interior. When chrysler did their changes in 1991 the cordivan color disappeared so finding interior stuff is a junk yard run. I went to the dealer...

Wish i was closer to you guys I would calibrate your TPS. I purchased the snap-on MT2500 off of Ebay and it hooks up and displays the TPS value. You just turn the TPS until you are on the money. Before I owned the test set I also did the back probe method. It is true the have you calibrate...

I have a 88 XJ Pioneer, 4.0, AW4, NP231 and when I got in 97 from my Dad's estate it had a 1 1/4 square receiver hitch with a rusted draw bar in it. Over time I installed a trailer light isolation box (draw-tite pn 18146) with a #10 wire for power directly from the battery. This had the 4 pin...