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1989 Mj Eliminator Upgrades And Projects I Have Done

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In this topic you will read about what I have done so far with my 1989 Jeep Comanche Eliminator Edition. I am simply making this topic because I like to read what other people have done and what their experiences are so I can learn from them. So if you have any questions or comments about what I have done let me know! I HAVE PICTURES!!  :rotfl2:






I bought it with 32,000 original miles.




Flowmaster Delta Series Exhaust

High flow cat


. :MJ 1: .


I had the cat and muffler welded together as well as a down pipe tip welded at the end of the exhaust

The cat was then welded onto the flange by the bottom scrap bar that supports the transmission


I had my exhaust/intake manifold gasket go bad on me so I replaced that and if anyone has questions on how to get to it just let me know. You do have to take the injectors off which I didnt know. I would also recommend a high quality gasket so you don't have to go through that long process again.




I bought a high performance oiled cotton air filter that you can clean with a solution. It has a warranty replacement. Good results and I like it. Here is the website: http://www.greenfilterusa.com/     :driving:


Regularly clean the throttle plate.


Tried the seafoam procedure to clean out the intake manifold to get the carbon out once. Id say its a good thing but do not do that often. Maybe every 50,000 miles




Upgraded the grounds on the engine, firewall, and inside one of the main wiring harnesses. Refer to Cruiser54's instructions!


Added LED lights in my dash. Pretty cool I think.   8)





I spliced the brake lights to wire in a four wire trailer plug. I did not cut the original truck brake wire though. I actually carefully just cut the insulation off and then soldered the plug wires on. This way I will always have a complete wire section for my truck brakes just in case the soldering becomes bad. No headache!  :group beer:


I recently added a supplemental wiring harness for the headlights to get the full voltage from the battery. I bought this: http://www.amazon.com/dp/B001P29X4G/ref=pe_385040_30332200_pe_309540_26725410_item

This was definitely a good upgrade! 25% brighter lights for cheap. You could go one step further and buy new e-code bulbs and housings. I chose not too...yet.


Old Lighting system with stock lights and wiring harness getting ~10 V:




New wiring harness with stock bulbs:   :rock on:






LOTS of ground checking and such because of a low idle issue. You can find my experience in my signature........



















As you can see I undercoated the bottom of the side panels just low enough where you cannot see if you were standing. I also coated part of my door jam so when I kick my feet off so no dirt gets inside my truck it won't scratch that surface. But where that wider coating is on top i guess you can say, is a black plastic cover that screws into those holes. So it covers the coating but I did it anyways.


Painted my bumpers a nice black finish.


I have a fiberglass cap on the bed.


Wax and keep clean!  :clapping:


NEW TIRES and 2" Lift. BFG 31's with a 2" coil spacer and rear shackles.






I made my own cupholder!  :yes:

It is an interesting concept but it works AWESOME.

I used foam from a couch cushion and cut it into the shape of the console. Then dug out the holes for the cups. I made the holes a little smaller because this puts side pressure on the cups when you put them in.


Drinks do not move at all

Insulates the drinks

and the cupholder itself is easily removable if not in use 






New poineer speakers in the door and side panels as well as a new pioneer radio which was a needed upgrade from my 25 year old speakers. Happy with the results. I can supply the model numbers if requested.


20% tinted windows




THE BEST UPGRADE   :thumbsup:  :wrench:


Dual Diaphram Brake Booster from a 96 Cheerokee and new matching master cylinder.


I actually wrote a DIY on this and just take a look. Twice the braking power of the stock system. I highly recommend this and this is a really clear writeup with a lot of views.






Flushed the coolent system a few times to keep it clean. 

A problem a came into is that I cannot get the drain plug in the side of the block out. A 3/8 extension does not fit and that is what it looks like should be the right tool. I havent figured that out yet so I just use the petcock in the radiator.


During this cold winter  :fs2: ... My heat was not normal. Jeeps should be shootin out heat that will burn your skin (not really). But I was getting like 70 deg air or less. Not right. And my temp gauge was showing fine and everything was running normal. Both heater hoses were warm... Now both were warm so you wouldnt think the heater core was plugged but it was.. I reverse flushed the heater core a few times both ways and now I'm getting amazing heat. I still have that vacuum valve so I had to clamp an extra hose in order to reverse flush. That valve also stuck during the -30 deg weather and did not let coolant flow through the heater core. Any questions please ask.




My heat works great now. I replaced the heater control valve because it was leaking and I also back flushed my heater core which it what really made the difference.




I did have issues with my Jeep not starting due to my bad CPS


Did all of Crusier54's renix tips and tricks. He did a good job with those writeups and helped a bunch.  :bowdown:


I have been having idling issues with a low idle. Here is the link to the thread: http://comancheclub.com/topic/42581-renix-dead-spot-and-idiling-low/


Added a Permanent Fuel Pressure Gauge on the Fuel Rail. http://comancheclub.com/topic/12565-permanent-fuel-rail-pressure-gauge/


Upcoming projects (topic will be updating)-------------------------------------------------------------------------------------------------------------


Buying a high quality gasket for that damn valve cover. It is always slowly leaking oil  :fs1:    COMPLETED

Taking the clear coat off my rims and polishing and re-clear coating

4x4 conversion





Again feel free to ask questions  :waving:

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No actully i did not replace the bulbs themselves. I bought led strips and put one behind the clear plastic shield and the grayish one. It lays behind those and on the bottom of the dash so it shines up and illuminates the gauges. I then hooked up a separate switch and power from the cigarette lighter

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  • 5 months later...

Can you possibly link to the Crusier54 electrical wiring thread you referenced? I can't seem to find it and am currently having electrical problems that are posing the largest delay for me. Thanks for the thread, your truck looks incredible...





These are two great posts that will help you tremendously. I am currently fixing a weird idle issue.

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