MJ Comanche Tech. Stock & Modified. MJ (86-92)
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C101 elimination

Old 03-09-2014, 04:13 PM
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Default C101 elimination

Just did a write-up with photos on eliminating that pesky C101 connection on 87 and 88 Renix Jeeps. Quite easy.

Click on the link in my signature and go to post # 27

Last edited by cruiser54; 03-09-2014 at 09:11 PM.
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Old 03-09-2014, 09:06 PM
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Cruiser strikes again haha i was just looking for a good writeup on this. Thank you again your timing couldn't be better
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Old 03-09-2014, 09:11 PM
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Originally Posted by RusNorthID View Post
Cruiser strikes again haha i was just looking for a good writeup on this. Thank you again your timing couldn't be better
Fix up that MJ!! Did you see my thread in this forum about the lost MJ?

Last edited by cruiser54; 03-09-2014 at 09:46 PM.
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Old 03-10-2014, 12:07 AM
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Ya i did thats a great story. I had a 66 f100 with the original 300-i6 i jad rebuilt and bored.that was my high school project and one day at the gas station this guy walked up and offered me 4k cash if i followed him to the bank claiming that this was his dads truck and he had just passed. His mom was at his house so he called his girlfriend and she drove her over she to one look inside at the original dash and pointed out the choke pull **** had a small red dot on the end she then told me that he had done this so she would remember which **** to pull to start the truck. After this i told the guy to give me a ride home because he had himself a new truck.unfortunately i never heard back from the guy and haven't seen it around but i loved that truck
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Old 04-05-2014, 07:56 AM
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I'm leaning more and more to suggesting a proper C101 elimination versus the normal cleaning.

I have seen "clean" and "tweaked" C101s have too much resistance in them.
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Old 05-03-2014, 10:35 AM
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Originally Posted by cruiser54 View Post
I'm leaning more and more to suggesting a proper C101 elimination versus the normal cleaning.

I have seen "clean" and "tweaked" C101s have too much resistance in them.
I have since updated and revised my C101 cleaning post to this:

Renix Jeep C101 Connector Refreshing


The C101 connector on 1987 and 1988 Renix Jeeps was a source of electrical resistance when the vehicles were new. So much so that the factory eliminated this connector in the 1989 and 1990 models. The factory recommended cleaning this connector to insure the proper voltage and ground signals between the ECU and the fuel injection sensors. We can only imagine how this connector has become a larger source of voltage loss and increased resistance over a period of almost 25 years. The C101 connector needs to be cleaned at least once in the lifetime of your vehicle. Chances are itís never been done before.

Almost every critical signal between the engine sensors, injectors, ECU, and some to the TCU, travel this path through the C101 connector.

That said, the cleaning described below is a real MUST DO right off the bat. But, I strongly advocate eliminating the C101 at some point by following the procedure with photos in Post 27. Soldering skills are required and it takes about an hour.

The C101 connector is located on the driverís side firewall above and behind the brake booster. It is held together with a single bolt in itís center. To get the connectors apart, simply remove the ľĒ bolt and pull the halves apart. You will find the connector is packed with a black tar like substance which has hardened over time.
Take a pocket screwdriver or the like and scrape out all the tar crap you can. Follow up by spraying out both connector halves with brake cleaner and then swabbing out the remainder of the tar. Repeat this procedure until the tar is totally removed. This may require 3 or more repetitions. Wipe out the connectors after spraying with a soft cloth.

If you have a small pick or dental tool, tweak the female connectors on the one side so they grab the pins on the opposite side a bit tighter before bolting both halves back together.


Revised 05-03-2014
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Old 05-24-2014, 11:29 PM
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Just did this on my 88 XJ, it was a piece of cake, and I had never soldered electrical before this. I would definitely recommend doing this for just the piece of mind.

Thanks for the write up on this Cruiser!
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Old 05-24-2014, 11:32 PM
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Originally Posted by Jeepcrazy5722 View Post
Just did this on my 88 XJ, it was a piece of cake, and I had never soldered electrical before this. I would definitely recommend doing this for just the piece of mind.

Thanks for the write up on this Cruiser!
Way to dive in and git-r-done.
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