Cruiser’s Mostly Renix Tips
Technical DIY instructions covering common issues on the Renix XJ Cherokees and MJ Comanches (1987-1990). Preventative and proactive procedures to save you headaches, time, and money.
Many of these tips were provided to me and my buddy Joe by JeepTech when I was Service Manager/Shop Foreman at a Jeep dealer from 1980 through 1992. That’s what “The Book” is all about. Our notes from back in the day. Right from the Field Service engineers. Thanks Lonnie and Big Al!! Most were never published, until now.
Tips 1 through 5 are a great place to begin before chasing your tail with parts replacements on your 87 and 88 Jeeps. These are pretty much “haftas” in Renix Jeep ownership. You can skip Tip 2 if you have an 89 or 90. But, do the Tips first……….Avoid firing the “parts cannon” at your Jeep!!!!!!!
The next priorities on your Renix Jeep are Tips 11, 13, 31, 25 and 26
A simple multimeter is handy along with a few other basic tools……so dive in and get to know your Renix Jeep.
Some Tips also transfer to later years, or the techniques can be adapted.
If you have a 91 or later, see Tips 1, 3, 10, 11, 12, 15, 16, 18, 19, 20, 24, 29, 30, and 36.
If you have an 84 through 86, see Tips3, 12, 15, 16, 18, 19, 20, 28, and 30.
1 – Ground refreshing and Upgrades
3 – Connector and relay/receptacle refreshing
10 – Trans plug connector refreshing
11 – Throttle body and IAC cleaning
12 – Setting your 4.0 to #1 TDC
13 – Renix Distributor indexing
14 – Restoring Throttle Butterfly Adjustment
16 – Vacuum test for exhaust restriction
18 – Improving the instrument panel ground
19 – Headlight harness installation
25 – Valve cover mod ***NOW WITH VIDEO***
27 – C101 Connector Elimination ***NOW WITH VIDEO***
28-Improving blower motor performance
29-Improving the fuel pump ground
30-Adding the Sentinel Headlamp feature
31-Throttle body to MAP hose upgrade
32-Renix metric oil filter to SAE filter
33-Converting to an open cooling system
34-Eliminating the Heater Control Valve
35-Reducing cabin wind noise
36-Bypassing the Power/Comfort switch
38-Improving the wiper motor ground
39-4.0 Engine Removal
40-More power for your 87 and 88 4.0 ***VIDEO***
41- Easily track down and repair ENGINE VACUUM LEAKS