Author Topic: Renix diagnosis help  (Read 1565 times)

Online Big Dave

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Renix diagnosis help
« on: October 21, 2016, 03:32:13 PM »
I was wheeling on Saturday & noticed all of a sudden the Jeep was running differently. Sitting with it in park it idles fine & revs fine. On the trail, in drive, it stumbles/shutters. It does a very small amount in reverse too or it could just be my imagination. 

When my wife & I noticed it I immediately got out & checked the exhaust system. Felt like it was flattened. Everything was fine. I then checked to make sure there wasn't a hole in the transmission pan. Thought it might have been loosing fluid. Nope.
We weren't too far from a town so I figured it would make it to a parts store & look it over. 
From a stop, it would accelerate but like it had a bad plug or wire, transmission slipping &/or vacuum leak. Once it shifted out of 1st gear the issue went away. One time it did it in second also. That, or it never shifted from 1st. Not sure.
I figured that as long as we maintained highway speed we'd be fine. So we hit the road & didn't have any problems until we stopped for food. But once back on the interstate, it was smooth sailing. 
We made it home just fine. Since then I've 
- added a pint of ATF
- pulled each spark plug one at a time while running 
- pulled the air filter 
- checked for vacuum leaks 
- checked fuel pressure (31 & 39 with vacuum line off)
- cleaned the throttle body & IAC
- replaced throttle body with a spare that contained it own tps, IAC & whatever else was on it
- replaced the fuel filter

None of the above had any affect on the issue. 
What am I missing?

It's a 89 I6, automatic with a bone stock engine & 25x,xxx miles. 

I did plugs, wires, cap & rotor button about 5k miles ago.

Offline clark123456

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Re: Renix diagnosis help
« Reply #1 on: October 22, 2016, 08:36:30 AM »
I was thinking torque converter.  Even when my ignition was 'missing', it didn't shutter.
1998 TJ Sahara

Thanks, Dandelion!

Online Big Dave

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Re: Renix diagnosis help
« Reply #2 on: October 22, 2016, 02:40:23 PM »
I'm going to blame 27+ year old wiring. I wiggled the TPS & fuel injector wires & it runs fine now.