cruiser54

Yes, it could be. But, I would buy the 2 Napa cables described in the ground refreshing and install them in the meantime.

anticreep

Yes that's my next step before I do anything else.

cruiser54

Keep us posted.

Interesting thing happened over the weekend with my neighbor's 87. He just got it. We hooked it to the factory tester and everything looked good but the O2 sensor switched slow as if it was failing. He was ready to buy a new one and I suggested he wait til we did the refreshing and additional cables.

Runs like a champ now. Smoother, no hunting idle and the tester shows a rapidly switching O2 sensor!!!

anticreep

I sure will. Hopefully by Friday I get those and it fixes it right up.

I sure wish u was my neighbor a couple of weeks ago. HAHA.

DFlintstone

Post #12 on the 25th^. Glad you showed up Pete!

cruiser54

Do this if you haven't already. AFTER the ground refreshing.

Cruiser’s Renix Sensor Ground Test


This sensor ground circuit affects the CTS, TPS, IAT, MAP, ECU and diagnostic connector grounds. It’s very important and not something to overlook in diagnosing your Renix Jeep as it is common for the harnesses to have poor crimps causing poor grounds. If any or all of the sensors do not have a good ground, the signal the ECU receives from these sensors is inaccurate.

Set your meter to measure Ohms. Be sure the key is in the OFF position. Using the positive (red) lead of your ohmmeter, probe the B terminal of the flat 3 wire connector of the TPS . The letters are embossed on the connector itself.
Touch the black lead of your meter to the negative battery post. Wiggle the wiring harness where it runs parallel to the valve cover and also near the MAP sensor mounted on the firewall. If you have an 87 or 88 with the C101 connector mounted on the firewall above the brake booster, wiggle it, too.

You want to see as close to 0 ohms of resistance as possible. And when wiggling the harnesses/connectors the resistance value should stay low. If there is a variance in the values when wiggling the wires, you have a poor crimp/connection in the wiring harness or a poor ground at the engine dipstick tube stud. On 87 and 88 models, you could have a poor connection at the C101 connector as well.

Revised 06/12/2012

DFlintstone

The CPS it's self, unplugged should put out/show .35 ACV, minimum. (while cranking) This would be the first time I saw posted reading a full volt! Being that your resistance reading is out of speck, of course I'm wondering if that is a good reading. I DID see one, (actually he said he'd driven home), that reportedly ran at a .1, but died often.

anticreep

I hooked up two different meters and they both showed 1.0 ACV unplugged while cranking it over.

DFlintstone

Supper! Assuming that is a 1. and not a .1, that is the highest I've ever seen posted.

"it has a bit of a stall and a backfire when giving it gas around 1/4 to 1/2 throttle"

When one of the wires to my lower sensors was grounding, (in that photo), it shot the mouse nest in the air cleaner out the front grille. I then drove through the confetti! No sign of the mouse. I was a bit confused at first where all that paper came from. (side note, there is a hole, ontop, behind the glove box latch, that a mouse might use to remove your registration and proof of insurance).

It would sputter, dog, and backfire at mid throttle, but go like a ###### ape floored.

anticreep

Sorry it took me so long to get back. Internet people sure do like there payments. And started a new job welding on barges. But anywho I changed the main ground cable to a 2ga and the ground from the firewall to the head to 4ga helped out a crap load but still not 100% going to change the main power cable it has a few burn spots.
And redo some bad spots on the main ground coming from the computer.