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  #31  
Old January 31st, 2018, 12:09
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Ecomike Ecomike is offline
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Re: Renix woes for 1988 XJ 4.0/auto

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Originally Posted by Ecomike View Post
IIRC you disconnected fuel/spark to one cylinder at a time with no change? Have you tested each fuel injector pigtail with a Noid light? while wiggling all the harness wires?

Do what you want, If it was me, I would set the Crank to TDC, and pull the cap and see where it is pointing, and see if the rotor has slop in the rotation.

Have you tried running and driving with the O2 sensor disconnected????

Have you confirmed that the O2 sensor heater is good (about 8 ohms) and that the heater wire, orange has 12-24 volts from the relay???
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34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #32  
Old January 31st, 2018, 15:04
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Re: Renix woes for 1988 XJ 4.0/auto

i sorted out my injectors ,thanks to Cruiser's info on which color wire goes where. they are all working as well.
when i was messing with this before, i got a new o2 sensor.
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  #33  
Old January 31st, 2018, 15:40
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Re: Renix woes for 1988 XJ 4.0/auto

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Originally Posted by Gunter View Post
i sorted out my injectors ,thanks to Cruiser's info on which color wire goes where. they are all working as well.
when i was messing with this before, i got a new o2 sensor.
OK, let me spell it for you in black in white, as they say.

A new O2 sensor is worthless if it is defective out of the box, and for bad brand-(China) quality, this is common.

Bosh is the Best for Renix (I think you said you bought Bosh?)

BUT!!!!!

IF the O2 sensor has a ground wire problem (over 1.0 ohms to ground at the Bat negative post) or is not getting 5 volts from the ECU, or not getting 12-14 volts from the power relay for the heat built into the O2 sensor, it CAUSES YOUR PROBLEM!!!!! Bad relay, or bad wiring!!!

Is that clear now???

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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #34  
Old January 31st, 2018, 15:44
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Re: Renix woes for 1988 XJ 4.0/auto

If you fixed the wiring harness problem, that made it switch running bad-good-bad when you you shock the harness, then you have a second problem!!!!

" I would set the Crank to TDC, and pull the cap and see where it is pointing, and see if the rotor has slop in the rotation.

Have you tried running and driving with the O2 sensor disconnected???? That is an easy way to see if the O2 sensor/wiring/ECU/Heater realay system is causing the low power and random miss!!!! Your problem is a common one for a wiring............................................ ..O2 sensor cause!!!!!!

Have you confirmed that the O2 sensor heater is good (about 8 ohms) and that the heater wire, orange has 12-24 volts from the relay???"
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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #35  
Old January 31st, 2018, 19:15
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Re: Renix woes for 1988 XJ 4.0/auto

Mike i will try this thursday.
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  #36  
Old January 31st, 2018, 19:27
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Re: Renix woes for 1988 XJ 4.0/auto

Bosch is NOT the best O2 sensor for Renix. NTK is.
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  #37  
Old February 2nd, 2018, 14:26
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Re: Renix woes for 1988 XJ 4.0/auto

ok the voltage is 14.86 when running and no difference when revved.
and ohms show nothing when i connect to the 3 wires on the O2 sensor.
so O2 is crap, dont have a spare.
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  #38  
Old February 2nd, 2018, 15:15
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Re: Renix woes for 1988 XJ 4.0/auto

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Originally Posted by Gunter View Post
and ohms show nothing when i connect to the 3 wires on the O2 sensor.
so O2 is crap, don't have a spare.
Sounds like it, if I understand what your saying??

Using The O2 wire that connects to the orange harness wire that had 14 volts, and
the black ground wire (ground) on the O2 sensor should read about 8 ohms when disconnected from the harness (IIRC*)


Read the thread I created for this 10 years ago for more blow by blow details of testing both sides, the harness wiring to the ECU and the O2 sensor.

http://www.naxja.org/forum/showthread.php?t=1012701
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Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091

Last edited by Ecomike; February 2nd, 2018 at 15:22.
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  #39  
Old February 2nd, 2018, 15:48
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Re: Renix woes for 1988 XJ 4.0/auto

i was not sure, so i used the orange wire and each of the other two wire in the o2 sensor plug. both same result.
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  #40  
Old February 3rd, 2018, 04:32
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Re: Renix woes for 1988 XJ 4.0/auto

Test the resistance BETWEEN the Red and Black wires with the sensor unplugged, and on the plug connected to the sensor, not the one on the harness side.
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  #41  
Old July 10th, 2019, 01:10
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Exclamation Re: Renix woes for 1988 XJ 4.0/auto

ok so reply and this is fixed.

i finally worked it out. and i got the REM from Nickintime on YT. you can view all your sensors live and scroll thru them and see what your engine is doing. best 100 bux i ever spent in this mess.
my advice for noob Jeepers with a Renix; get the REM; and things to watch for --head to intake and exhaust gasket. tps and fuel pump and the engine harness. if you have harness issues, get one from a junkyard. not easy to replace, but is do able. it is a separate harness from the main. from the CPU to the engine . and follow Cruiser's ground clean up
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