Join Date: Feb 2010
Location: Thompson Falls, Montana
Feedback: 0 reviews
I had a long series of issues with O2 sensor readings. I swapped sensors multiple times, tore the engine down looking for vacuum leaks, replaced the plugs and numerous other things. I recently discovered the issue to be the connection of the engine harness at the ECU. Wiggling the main harness would cause my O2 sensor readings to fluctuate.
A disconnect and reconnect of the levered connector made the issue go away for several months, but it recently returned. Another unplug, and re-plug and it's fixed again. I'm thinking of using some zip ties to help keep the strain off the connector. Beyond that I'm not sure what to do for a long-term fix. Replacing the main harness and/or the ECU seems like overkill, but ultimately might be my only choice.
Wiggling the harness at the ecu with the engine off, and monitoring the O2 readings would let you know if that's part of your issue.
'76 CJ-7, '43 CJ-2a, '78 Bronco,'78 CJ-7, '75 CJ-5, '78 CJ-7, '80 CJ-7, '78 SJ, '79 SJ, '78 and a '76 FJ-40 , '90 XJ, '91 XJ, '86 CJ-7, '95 ZJ, '68 CJ-101 Commando, '00 TJ, '68 M-715, 2 '86 Military Blazers, '96 LR Discovery, '86 CJ-7, '91 YJ, '99 TJ, 07' JKU Rubi, 1988 YJ, 1973 Commando, 3 Diesel Excursions....
Now back to a 2013 JKU Rubicon with "stuff", planning 37's with minimal lift.
I've tried them all... Jeeps are still the best. (0||||0)