Kligeti

Temp closeout on this thread. Going away from home for work. Will be back in late August to hopefully solve the problem.

Hello, I know this is an old thread but any update?

This unfortunately did not fix it😔

I want to say I’ve got a decent lead now! After removing the rail anll the injectors look good but the diagram in the regulator is visibly leaking! Which in this case might be a good thing haha. Going to replace it now. Not sure why it was dry last time I checked. Perhaps it was too long since it ran last or something.

I’m going to pull the rail now, and inspect

Pulled the instrument cluster. No change In Behaviour.

Same story there, 14 running 12 dying. Swapped ecu plugs over to new ecu and that didn’t help.

Just had a buddy help. Voltage went from 14.3 to 12.1 when stalling

O2 sensor unfortunately didn’t fix it. I am starting to think I am loosing spark intermittently. A light between coil and distributor cuts out when stalling. Coil and icm are new. Cps and distrubutor new. Any ideas?

Wiggle tested, smoked vaccum(no leaks visible), manifolds look good. Currently have Bosch O2 but picked up ntk, planning on install tomorrow. Thank you all for the help so far. Also going to pick up an extra ecu off someone for cheap tomorrow, figured not a bad idea to have a spare and I can always sell it again.

There’s no signs of fuel in this line, did some further diagnosis and it looks like I am also losing spark when it tries to die. I am leaning towards a bad PCM? I ordered a smoker to attempt to check more in depth for vaccum leaks this weekend.

What is the check for this do I need to make some sort of catch can or something?

I’ve done a number of the tips mostly the cleaning of grounds and such

I’m chasing an intermittent issue on my 1990 Jeep Comanche4.0 Renix, and I’m running out of ideas. The main problem is that it never seems to enter closed loop. It runs extremely rich with a strong fuel smell, and every once in a while, it’ll suddenly run terribly, stalling repeatedly and backfiring. Between episodes, it can run relatively normally, but it’s always rich. So far I’ve replaced the TPS, IAC, CPS, coolant temp sensor, MAP sensor, O2 sensor, ignition coil, ignition control module, spark plugs, and the fuel pump. Fuel pressure is within spec. Vacuum lines all look good, including the MAP line, and I’ve checked the Renix sensor, and ECU grounds, which appear good. Using a Renix engine monitor hooked to a computer, all sensor data looks reasonable. It reaches normal temperature, but never actually transitions into closed loop. Instead, it reports a closed loop rich error and stays open loop. At this stage, I’m trying to figure out what’s left. Could this still be something like leaking injectors, a bad fuel pressure regulator even with correct pressure, an ECU injector driver issue, damaged wiring, or some other known Renix quirk? Has anyone fought this exact combo of symptoms? Any test or common failure points you’d suggest before I keep throwing parts at it? Thanks.