1995 Jeep 4.6 Stroker

[mpgmike]

Those would be the old part that has failed. The new one has "LXH8T245" stamped on it.

[AndreyB]

I have these with molex soldered

WhatsApp Image 2025-07-31 at 13.11.13_b852feba.jpg

[mpgmike]

Perfect!

[mpgmike]

Finally got a "day off" to play with the Jeep and UAEFI. I got it running with the LS coil packs. I disabled everything else I previously controlled to focus on the ignition part. The timing table is what I had with the distributor. Earlier today I captured 2 emissions tests with the stock ECU running the show. After the install, I drove it around awhile to make sure it wouldn't die on me like the earlier versions did. I then did another emissions test. I will definitely have to do better tuning, but it seems to be running. Looks like the upgraded U103 is holding up (at least longer than the old one did).

LS_Coils1.png

I'm a bit gun shy still, so I left the factory distributor in place in case I need to do an emergency road-side swap-a-roonie. Swap ignition wires, unplug the rusEFI, and plug the stock coil back in -- back on the stock ECU.

LS_Coils2.png

Many thanks to AndreB for working with me on this one. He is truly dedicated to making this the absolute best platform of its kind.

[mpgmike]

With over a month of reliable driving, I am ready to dive deeper. That new TI U103 replacement is doing the trick for me.

[mpgmike]

It would appear my confidence level in the rusEFI surpassed my skeptical threshold. I removed the distributor and stock ignition coil and swapped in a later model Cam Position Sensor.

DistOut.png

CmsIn1.png

It wouldn't start! Found there was no 5 volt VREF to the new sensor connector. Traced it back to a bad crimp job on the UAEFI pin C1 (shame on me for sloppy work). Fixed that, and it started. It surged at idle, and died when I tried to give it throttle. I connected my dual-trace O'scope to the Crank and Cam sensors.

CmsScope1.png

Sure enough, as careful as I was to align the shutter wheel with the pick-up to match the position in the distributor, I was off. The next picture is a screen image from the scope. I added a line (Start) where it aligned initially. The Hi/Low transition must occur between the groups of 4 pulses on the Crank Sensor. It was happening after the 1st Crank pulse. I loosened the hold-down clamp, slowly twisted the new Cam Sensor until the transitions fell about midway between the 4 pulse groupings. Had I gone the wrong direction, it wouldn't run at all. With sequential individual coils, it would have tried to fire the wrong cylinder.

CmsScope2.png

On my test drive, it ran just like it did with the distributor. Next up will be to tackle fuel delivery -- including WB O2 feedback.