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Ugh....... Looking over my posts/history, I realized I have been fighting this electrical issue for almost 10 years! When it began the TFI module would go out, I'd replace it and it would last a year or more then die. It's gotten progressively worse. And the last time it was "fixed" the Jeep...

Hey Mike, Let's see that wiring diagram. thanks!

1978 Jeep CJ5, fiberglass body, 1990 Ford 5.0 EFI engine. I've been chasing a TFI killer for 10 years. It hasn't been a constant. Frustration leads to the vehicle (Jeep) being pushed into the garage and ignored. In the spring I get excited, find a new solution or a mechanic to "fix" it and I'm...

The Megasquirt and Microsquirt are both aftermarket ECMs. THIS is the question I'm having. Everybody seems to "think" it's possible, but nobody seems to have done it. I've found posts that "think" it's possible to get the EEC-IV ECM reflashed....but again, no real experience doing it. The...

Thanks guys, but I’ve tried remote mounting, different distributors, new and used. I’m not new to Fords or these issues. I’ve swapped most of the wiring and thrown parts at it in desparation. I’ve had two different (expensive) garages try to fix it. The factory TFI isn’t working…. And I’m done...

I have a '90s 5.0 swapped in my Jeep. It ran great for a very long time. But the last 6-8 years it's been eating ignition modules like candy. Seriously, the latest one lasted about 6 hours of run time. I've spent so much time and effort chasing this issue that I am just DONE. I'm tired of...

I'm fighting some demons in my 1978 Jeep CJ5. I'm reworking the 5.0 fuel injected engine wiring. The wiring harness instructions require a wire that is only hot during cranking to "kickstart" the ECM. It says that it shouldn't be hot all the time as it will cause a rev limiter condition. Since...

Yes, I am using the grey module (second from the top). I've moved it to the fender. I will check the voltages.

I opened the ECM and hoped to see a resistor or something burned or bloated. But it looked 100% fine........

I've been chasing some gremlins trying to find the thing that's killing my ignition modules at a rapid rate. I didn't want to add to my previous post as I found an answer of sorts. Over the last year I did an engine swap in my Jeep CJ5. The 5.0 engine and the EFI system are from a 1990 Crown...

Yeah, Jeep used a version of the T5 transmission in the Wrangler. I went a similar route as my 78 CJ5 used a FORD "style" transmission. I just had to change the bellhousing to bolt up the engine. Ran carburetor for a few years, then graduated to the EFI........ She's pretty awesome... when she...

According to that harness' description, only the truck/broncos are batch firing. It states that I am to stick with my ECM, but the harness works for the HO firing order. NON-HO harness can be ordered. I'm not sure what would change in the harness for the firing order. I am not running an...

Since I've been having issues, I've been demanding Motorcraft modules. Initially it made a difference. But any more, none of them last long at all. I killed several on one long drive. I've been using the correct thermal paste (Artic Silver), I've tried junkyard (known good) distributors, new...

My 5.0 is in a Jeep, and it came from a '90 Crown Vic (Speed density)..... manual transmission.

Does anybody have any first hand experience with this harness or company? https://www.ebay.com/itm/Ford-5-0-EFI-Speed-Density-universal-wiring-harness-1985-1992-/231009496806?fits=Make%3AFord&hash=item35c93d2ee6:m:mBR6-uFFWApK3R-4LStDUfg&vxp=mtr I realize I'm out of touch a little bit, as Ron...

I think something is "killing" the TFI too...... it's just a matter of figuring out what it is. The TFI/Jeep was VERY stable for 10-12 years. Normal issues, but fixed and ran fine. But this last year it's just been torture. Thinking I've had it fixed, and ever time it's been tested long term...

Hey Jrichker.... any chance you can send me a link??? Ha ha.... just kidding! But you have me praying for constipation, so I'll have time to read all that! Thanks. For the record, I used Arctic Silver once, and then what version O'reilly sells once..... That's exactly the reader I ordered...

Ultimately, I need this resolved and will take any advice for getting the Jeep back on the road and dependable. It's finally 100 degrees out, and I'm stuck in the garage. But this post is asking primarily where to find a reman/new distributor for the motor. I welcome the side discussion of what...

I'm checking everything at this point. I seriously have some gremlin that needs to be exorcised out of this vehicle. I'll be adding some grounds to be sure things are as solid as they can be. I just ran into a post about fuel pressure tonight, so that's on my radar....... If the TFI modules are...

I'm really not chasing the module as much as I am a quality distributor. I can get Motorcraft modules all day long at O'reilly's if I specify it, and don't mind waiting a day or so. But I keep reading these posts where guys are buying remanned, or "new" distributors. I can't find a source any...