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 vic. And I swapped in the 5.0 engine from a 1999 Mountaineer. After the swap, I was experiencing ignition module failures pretty often.
One thing I've recently determined is that there is more to the engine swap than just a new firing order. Evidently all Mountaineers had the HO engine. I had to re-pin the injector harness to get the injectors to fire correctly. And I've replaced the ECM with an old one I had on the shelf. The engine has responded nicely, and now will fire and run!! I've driven it a few times and all seems well. But I don't know how to have confidence in the Jeep as she's let me down before.
So the questions:
Would having the injectors firing order incorrect cause premature ignition module death? How?
Would this set up kill an ECM?
I understand the firing order issues on the distributor/mechanical side of things. But not really sure what's happening on the ignition side of things. Honestly, I don't know how the engine ran as well as it did initially after the swap at all. It seems like the gas and spark would be way out of line. And I shouldn't have been able to start it at all (four injectors firing at the wrong time).
I'm very surprised that the ECM failed, as it's a new unit that has seen very little road time. I only replaced it because I had the old one on the shelf and it was a pretty painless swap. But it paid big dividends because it got me back on the good side of things.
Thanks for everybody's help.
~Drew
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 vic. And I swapped in the 5.0 engine from a 1999 Mountaineer. After the swap, I was experiencing ignition module failures pretty often.
One thing I've recently determined is that there is more to the engine swap than just a new firing order. Evidently all Mountaineers had the HO engine. I had to re-pin the injector harness to get the injectors to fire correctly. And I've replaced the ECM with an old one I had on the shelf. The engine has responded nicely, and now will fire and run!! I've driven it a few times and all seems well. But I don't know how to have confidence in the Jeep as she's let me down before.
So the questions:
Would having the injectors firing order incorrect cause premature ignition module death? How?
Would this set up kill an ECM?
I understand the firing order issues on the distributor/mechanical side of things. But not really sure what's happening on the ignition side of things. Honestly, I don't know how the engine ran as well as it did initially after the swap at all. It seems like the gas and spark would be way out of line. And I shouldn't have been able to start it at all (four injectors firing at the wrong time).
I'm very surprised that the ECM failed, as it's a new unit that has seen very little road time. I only replaced it because I had the old one on the shelf and it was a pretty painless swap. But it paid big dividends because it got me back on the good side of things.
Thanks for everybody's help.
~Drew