TheFerret55 Posted March 30 Share Posted March 30 I just pulled an ECU out of a 90 Cherokee (doing the upgrade for my 88 MJ) and noticed it doesn’t have the factory sticker on it but one that says it’s a Mopar rebuild from 2002. Is there anything special with these (I heard somewhere that there was a Mopar upgraded ECU at one point?) or is it the same specs as an OEM computer? Thanks! Link to comment Share on other sites More sharing options...
Salvagedcircuit Posted March 30 Share Posted March 30 This would definitely be some interesting information to know. The PO must have installed a rebuilt ECU in mine, but it does not say mopar anywhere on it. I think it was done by cardone, or whoever they farm it out to. Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 30 Share Posted March 30 The only upgraded ECU is 89-90 There was a performance ECU offered for a short bit. Link to comment Share on other sites More sharing options...
Ωhm Posted March 30 Share Posted March 30 I wonder if it’s an ECU that was returned under a warranty claim, tested and No Trouble Found (NFT). Re-issued and placed back in the marketplace. Link to comment Share on other sites More sharing options...
TheFerret55 Posted March 30 Author Share Posted March 30 39 minutes ago, eaglescout526 said: The only upgraded ECU is 89-90 There was a performance ECU offered for a short bit. Would you happen to know the performance ECU part #? Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 31 Share Posted March 31 4 hours ago, TheFerret55 said: Would you happen to know the performance ECU part #? Ill have to look in my mopar performance catalog. It’s floating around somewhere on here as well. Link to comment Share on other sites More sharing options...
Salvagedcircuit Posted March 31 Share Posted March 31 It would be interesting if someone found a document stating the "rebuild" procedure. My guess: replace the electrolytic and tantalum capacitors, re-silicone it closed and ship it. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 31 Share Posted March 31 If that. If you can find the OEM number on the unit somehow, we could determine the year. The performance ECU had a P as a prefix FWIW. Link to comment Share on other sites More sharing options...
TheFerret55 Posted March 31 Author Share Posted March 31 I installed it last night and I could noticeably tell it was idling better. Haven’t been able to actually drive it yet since I had some other stuff torn apart but I’ll report back today once I drive it. Link to comment Share on other sites More sharing options...
TheFerret55 Posted March 31 Author Share Posted March 31 4 hours ago, cruiser54 said: If that. If you can find the OEM number on the unit somehow, we could determine the year. The performance ECU had a P as a prefix FWIW. I looked over the case and couldn’t find any other part numbers besides the one sticker on it. Maybe I could find it if I took the case apart? It was a struggle to get it installed so I don’t really want to take it out again for a while haha Link to comment Share on other sites More sharing options...
TheFerret55 Posted April 1 Author Share Posted April 1 Drove it on the highway this morning and it seems to have a little more pep to it with the new ecu and the cold starts are smoother Link to comment Share on other sites More sharing options...
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