motor swap.. not running right - Ford Powerstroke Diesel Forum
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Old 11-18-2010, 05:53 PM
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motor swap.. not running right

hey guys.. i bought an early 99 powerstroke with a blown motor a few weeks ago. we picked up a 2001 motor, turbo, injectors and everything and swapped it all. we finally have it all back toghether now but it dosent run very good sometimes. this morning it started up fine and drove fine all the way to work with no problem. then i went to start it 2 hrs later and it had an erratic idle.( up and down) and very shakey.so we put a scanner on it and ran a cylinder contribution test and it was saying 1,3,5,7 werent firing. so i took it out and ran the heck out of it for a mile or 2 and it started running right again until i let it idle for a bit then it wasnt bad but you could still tell it was missing a little bit. I havent changed the pcm, idm, or harness. my dad took the valve covers off and looked at all the connections and tested the injectors and all was good. my next guess is the harness bein bad or somethin. bein that the computer is for the smaller injectors and turbo do i need to have it reflashed or get a new one? what about the idm? thx
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Old 11-19-2010, 05:44 AM
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i don't think the early 99 IDM will work properly with the newer injectors. at least thats what i was told. maybe a tech will chime in with more info.
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