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unplugged pcm(replugged it in), cranks, wont run

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Old 11-16-2008, 12:54 PM
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Default unplugged pcm(replugged it in), cranks, wont run

well, I was going to test another pcm as i was having maf issues. PLugged the pcm back in (only thing i did, other than ran a jumper wire for pink maf wire) car cranks, holds to about 500 rpms and dies.
Old 11-16-2008, 03:37 PM
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I hope you disconnect the battery before switching the PCM's
Old 11-16-2008, 05:47 PM
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I didnt what would this cause. I never SWITCHED pcms, just disconnected my same one. car wouldnt idle before (maf issues). ONly thing changed since this was disconnecting and reconnecting pcm.

basically car ran before, I disconnected pcm, now it wont start, It fires, it will build up some rpms, but no initial fire.

Last edited by chetmo; 11-16-2008 at 06:00 PM.
Old 11-16-2008, 06:45 PM
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I've disconnected my PCM before (to be safe you should) to run wires behind it without disconnecting the battery....but made sure the ignition was off. If the ignition was on might need a crank relearn? Time to check for any codes.
Old 11-16-2008, 07:59 PM
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no codes, just the sam MAF code that im chasing down at the moment. Im really not sure where to begin to look at the moment.
Old 11-17-2008, 05:03 PM
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any other ideas?
Old 11-17-2008, 05:38 PM
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What's the MAF code/issues? Checked the ENG SEN fuse? P0102? Car should run even with the MAF disconnected. Just some ideas....
Old 11-17-2008, 06:19 PM
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Unplugging a pcm and not pulling 12v from the battery wont kill an ecm so that shouldnt be an issue. As for as your other issue, i would be looking for a blown fuse, melted wire for the o2 sensors. You have headers right?
Old 11-17-2008, 09:31 PM
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maf isnt my concern, as i know what i need to do to find that issue (its p0102) no 12v to pink wire at the moment fuse is good, but since i unplugged the pcm and replugged it in, car will not start, turns over, gets fuel etc, just doesnt want to fire up.
Old 11-19-2008, 05:51 PM
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im pretty sure im dragging this thing on a trailer this weekend and taking it to a shop! so we will see whats up.



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