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HELP Changed PCM now no start

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Old Feb 19, 2011 | 02:11 PM
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Cool HELP Changed PCM now no start

I just changed the PCM in my 96 f250 PSD and it will not fire (no smoke). there is no tach movement.

Background
before I changed the PCM the truck run (idle only) but stalled and would not restart

already changed the CPS and checked all the fuses.

and I have a WTS light and no CEL light

I hope someone here can help me out as I am trying to fix it myself and avoid a big repair shop bill again



Thank You
 
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Old Feb 19, 2011 | 02:36 PM
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Why did you decide to change the PCM ?

Do you have the correct replacement ?...
 
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Old Feb 19, 2011 | 02:40 PM
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Welcome to FTE!

What Rick said ^^^^^^!
 
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Old Feb 19, 2011 | 03:15 PM
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Have you tried putting the old one back in?

Did you disconnect the batteries before you took the old one out or put the new one in?
 
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Old Feb 19, 2011 | 03:16 PM
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Originally Posted by pjwoolw
Welcome to FTE!
!
What Pete said ^^^^^
 
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Old Feb 19, 2011 | 03:16 PM
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Originally Posted by Action4478
Why did you decide to change the PCM ?

Do you have the correct replacement ?...


I was losing tach signal as the tach did not move after the engine stalled
I replace the cam sensor twice thinking the first one maybe bad.

I was under the understanding that the PCM got the signal from the CPS and then sent a signal to the IDM to tell it when to fire the injectors. If this isn't ture please school me on how this whole thing works.

I am not sure if it is the same as I have not removed it from the truck yet, I plugged the new PCM in and ran a ground wire to it.


Thank You
 
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Old Feb 19, 2011 | 03:18 PM
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Originally Posted by fordpride
Have you tried putting the old one back in?

Did you disconnect the batteries before you took the old one out or put the new one in?

Battery was disconnected
NO I havn't rehooked the old one , I removed the IDM to see if it had water in it ,, do not hear water in it. it is in the house warming up as it is below freezing here in michigan. should I open it up and look inside?
 
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Old Feb 19, 2011 | 03:22 PM
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do you still have the old one
 
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Old Feb 19, 2011 | 03:28 PM
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Originally Posted by fordpride
do you still have the old one

Yes it is still inside the truck
 
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Old Feb 19, 2011 | 03:31 PM
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Was it new or used?

I would hook the old one back up and see if it will start you might have got a bad PCM
 
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Old Feb 19, 2011 | 03:37 PM
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Originally Posted by fordpride
Was it new or used?

I would hook the old one back up and see if it will start you might have got a bad PCM

It was a manufactured one NOT one from a junk yard
 
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Old Feb 19, 2011 | 03:40 PM
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I would hook the old one back up and see if it will start you might have got a bad PCM
 
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Old Feb 19, 2011 | 03:47 PM
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How about the posting up the PCM code or any numbers or identification on it.
 
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Old Feb 19, 2011 | 04:04 PM
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The old PCM is back in the truck

question is the new PCM supposed to come in a static proof bag or just in a box. the one I got was in a box NO bag

The IDM has a little bit of corrosion on the pins
is it bad? it doesn't slosh with I shake it
 
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Old Feb 19, 2011 | 04:08 PM
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Originally Posted by pjwoolw
How about the posting up the PCM code or any numbers or identification on it.

The only number is the NAPA no. XTP86751

the calibration no. off the door is 6-90a
 
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