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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

1996 missing the MISSFIRE sensor

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Old Jan 1, 2021 | 05:26 PM
  #1  
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1996 missing the MISSFIRE sensor

I had to replace the 4.9 engine in my 1996.

I used a donor from 1995

I used the 1996 harness from my truck.

The truck runs but has a little bit of a missfire which I think is likely from a vacuum leak (haven't looked into much yet)

The only code I have is a P0385 Missfire Sensor

After doing some research I realized that I have that sensor on my old engine but not on my new one

AS far as I can tell this sensor is just for the ECU to look for misfires, so can I run without it?

it looks like a total PITA to put it on now as I would have to remove the fan, radiator, and it would just be a general PITA.

This truck is just for occasional driving, perhaps 100 miles a month

So anyone know what would happen if I do not swap it over?

 
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Old Jan 2, 2021 | 10:07 AM
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Originally Posted by Crispins
AS far as I can tell this sensor is just for the ECU to look for misfires, so can I run without it?
Yes, the engine will run fine....as well as a bright Check Engine Light all the time.


Originally Posted by Crispins
So anyone know what would happen if I do not swap it over?
Nothing detrimental will happen with the missing sensor. If something else goes wrong you will never know unless you periodically check for codes.
 
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Old Jan 2, 2021 | 11:19 AM
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Isn’t that part of the damper? That would bug me too much not to at least try. Maybe you can get the puller in there without removing the radiator. Even if it does need to come out it isn’t that time consuming or difficult.
 
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Old Jan 2, 2021 | 11:32 AM
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Correct, there is a stator integrated into the harmonic balancer. There is also a sensor mounted on the timing gear cover.
 
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Old Jan 2, 2021 | 07:59 PM
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Originally Posted by rla2005
Yes, the engine will run fine....as well as a bright Check Engine Light all the time.




Nothing detrimental will happen with the missing sensor. If something else goes wrong you will never know unless you periodically check for codes.
Thank you, that was what I was thinking but a confirmation is great.

Originally Posted by My4Fordtrucks
Isn’t that part of the damper? That would bug me too much not to at least try. Maybe you can get the puller in there without removing the radiator. Even if it does need to come out it isn’t that time consuming or difficult.
I am going to pull the parts off the old engine and put them on a shelf. If I am ever in there again I will toss them on. I do work a ton of hours and am real short on free time right now.
 
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Old Jan 2, 2021 | 09:54 PM
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I ran my '96 351W without the correct balancer (no stator ring) for three years. Constant check engine light, no easy way to know which cylinder is misfiring (if there was a miss). Seemingly that was it. I swapped in the correct balancer (note: didn't remove the radiator or fan), reset the PCM, and the code was gone. The weird part is, I had been chasing a driveline slack sensation for a long time, and once I remedied the misfire sensor issue & reset the PCM, no more driveline slack feeling. Strange no doubt.

For your use, I would keep the 1 year only parts on the shelf. It's not a big deal to swap them in if you opt to do so. But if you get rid of those parts, don't expect to find them again (especially the balancer).
 
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Old Jan 23, 2021 | 07:42 AM
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I tried to remove the ring from the old engine and ran into issues.

The balancer first came apart in the middle where the rubber ring is.

Then I tried to pull the stator ring off and it wouldn't come off either, ended up bending it all up.

All well, the engine runs great it is just going to have to stay this way.

Thank you for the info guys.
 
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