And - IDM Replaced. Now What ? - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 10-17-2011, 08:53 AM Thread Starter
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And - IDM Replaced. Now What ?

Ladies and Gentleman.

1999 F350 Super Duty. 7.3 Liter. Was running fine. one day started running rough.

replaced:

1. Fuel Filter
2. Air Filter
3. Crank Sensor.

Continued to run rough ?

Took it in they tested and it showed low voltage fuel injector
1, 2, 3, 4

Suggested new IDM. So I purchased a Reman IDM 120 from (ACE) Davie FL.
my truck originally had a 110. It ran terrible with the 120. They sent me another reman 110. The reman is doing the same thing my original 110 did.
runs rough.

So Now What ? I'm lost in these woods. What am I missing ? Harness ?
Fuse ? bad plug or wire, something ?

You guys are the best. Hope you can help me.

Thanks for being you !

Cheers
MCC
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post #2 of 4 Old 10-18-2011, 09:24 PM
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Front half of the harnesses under the valve covers. Check where the external harness plugs into the VC connector. You may find them loose, or find burned pins.

Next, remove the valve covers, and look at the UVCH plug ins. I would almost guarantee that they are becoming loose/disconnected from front to back. The symptoms you are giving, are low voltage cylinders 1+3 and 2+4. This comes from a bad connection, and if nothing external is leaping out at you, then time to go under the covers.

Good luck
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post #3 of 4 Old 10-18-2011, 10:46 PM
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Quote:
Originally Posted by Highwaywrench View Post
Front half of the harnesses under the valve covers. Check where the external harness plugs into the VC connector. You may find them loose, or find burned pins.

Next, remove the valve covers, and look at the UVCH plug ins. I would almost guarantee that they are becoming loose/disconnected from front to back. The symptoms you are giving, are low voltage cylinders 1+3 and 2+4. This comes from a bad connection, and if nothing external is leaping out at you, then time to go under the covers.

Good luck
thats deffinetly the problem!
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post #4 of 4 Old 10-19-2011, 04:50 AM Thread Starter
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Gentleman,

Appreciate you taking the time to post your suggestions.

She idles good when you bump the pedal. I'm going to check the Fuel pump. and see If the pressure is good ?

The only thing left after that is the harness. I replaced, IDM, Cam Sensor, Fuel Filter, Air Filter. (no change)

Fuel pump and harness is all that remains.

We having fun yet ?

I'll keep you posted !

Thanks for being you

Cheers
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