[F350 man]

So I'm looking to see if anyone has experienced an issue like this. My truck starts great and will idle fine for a few minutes. But once I start driving the thing will buck and fall off/miss like crazy. This will happen while driving, at idle both in drive and in park. Then at some point it will clear up and run just fine for awhile, and just as soon as I think everything is fine bang it starts up again. I just had the oil and fuel filters changed with no effect, is this stiction, possible injector issues, FICM, EGR, any other ideas??

The truck is bone stock has 190K on it and the FICM was replaced at about 150K and I have not noticed any white or black smoke from the tailpipe. The only thing I have seen is after a long freeway run at 75+ the wrench on the dash will come on but goes away when you turn off the key and no codes are present.

 

[TKOPerformance]

Your injectors have reached the end of their service life. Typical life expectancy is about 150k.

 

[F350 man]

Your injectors have reached the end of their service life. Typical life expectancy is about 150k.

While I have been thinking that the injectors are long in the tooth everyone I've talked to that had injectors go bad have indicated that the truck will smoke; alot and usually white smoke. I've seen nothing like this so was hopeing for this to be another issue. Anyway to check the injectors short of pulling them out?

 

[TKOPerformance]

That simply isn't true. You will only get smoke if the failure is allowing unmetered fuel into the engine. If the failure is in the oil side (spool valve, etc.) this doesn't happen.

 

[F350 man]

Update on this issue, turns out it is not an injector issue at all. After many hours of reading I found a reference to a problem that was just like I was having. I took the truck to a diesel shop that could run some tests and told them to pay close attention to the ICP valve as that was where I suspected the problem to be. Turns out that the pigtail had a short in it and that was causing all the issues, I had them replace the ICP valve also just to be sure and so far no futher issues. Just thought I would pass along this info.

 

[TKOPerformance]

What year is the truck?

 

[F350 man]

Truck is an 05

 

[TKOPerformance]

I think you mean IPR, not ICP. The ICP is a sensor, the IPR is a solenoid valve. I've never heard of oil damaging the pigtail on an '05-up ICP, but it is possible with the IPR.

 

[F350 man]

I think you mean IPR, not ICP. The ICP is a sensor, the IPR is a solenoid valve. I've never heard of oil damaging the pigtail on an '05-up ICP, but it is possible with the IPR.

You must have replied to this thread thinking about another thread?? I never mentioned anything about oil damaging the pigtail. Perhaps I confused you with the term valve, you are correct that the ICP is a sensor not a valve as I called it in a previous post. There was a short either a pin was loose in the wire connector or the socket in the ICP where the connector plugs in or could also have been a broken wire at the connector. I just replaced both to make sure the problem was fixed. The ICP is located at the front of the engine passenger side.

 

[TKOPerformance]

No, I just incorrectly assumed that it was the IRP, and when the IPR pigtail gets a short in it typically this is caused by oil saturation in the wiring. Its also common for early 6.0s with the ICP under the turbo to have the ICP wiring fail the same way. Pretty rare to have an ICP pigtail have issues on a late 6.0. Good that you got it figured out though.

 

[F350 man]

It was a wierd problem, I'm not sure I'd have ever figured it out if I had not come across another thread describing the same symptoms. But now that's fixed its on to the oil cooler issue next, should be lots of fun. :jester:

 

[ultraglide]

Did you try unplugging the icp and did it help similar problem at first now a no start