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Thread: Help: Random rough idle......?? Reply to Thread
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  Topic Review (Newest First)
09-15-2019 12:28 PM
6literbeater Installed a new icp and a turbo last week. Now I’m showing 7 codes after putting the truck back together.
I also noticed under full throttle my ipr goes up to 84.5 and I don’t remember it getting that high. Icp over 500 at idle and maxes out at 3000 I believe

Gotta love working on these trucks
09-03-2019 11:07 AM
iqraceworks ****FIXED IT****

Well, I think I fixed the problem. It was either in the butt joint splices where I had connected the aftermarket ICP pigtail connector last year, or the internal terminals of the connector itself.

I got my new Motorcraft ICP pigtail connector in Friday. I cut the old aftermarket connector off, and soldered on the new Motorcraft connector, and then heat shrinked the solder joints.

Over the weekend I put about 500 miles on the truck with the new pigtail ICP connector. The truck ran great, I didn't have a single issue.

Just another example of why it's better to spend the extra money up front on these trucks and buy the genuine Motrocraft part vs. the cheap aftermarket stuff.
09-02-2019 03:52 PM
6literbeater I forgot to mention the idle issue. Was going back and forth 100 rpm causing a surging and now I have what sounds like misses but diesels don’t miss so I have no idea yet. Hopefully we have the same issue. Icp looks good on the Scanguage though. Always above 500 on the start
09-02-2019 03:47 PM
6literbeater I’m having the same type of issue. Truck starts up in the morning fine and dandy but by the time I get to work the truck starts surging when I sit still in gear and out of gear. I was going to swap my icp for one from an 04 to see if this corrects the problem but I’m still in the research stage because I want to troubleshoot the issue first.
This weekend after getting sporty on the beach rescuing a quad and almost getting stuck myself I was bouncing around and a few wot’s I acquired another issue with my first crank no start and now my boost maxes out at 20 and I believe I have seen as high as 40 before this but I may be mistaken. I will swap my icp and update

Btw where did you get that icp from? The one I have came of a 200xxx plus mile truck that seized supposedly. It was free so that’s why I took it. I’ll be watching this thread
08-29-2019 03:56 AM
iqraceworks Thanks for the wiring diagram. I've driven the truck for 3 days now with the ICP unplugged....not a single issue. At this point, I think I found my problem.

My new Motorcraft pigtail should be in by this Saturday, I'll swap it out and see what happens.
08-27-2019 06:44 PM
Hydro Here is the engine wiring for that 05, maybe it will help chasing the wires
08-27-2019 06:40 PM
iqraceworks It's an 05'
08-27-2019 06:36 PM
Hydro What year is your truck? didn't see that at the start of this thread
08-27-2019 06:30 PM
iqraceworks I did end up unplugging the ICP sensor on the truck before I drove it home from work. Not a single issue at all. I'm going to drive to tomorrow with the ICP unplugged again....if it doesn't act up, I'm going to say it's an ICP wiring issue.
08-27-2019 06:11 PM
Hydro Yes the IPC should have been with the other readings -- and yes, if the connection is flakey, but not failed, it could act that way without setting a code
possibly a bad sensor, connector, or wiring up to the PCM -- have you checked the main harness connector? where the engine harness connects to the body harness -- intermittent troubles are very difficult to pin down

For sure you need to run the stock tune when troubleshooting a problem -- as you mentioned, some tunes mess with the warnings
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