Road Trip Issues
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
After doing a lot of reading, I am convinced that the issue is the IRP or IRP pigtail.
The PCM is obviously sending a signal to IRP to close to adjust to reach desired PSI.
I believe that the IRP is NOT responding to the commands, RE. Staying open.
The only question, is it a pigtail / wire issue or is it a sticking IRP.
One must be able to diagnos this...
Is the pigtail to the IRP a OEM item ??
The PCM is obviously sending a signal to IRP to close to adjust to reach desired PSI.
I believe that the IRP is NOT responding to the commands, RE. Staying open.
The only question, is it a pigtail / wire issue or is it a sticking IRP.
One must be able to diagnos this...
Is the pigtail to the IRP a OEM item ??
Thread Starter
|
Tuned
Joined: Feb 2008
Posts: 445
Likes: 1
From: Forest Grove, BC
Hi All its been a week plus since I have posted on my issue. That's because I have not done a thing about it YET.
I am not at home near my shop, and Im not driving the truck much.
I have been driving it every other day , sometimes a couple times a day and it is running as it should, EXCEPT I had to make a few short drives and stops , again it was running fine, then it was shut off for 5 min, started it up and immediately could tell it was screwing up. Took off and IRP at 84.7 all the way home, it didn't stall but the ICP was low and not building to what it should, Thus the reason for the PCM to send the 84.7 ( closing the IRP) to build ICP to desired level. Im assuming the IRP was not responding the the OCM command.
The strange thing is I drove about a mile and No engine light came on. Whats up with that??
Once I got home, shut it off, 30 seconds, started again and the dam thing was running good again.
Is it possible the IRP is sticking fully open, and not responding to the PCM commands??
But why did No codes come up??
I am not at home near my shop, and Im not driving the truck much.
I have been driving it every other day , sometimes a couple times a day and it is running as it should, EXCEPT I had to make a few short drives and stops , again it was running fine, then it was shut off for 5 min, started it up and immediately could tell it was screwing up. Took off and IRP at 84.7 all the way home, it didn't stall but the ICP was low and not building to what it should, Thus the reason for the PCM to send the 84.7 ( closing the IRP) to build ICP to desired level. Im assuming the IRP was not responding the the OCM command.
The strange thing is I drove about a mile and No engine light came on. Whats up with that??
Once I got home, shut it off, 30 seconds, started again and the dam thing was running good again.
Is it possible the IRP is sticking fully open, and not responding to the PCM commands??
But why did No codes come up??
Lead Driver
Joined: Sep 2012
Posts: 7,833
Likes: 96
From: Manteca,Ca
Take a look at the ICP connection , there's a grey clip that holds the 3 wires together take that off and look real close for burnt or white on the wires, start the truck and do a wiggle test to see if engine miss or acts up that would need a ICP pig tail, and you will see wack values for ICPV
Thread Starter
|
Tuned
Joined: Feb 2008
Posts: 445
Likes: 1
From: Forest Grove, BC
Ill give that a try tomorrow. The ICP readings seem to be consistant with normal driving and the IPR values seem to be consistant too, as I have been monitoring this for a couple weeks now.
I will check the pigtail tomorrow
I will check the pigtail tomorrow
Lead Driver
Joined: Sep 2012
Posts: 7,833
Likes: 96
From: Manteca,Ca
Yea its Intermitted , I had the same issue a while back drove me nuts, then the engine started to stall a lot more, the ICP and ICPV would be wack when it started doing this any other time would be normal, I had three dif Mechanics scratching there head over this and a few here too. If it is the pig tail its simple to do
Thread Starter
|
Tuned
Joined: Feb 2008
Posts: 445
Likes: 1
From: Forest Grove, BC
OK, Had to take the truck out today, several short starts and stops. Befor I went out, fired her up, warmed for 5 min, checked ICP and IRP, looks normal. Popped the hood and wiggled the ICP pigtail and no change. Fine.
Whent for a drive , 2 stops and starts, on the second start, could tell something was wrong, started driving and IRP at 84.7 almost continuously and lack of power. At idle CP went down to 490, so I rev'ed it to keep it from stalling, Drove for a couple blocks ICP would not go above 900, IRP still mostly at 84.7.
Parked and shut off, maybe 10 min, Started and everything was fine, drove around town for 10 min, and made another stop. 30 min. Started and there we go again, pulled over, shut off, 30 seconds, start again and everything was fine.
I am convinced that the IRP is sticking OPEN, when the truck is off, the IRP remains Open, start it and it should close to a % determined by the PCM. This is not happening all the time.
I was thinking that it could be the IRP pigtail, since it sees a lot of heat from the drivers side up pipe, but if it was a bad wire this condition would happen randomly as you were driving.
Does this theory make sence to anyone??
Whent for a drive , 2 stops and starts, on the second start, could tell something was wrong, started driving and IRP at 84.7 almost continuously and lack of power. At idle CP went down to 490, so I rev'ed it to keep it from stalling, Drove for a couple blocks ICP would not go above 900, IRP still mostly at 84.7.
Parked and shut off, maybe 10 min, Started and everything was fine, drove around town for 10 min, and made another stop. 30 min. Started and there we go again, pulled over, shut off, 30 seconds, start again and everything was fine.
I am convinced that the IRP is sticking OPEN, when the truck is off, the IRP remains Open, start it and it should close to a % determined by the PCM. This is not happening all the time.
I was thinking that it could be the IRP pigtail, since it sees a lot of heat from the drivers side up pipe, but if it was a bad wire this condition would happen randomly as you were driving.
Does this theory make sence to anyone??
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
Sounds like it's time to fight the IPR valve to me. Check Ebay for an OEM. I've bought a couple there for ~$100 shipped.
IPR (05-07) # 5C3Z-9C968-CA (CM-5126 Motorcraft) 1842428C92 (Navistar)
IPR (05-07) # 5C3Z-9C968-CA (CM-5126 Motorcraft) 1842428C92 (Navistar)
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Lead Driver
Joined: Sep 2012
Posts: 7,833
Likes: 96
From: Manteca,Ca
The IPR could have the screen full of junk or suck in mite want to pull and take a look at the screen, Did you pull the grey clip off the Connection to ICP run the truck and wiggle test? may need to disconnect ICP and run the truck for awhile to rule out ICP.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
I too think it is an ipr or ipr pigtail. Just as a check, Unplug the icp and drive for a while. If it does not act screwy, then it is the icp or icp pig tail. Otherwise, I would check the ipr.
Thread Starter
|
Tuned
Joined: Feb 2008
Posts: 445
Likes: 1
From: Forest Grove, BC
I had the IRP out when I did the STC fitting. I had this condition originally, before I did the STC, dummys and SP's. When I pulled the IRP the screen was clean as a whistle. The kit I bought from ford had a new IRP screen and orings, so I changed them.
Again, the condition I have now is the same condition that started me doing all this work.:
STC fitting, dummies, SP's, All injector seals and orings,
My original problem still exists. although I did see a couple of deteriorating o rings on the dummies.
I have a new IRP on the way, ICP checked ok. When I get home on Monday I will replace the irp and try it.
Again, the condition I have now is the same condition that started me doing all this work.:
STC fitting, dummies, SP's, All injector seals and orings,
My original problem still exists. although I did see a couple of deteriorating o rings on the dummies.
I have a new IRP on the way, ICP checked ok. When I get home on Monday I will replace the irp and try it.
Thread Starter
|
Tuned
Joined: Feb 2008
Posts: 445
Likes: 1
From: Forest Grove, BC
Hi All, Just finished 1000 mile, 2 day trip home, and the dam truck ran perfectly WTF??
No loss of power, no funny readings on IRP &ICP. Lots of starts and stops.
I did pick up two new batts from Costco
I will install my new IRP in a few days and try to do a bit of driving to see if all is well.
No loss of power, no funny readings on IRP &ICP. Lots of starts and stops.
I did pick up two new batts from Costco
I will install my new IRP in a few days and try to do a bit of driving to see if all is well.
Thread Starter
|
Tuned
Joined: Feb 2008
Posts: 445
Likes: 1
From: Forest Grove, BC
I Played around with the ICP pig tail and plug while running. Shut off truck, pulled the ICP plug, inspected it and reinstalled, Started truck, and things were fine. Did that several days ago. The loss of power thing happened again after I did this.
Then a few days after that I made the 1000 mile trip home. I am pretty sure its the IRP sticking open when the truck is started. It always happens off the starting of the truck. Always when the truck is warmed up (That part doen't make sence to me).
I will change the IRP in a few days and post back to give the out come.
Oh there was one glitch, 700 miles into trip home the ABS light came on.. HMM The last time that happened was when the left front wheel bearing calved. They are expensive things. My SG II didn't pick any codes so I will plug in the AE and find the issue. Ill start new thread too.
I want to thank all who has weighed in to help me out, THis Site is the BEST!!!
Then a few days after that I made the 1000 mile trip home. I am pretty sure its the IRP sticking open when the truck is started. It always happens off the starting of the truck. Always when the truck is warmed up (That part doen't make sence to me).
I will change the IRP in a few days and post back to give the out come.
Oh there was one glitch, 700 miles into trip home the ABS light came on.. HMM The last time that happened was when the left front wheel bearing calved. They are expensive things. My SG II didn't pick any codes so I will plug in the AE and find the issue. Ill start new thread too.
I want to thank all who has weighed in to help me out, THis Site is the BEST!!!
Lead Driver
Joined: Sep 2012
Posts: 7,833
Likes: 96
From: Manteca,Ca
A graph of ICP, ICP desired, ICPv and IPR. You should be able to graph and log all 4 at the same time. At some point you'll see ICP desired above the ICP actual for an "extended" period and the P2290 will set. I don't remember the exact time that it takes to set the code, but it's not long. Certain tunes will also set the code if the ICP desired is above what the HPOP is capable of and you'll have nothing mechanically wrong with the truck.
The PCM has a desired ICP value it's looking for under a particular set of conditions (load, speed, etc) The PCM opens and closes the IPR valve to satisfy the demand for ICP that it's looking for. If the desired ICP value is not reached in a set time the P2290 code is set.