rough idle no power
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rough idle no power
So I bought an early 2003 with a 7.3. Monday I started the truck before heading to work. It idled 10-15 minutes before I got in and made the 5 minute drive to work, half way there it started running rough and lost power. My programmer wouldn't pick up the code. Neither would Auto Value's, I did some google work and I unplugged the IPC sensor and it smoothed out and ran well...for 15 minutes, then it went back to running rough. I worked through some things, changed the fuel filter started it and it ran fine for like 5 minutes I thought I had it fixed stepped on the nerf bar and it started running rough again. I dropped it off at home and changed vehicles. On Friday I tried to pull it up to the garage and it wouldn't start. I replaced the IPC sensor with the MotorCraft brand. I have had the truck for 2 weeks it has 148,000 miles. I took off the inter cooler lines and cleaned them, they were not dirty. Very little oil residue.
Got Data?
Joined: Dec 2012
Posts: 4,250
Likes: 1,382
From: Lake Stevens, WA
Hi there and welcome to the site. I see the SES light is on - let's get that code or codes. It's pretty simple with a Bluetooth OBDII dongle (android) or Wifi dongle (iOS) and the TorquePro or Forscan app for your phone. See OBDII Tools link in my signature.
It would be good to check your fuel pressure. Screens can clog and pickup foot drop off. Hutch mod for the tank pickup is a must-do for these trucks to eliminate this fuel issue. See the following how-to thread from our tech folder: https://www.ford-trucks.com/forums/1...l#post19216921
Good call on using ford sensors - other brand sensors have been unreliable.
How are your fuel and oil levels?
It would be good to check your fuel pressure. Screens can clog and pickup foot drop off. Hutch mod for the tank pickup is a must-do for these trucks to eliminate this fuel issue. See the following how-to thread from our tech folder: https://www.ford-trucks.com/forums/1...l#post19216921
Good call on using ford sensors - other brand sensors have been unreliable.
How are your fuel and oil levels?
Hotshot
Joined: Jul 2008
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From: N.GA Mountains
You can check fuel pressure by adding a piece of 5/16” hose and any cheap 100psi pressure gauge (from hardware store) to the fuel filter water drain valve. Make hose long enough to route it up to behind s windshield wiper or rear view mirror - so you can see it while driving.
Should be ~54psi and steady under sustained hard acceleration.
Should be ~54psi and steady under sustained hard acceleration.
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Codes are P1280 Injector Control Pressure Sensor, P0472 Exhaust pressure sensor low input, P1316 injector driver module (but I did unplug this while it was running during troubleshooting.
Thanks for the help. I am going to replace the fuel filter and do the tank pick up mod
Thanks for the help. I am going to replace the fuel filter and do the tank pick up mod
Logistics Pro
Joined: May 2017
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From: Muskogee, Ok
Are you sure you unplugged the IDM while it was running? It's very hidden in the inside of the fender well, I can't even see any bit of mine without removing the fender liner. Unplugging it while running would instantly kill the truck, and possibly damage the IDM or PCM. What did you actually unplug?
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Are you sure you unplugged the IDM while it was running? It's very hidden in the inside of the fender well, I can't even see any bit of mine without removing the fender liner. Unplugging it while running would instantly kill the truck, and possibly damage the IDM or PCM. What did you actually unplug?
Circled plug
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Hotshot
Joined: Jul 2008
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From: N.GA Mountains
That is IPR. Won’t run with that unplugged.
You cam unplug the ICP sensor and see if there is oil in the plug and/or it runs different unplugged.
You cam unplug the ICP sensor and see if there is oil in the plug and/or it runs different unplugged.
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yeah I did that and replaced the ICP, the problem persisted. Changed the fuel filter. I did the tank mod yesterday and I retorqued the R side injector hold downs and did the 50 cent mod on that side too. I am waiting on parts from riff raff. Hopefully they come soon and I’ll finish putting the inter cooler pipes in and give it another shot.
Got Data?
Joined: Dec 2012
Posts: 4,250
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From: Lake Stevens, WA
Some interesting discussion on this topic of re-torquing, or "hot-torquing". In my quest for a quiet running truck, I will be trying it, understanding the results will be subjective.
https://www.ford-trucks.com/forums/1...om-ford-3.html
https://www.ford-trucks.com/forums/1...om-ford-3.html
Laughing Gas
Joined: Oct 2008
Posts: 1,106
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From: Kansas City KS
You can check fuel pressure by adding a piece of 5/16” hose and any cheap 100psi pressure gauge (from hardware store) to the fuel filter water drain valve. Make hose long enough to route it up to behind s windshield wiper or rear view mirror - so you can see it while driving.
Should be ~54psi and steady under sustained hard acceleration.
Should be ~54psi and steady under sustained hard acceleration.
good one there Jason, that's the easiest, quickest and cheapest way to check it.
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I haven't checked the fuel pressure yet but I pulled the IDM and checked the ohms on all the plugs. 2.8-3.6 Ohms on all the pins. I did buy a second IPC sensor just to see if the first one was bad. If the fuel pressure checks out what the next thing to look to? Will the cam position sensor throw a code it if is bad? What are the odds that the IDM is bad?