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Tried starting the truck, fired ran good for a couple seconds, then ran extremely rough for a couple seconds then died.
I did some research and changed the ICP because there was oil in the connector so even if it wasnt causing my issue i wanted to replace it.
Now I have the same issue but it will actually run a little longer and not stall. I thought it was fixed so i took it for a drive, after about 3 miles it bogged down and i was able to make it home with half throttle going about 30mph. Sounds almost like its running on half the cylinders. i unplugged the ICP and it continued to run that way.
I had done the 50cent mod a few years back with the peices from ford but i know the harnesses themselves can wear through so i checked the resistance between the center pin and the two pins to the right and left for both the injector harness and they had about 3ohms.
I am leaning towards an IPR but from the reading i have done it seams like most trucks will not restart after they die. I have AE so i am going to hook it up later today, just wanted some reccomendations on what to look at.
I also remember when i shut it off the unplug the ICP to see if it would clear up the needles on the gauges did a full sweep as if i disconnected the battery which i though was weird.
Tried starting the truck, fired ran good for a couple seconds, then ran extremely rough for a couple seconds then died.
I did some research and changed the ICP because there was oil in the connector so even if it wasnt causing my issue i wanted to replace it.
Now I have the same issue but it will actually run a little longer and not stall. I thought it was fixed so i took it for a drive, after about 3 miles it bogged down and i was able to make it home with half throttle going about 30mph. Sounds almost like its running on half the cylinders. i unplugged the ICP and it continued to run that way.
I had done the 50cent mod a few years back with the peices from ford but i know the harnesses themselves can wear through so i checked the resistance between the center pin and the two pins to the right and left for both the injector harness and they had about 3ohms.
I am leaning towards an IPR but from the reading i have done it seams like most trucks will not restart after they die. I have AE so i am going to hook it up later today, just wanted some reccomendations on what to look at.
I also remember when i shut it off the unplug the ICP to see if it would clear up the needles on the gauges did a full sweep as if i disconnected the battery which i though was weird.
Since you have AE, see what ICP PSI and IPRDC is when it stalls or fails to crank. That will be a clue as to whether it is the IPR or something else oil related.
The trucks will start again and run for a while at times if the IPR is bad. It simply has to cool off. Another thing to try is dumping some ice water on the IPR when the engine stalls and then immediately try to start it again. If it runs then that is another clue. Canned air turned upside down and sprayed onto the IPR will also work.
The fuel pressure test that the others have recommended is also valid.
Based on the description, it definitely sounds like one of the three mentioned, IPR, UVCH's, or fuel pressure so I think all the normal bases are covered. My vote is for the fuel pump getting very weak and on it's way out.
I just hooked up a new isspro fuel pressure gauge, I used the port on the fuel bowl which is before the filter. Just to mention the truck has only stalled once, all other times it runs extremely rough with no power.
I took it out for a ride this morning, at idle and under throttle it had 60-65psi. After about two miles the condition happened again but fuel pressure maintained the same.
I have done the 50cent mod with the Ford pieces, but maybe the harness is worn through.
Is there anything with the exhaust back pressure sensor that could be causing this condition? could one bad injector be the issue?
Just hooked up AE. With it running good at idle the MAP matched the EBP at about 15psi.
The IPR was at 750 and 15. Dont remember which was psi and which was duty cycle. The problem is it was running well so i should probably look at reading when it runs rough
Is your ICP disconnected the value you show looks like the default when that happens. And the IPR% looks high should be around 10-11. You may have an oil leak somewhere possibly injector orings. Search for the "Cody test"
I reconnected my ICP and got it to run rough. At idle the ICP psi was 690 and went up to 2000 at half throttle which only got me to about 20mph. The IPR duty cycle was the same at 14.45.
It threw a check engine light this time and i received a P0113 intake air tem circuit high which i think is there because i have an aftermarket air filter. It also had P1316 injector driver module codes detected.
If the IPR stayed the same during the run the IPR is stuck open. Have you rebuilt the IPR if not now would be the time. Is the tin nut still on the IPR solenoid?
I have not rebuilt the IPR, I am leaning towards the UVC harness because it is so intermittent and it will run completely normal then rough, and because of the injector driver code I got.
I did a buzz test and it said injector 7 circuit (cant remember if it was high or low). Pulled the valve cover and gasket and everything looks good. I will replace them anyway since i have to put it back together anyway and i have read other threads that had bad harnesses without visible damage.
AllaboutMPG messaged me and recommended I look at the wiring block the IDM goes into on the drivers side valve cover. After I removed the air filter I noticed a smudge / burn mark on the valve cover. After I unscrewed the connector I could see at least one wire worn through.
The only thing that is unfortunate is I already removed the valve cover and harness and ordered a new one so I am going to wait and put it all together at once so I will not know what was the correct fix.
Here is the diagram for the 42 pin connector. The wire that was rubbed through is the tan/red wire which is injector 7 which is the injector i got the code from after the buzz test.
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