Have a 03 with a 7.3 in it. Truck was running great did a lot of work to it 2 months ago for codes. Was left with just P1316 for injector codes. Truck was run fine yesterday and went to pull out of the drive. Truck just died and won’t restart. Pulled all the codes and found P1670 for no communication to from idm to pcm. With P1212 and P1211. To start the ICP sensor was replaced and CPS when it was repaired a few months ago. Checked to see if oil is ok in the HPOP and found to be full. Have seen a lot of talk about IPR valve failing and the IDM as well. Look for ideas and help.

Thanks.

 

Can you monitor engine pids with whatever tool you're using to pull codes? If not check the tech section at the top of this forum for information on the forscan app. If you can you'll want to bring up IPR and ICP pid's to see what injection pressure you're getting while cranking. Fuel pressure test is never a bad idea there's also a write-up in the tech section for an easy method using the fuel bowl drain valve as a temporary test port.

 

Went ahead and used the fuel drain as my test port. Pressure was 50psi with key on. Using an SCT X4 tuner checked ICP pressure. It cranked at started normal. ICP reading 550psi and fuel at 75psi idling. Cleared codes and left running to see if codes come back or can see if IPR is inter mitten. Could the IDM just being having random hiccups causing this issue.

 

Electrical issues can most defiantly cause intermittent IPR problems, it's the most common IPR issue we get. The valves are actually kind of a dead end in the oil system so eventually they accumulate some gunk that has to be cleaned out. That's where the videos come in.

 

Ok i’ll have to get to removing the IPR valve and check it out. Might end up replacing it while i’m in their. Seen a few videos talking about the connecter going bad. Will see if needs to be replaced. On a side note. Is their a good scanner that will allow me to go a injector buzz test. I had injector rebuilt last year and have never gotten P1316 to go away. Wanted to see if i may have a faulty injector for that code.

 

There are write ups in the tech section on Forscan explaining how to's, which dongles work plus the charting tool for graphing your logs to get a visual representation of the data. The app is free for PC and $5 or $6 for Android. It really is the best option available for diagnostics and testing. If the PCM can see it so can you w/the software. Also preforms all tests available for our trucks.

 

Groke7.3,
Welcome. You might consider unplugging the IPR to help verify the culprit. The PCM will use a default setting to allow the truck to continue running. Also, once out it’s an easy disassemble/rebuild using a few o-rings vs the cost of a new unit.
Keep us posted.

 

The truck will run on default tables with the ICP disconnected (pressure reading). The IPR (pressure control) must be connected.

 

Now that I think about it I believe it’s the sensor on the DS head that can be disconnected. If so, I stand corrected. Before retirement I made a round robin trip from East TN to AR and TX with the sensor disconnected at the suggestions of FTE and a local diesel shop. Worked fine, returned home and replaced sensor.

 

Yes it's the pressure sensor in the drivers head(ICP) that can be disconnected for diagnostics. The fact that it can be disconnected and the engine still run means it can't cause a no start, and the reason I suspect the IPR or it's wiring.


This is the best teardown video I've found


This one is good for the walk through he gives.

 

Well it was running good for a week back to the same symptom. This time i think i was able to narrow it down to the IPR being faulty. It has low pressure readings at the ICP pressure when cranking. At 211PSI. Also had code ICP pressure being low at start up P1212.

 

Unwrap the pigtail harness for the IPR a good 6-8 inches and look for signs of damage. Wire damage is very common there and a new pigtail is a lot cheaper than a new IPR.

 

GRoke73,
Did you test if the IPR sensor in the DS head was good or bad or did you install a new one? If a new sensor was it a Ford part?
Simply spraying the IPR with brake cleaner may not be a “fix” as there are small/tiny parts and holes that may be trapping debris.
Certainly thoroughly check wiring as suggested above.

 

Checked the wiring. Connector needs to be replaced. Tested voltage and has 12 volts key on and when cranking. When IPR is unplugged ICP pressure is only at 195PSI. When its plugged in its at 211PSI. Going to purchase a new IPR valve, and try again.

 

Got around to finally replacing the IPR valve. Primed the oil and fired right up. Shortly after it began fuel knocking horribly. Found code P1219 CID low. Ive also always had since I got the truck P1316. Possibly could the IDM finally just go bad causing this issue. What test can be done to solve this issue.