Are you absolutely certain about that? You have been the owner of the truck since new?

 

14 years now but not since new. There’s nothing to indicate anything had been done to it with internals, etc. it was originally a Florida truck and taken care of by a local dealership throughout its single-owner life there.

 

Maybe send a copy of your tunes off to Jody at DP and see if they are for single-shot.

 

I’ve had the tunes and tuner for 11 years. I looked at the order I placed and there were no modifications beyond the 4” exhaust listed. Never had any problems with it until earlier this year.

 

The only way for us to help you is to log some PIDS with forscan as mentioned in post 57. We need to watch the numbers when the truck is acting up.

 

Here is the requested file. Sorry, I’ve been juggling working on the truck and racecar this week. Looks like the IPR value only changes from 11.33 to 11.72 when I was driving up our big neighborhood hill. Is that normal behavior from the IPR?

 

Here is the Excel file instead.

 

Unfortunately I can't open the files on my phone but I'm sure someone will be a long shortly. To answer your question the IPR duty cycle should increase much more than what you are seeing depending on how much throttle you are giving it. How was the truck running when you were going up the hill?

 

It runs relatively normally all the time now. It sounds a little off off-throttle but otherwise pretty normal. But keep in mind that I haven’t run this beast on the stock tune in probably 11 years. It’s also been a long time since I heard it run normally but I’m starting to be ok with it as is. But if the IPR is bad, I can replace it again.

 

This is some pretty strange data. IPR% is stuck at 11.33%.. ICP starts around 2000psi and then jumps to 3000psi and stays there. PW looks like single shot injector values, though that might be the PCM trying to correct for crazy high ICP. In fact, the PCM could be holding IPR% at idle, given ICP starts so high.




Where did you purchase that Motorcraft IPR? There have been some fakes out there. Do you still have the plastic bag it came in? Spelling mistakes are a clue that the IPR is fake.

Check the IPR wiring for opens, short to ground and short to power, between the IPR connector and the PCM connector. You could check it from IPR to 42 pin connector first to rule that part of the wiring out.

If that checks out, the IPR itself is the next cheapest item to change. Sounds like it might be questionable given the feedback you have seen from where you purchased it.

 

If everything is stock, I would pull the chip out and then do some diagnosis and repair. Get it running properly without the chip, then put it back in. You'll probably not recognize the truck after that because it will be a whole new level of stallion that you never knew was there.

 

Yeah wow that ICP jumping up and staying there is very odd. If the IPR turns out to be genuine Ford, it might either be a lemon or there might be contamination jamming it.

What kind of racing do you do?

 

Thanks, all. I bought the IPR on Amazon after several people said they thought it was legit due to the correct language on the bag. I didn’t keep the bag from mine so I can’t confirm one way or the other, but since then the reviews have turned negative. My guess is it was a fake, but I also want to confirm that it isn’t the ICP that’s causing the PCM to hold the IPR at 11%. Any way to do that?

For the possible wiring issue, it did similar things with the other wiring harness, but I did not run these exact tests to prove that. But I don’t think wiring is the issue.

What should be the next step? I can take it to a local diesel shop and let them diagnose and spend my money trying or I can do more myself. I just don’t want to keep trying new parts (again) if there’s something else wrong at the core - like the PCM.

As for the racing, I have a C5 Z06 that I have set up for autocross, time trials, and track days in general. Been doing those for about twenty years. I also do some wheel to wheel racing in 24 Hours of Lemons around the Southeast.

 

Hmm, umplugging the ICP sensor takes the PCM to a default value but I do not know if that is low enough to raise the IPR duty cycle. Maybe remove the ICP and plug the hole in the head? Then crank for a really short period.

Nice! Which sanctioning body do you usually run with? I'm in SCCA Formula Continental.

 

So the 11 percent IPR you are seeing is what the PCM is commanding the IPR to do. I don't know why the PCM isn't commanding the IPR to increase with added throttle but being that your ICP is acting wonky also I would disconnect the ICP and make the same run up the hill just to see how it compares. If the ICP is telling the PCM that it already has enough oil pressure , the PCM is not going to command the IPR to open . Did you get the ICP sensor from Amazon as well? Hang in there, and I wouldn't take the truck to a diesel shop as you are just going to be paying them to throw parts at the truck anyways, most mechanics now days don't know how to diagnose these trucks the just break out the parts cannon...