Hello all, Never mind my user name I think I created it about 10 years or so ago. I have had my truck for a little longer then that.

I am having some performance issues. This has come on over time and has gotten progressively worse over the last few months. To the point that I now have to hold the peddle to the floor when going up hill and still am barely able to maintain my speed. Got and Elm327 Bluetooth adapter and purchased Torque Pro. I am able to read my ICP, IPR etc... Here is what I see, at WOT and going uphill it shows ICP about 800 and IPR at 94%. Also have long starts, take about 3-4 seconds before the ICP pressure even begins to build, even when having been just shut off.

Now I have done allot in trying to figure out what is going on, I will run through that here:

• Unplugged my Hydra tuner. Everything below and the performance number above all from stock no tuner attached.
• Replaced ICP and IPR with new Motorcraft. After replacing IRP I have not see it register above 64%.
• Inspected wires and harnesses for issues.
• No visible leaks.
• Dead headed the HPOP and each oil real individually as well as all together with a manual 5K PSI gauge. Every test showed 3900PSI. (I replaced the HPOP about 2 years ago with a Bosche reman) Unplugged the valve cover harnesses during the testing to make sure the engine would not start.
• Replaced EBP sensor and cleaned the tube.
• Checked fuel pressure. I had upgraded the spring in it about a year ago. If found it was pushing 90PSI. I know that is high so I put the old spring back in and it is back down to the 60 range now.
• Did the air test into the IPR port. didn't find any air leaking from the injectors but after about 10min of 120PSI air i would start to get air bubbling into my HPOP reservoir. Not sure if that is an issue. I talked to Dieselsite and they didn't seem to think that was an issue. Said that pumps aren't air tight.
• Unplugged the ICP and test drove. Noticed when going up hill WOT the PCM was showing 2400 on the ICP even though I was only getting 800PSI. I assume the 2400 was what the computer was requesting but I never get that in that situation.
• HPOP res was draining down over night. That seems to have stopped after replacing the IPR. Not sure if that even makes sense.
• At the start of my performance issues I pull all the injectors inspected them and installed new O rings on them. (about a year ago)

My truck is mostly stock. The upgrades are gauges EGT, Boost, Trans temp, and Fuel. Upgraded air filter can't remember the name of it but it's the big round filter, and the hydra tuner. I have only hand moderate tunes nothing crazy mostly for towing.

Any ideas? I feel like I have exhausted just about everything. I must be missing something. I want to say pump, but I am told it is performing above expected results hilling 3900PSI when dead headed. Maybe the injectors? They are stock and the originals.

Thanks for the help!

 

Oh a little more information I just thought of: At Idle the ICP ranges from 500 up into the low 600s and IPR around 10% sometimes lower (I think when it's cold). I also checked the low oil pressure. I installed a sensor on the port on top of the HPOP res, when cold it registers at 40PSI and then when warmed up its at about 20psi. I can't remember how fast that pressure builds when cranking. I did verify it takes about 4 seconds of cranking to get ICP to start climbing, as soon as it hits 500 it fires right up.