Hello! This is my first post here! I bought an 03 6.0 about a year ago and have had nothing but trouble with it so far. It was in the shop getting injectors and getting deleted, and finally after 3 months and a bunch of bs later I got it back. Ran great for a while and decided to do an oil change last week with t6 5-40 and archoil additive. Ever since then I’ve had way less power than usual. I had a code on for the icp voltage being to low and ebp sensor low as well. Replaced both and the pigtails and ebp tube and still have the same icp reading. Key on engine off I get .14v and at idle I get .30 volts.... no change after replacing the sensor. Starts up and runs great but has way less power and still the code. Any ideas of what to try next? Icp pressure at idle is mid 700s which seemed normal to me. Kinda stumped and would love some help lol. Thanks! This all started after the oil change. Was running great before that.
-Tanner

 

Your 03 doesn't use the EBP sensor most likely. That was a result of a computer update way back in 06, that your truck almost certainly received.

 

If it starts up then you have 500 psi+ actual ICP pressure, and that does not correspond to 0.3 volts.

Did you install an aftermarket ICP sensor?

 

yes I did. The voltage was the same on it before replacing as well. Made absolutely no difference. Replacing the ebp sensor and tube made the code for that go away though.

 

The PCM still doesn't use it, but I'm sure it is better to have the code cleared.

What are you using to take the readings?

 

I’m using my sct x4

 

Personally, I would try another scan tool to read those numbers. ForScan on a smartphone is VERY affordable, even with the OBDII adapter.

 

ill check it out. Was also wondering if maybe having a bad ipr could throw the voltage out of range and act weird. I know there is some correlation between the 2 and was curious.

 

The IPR is a control valve. It closes (PCM commanded) to isolate the high pressure oil system so the pump can develop the pressure, and it dumps oil from the high pressure system to reduce the pressure.

The ICP is simply the pressure measuring device.

 

I gotcha. Well I figure since it starts, especially easily. No long crank or anything, that it’s building pressure fast enough and I am 100% sitting at above 500 psi. Maybe I just need to follow the wires up the harness and make sure nothing up higher is chaffed or anything. I guess if that doesn’t work I can replace that sensor with a new one and make sure this one isn’t faulty out of the box.

 

That would not be a bad approach either. Since you replaced the pigtails, I assumed that you may have already checked that out.

 

does that Icp tie into the injector/ficm harness? Do they make a complete replacement harness for it that I can buy

 

The ICP wiring is part of the engine harness.

 

This happened immediately after an oil change? What brand oil filter did you use?

 

motocraft oil filter and cap. Rotella t6 oil and archoil additive