Hey all,

Anyway, I was working on a buddies 00 F-350. He was complaining that his truck ran fine cruising but had no power when towing or floored.

Anyway, he came over and I ran my AE on it. I thought it might be the back pressure valve. Anyway, while monitoring the vitals during a drive, I noticed his ICP pressures were kinda low. At idle, they were around 400 psi. At wide open throttle they only got to 1100 psi at a 65% duty cycle. As soon as he'd let off, the pressure would spike to 3500 psi and the duty cycle would drop to 10%.

I unhooked the ICP sensor and we reran it. At idle, the ICP readings were about 750 psi now. Floored the pressure was 2400 psi at a 35% duty cycle.

So, I'm pretty sure the truck needs a new ICP sensor. All I'm asking is if there is anything else that could cause this. Unhooking the sensor made the ICP values more reasonable.

Thanks in advance.
Ryan

 

This is why I love this site. 51 views and not a single response.

SWEET!

 

Did the truck run better (test drive) with the ICP sensor unplugged? If so, replace the sensor and retest. The AE is reading the default settings and not the actual pressure. Therefore if it runs better with the ICP unplugged (can't read ICP), the IPR must be adjusting the pressure and is functioning ok.

 

If you are unhooking the ICP sensor how are you getting pressure readings? When you unhook the ICP you are telling the PCM to use default settings like it would for a failed sensor.

The ICP sensor only reports the pressure. Sounds like he has something wrong with the IPR, hpop, or high pressure oil leaks.

 

Check voltage on the icp sensor. Start there and continue forward from there..

 

Sorry for being a smarta$$ earlier. Been dealing with some personal issues as well.

Anyway, I think the truck ran a little better, but it still felt slow. Course it's a stocker and I'm used to driving mine which is closer to 400 hp every day...

Is there a voltage I can measure for the ICP sensor with my AE? There was absolutely no oil in the ICP sensor plug.

Is there any test I can do to see about the IPR? It's weird that the pressure stays low, but the duty cycle climbs up to 65% than when you let off, the pressure spikes to like 3500 psi.

All advice is greatly appreciated.

 

Look in the drop down menu of your Live Data Meters. You should see a parameter for ICP Volts and should see it varying as rpm/load changes. IIRC, the engine at an idle will die when the IPR is unplugged. I would monitor ICP Volts, ICP Pressure, and ICP DC %. All should be changing together. If the ICP pressure is actually reading low and the DC % is increasing, the IPR may be sticking. The pressure spike seems to indicate the IPR is capable of fully closing (100% DC). The PCM needs to read the correct ICP pressure to make adjustments accordingly. Can you swap an ICP sensor from another truck and recheck the volts/pressures?

Name/ Circuit #/ Wire / Color / Key Off/ Key On/ Low Idle/ High Idle / Operating Range / Comments
ICP / 812 / DB/LG / 0v/ 0.2v- 0.4v/ 1v/ 2v/ 0.1v-3v / Injection Control Pressure Sensor (Min 0.83v req. for starting)

 

I am sorry I am one of those who viewed but I have no idea how to help answer your question. But I am following this tread to learn. I don't want to be one of those guys that post up answers without having a clue But as you see the guys with answers and experience have come though to help you out.

 

Well, I swapped the ICP with another truck that I know was working and the problem still existed.

So, I guess it could be the HPOP or the IPR????

Is there a way to test either of these without taking it to Ford?

 

Does your buddy have a fuel pressure gauge or has he completed the in tank mods? Without fuel to "intensify" ICP can create some awkward readings, probably a stretch, but a possibility.

 

When you had the icp out, was there oil in the rail? And theres a Alan head crew ontop of the high pressure oil resivore, front and center. Remove the plug and oil should be within 1" to the top. As far as the ipr, need to hook it to a computer to data log things. Do you have scan gauge?

 

No, he does not have a fuel pressure gauge and he has not done any of the fuel tank mods. I'll see if we can track one down. I guess the AE doesn't read fuel pressures from what I've been told.

 

Yeah, oil ran out of the head when we pulled the ICP sensor.

I have an Auto Enginuity. I ran Engine RPM, ICP Pressure and Duty Cycle. The ICP never got above 1200 psi wide open and the duty cycle just kept climbing until it got to 65%. When we let off the throttle, the ICP spiked to 3500psi then fell off back to 750 psi when the truck was idling.

 

Correct, Fuel pressure is not read by the PCM so it is not visible in AE

 

Without bein able to deadhead the pump I can't pinpoint and say it is the hpop... Sounds like it or the ipr. Hope I've helped!