P2291

Jonnydime · Sep 22, 2015

Rail Pressure Sensor?

fbilly420 · Sep 22, 2015

Well no fuel from glow plug holes. I'm going to pull the valve cover and just replace FRP sensor.

Dzchey21 · Sep 22, 2015

Could be a sensor for sure but I think its the injectors

One thing that Webb06 did was remove the injectors, turn them upside down and hook the lines up and crank the engine and see if any fuel came from the nozzles or not. His had rail pressure but they were dry when they were being attempted to fire. Something hung up internally on them.

fbilly420 · Sep 22, 2015

I performed glow plug mist test. Basically remove all 8 glow plugs, unplug both 15 pin connectors and crank motor 3 times for 15 seconds. See if any fuel comes from glow plug holes. All 8 are dry. Rules out leaking nozzles. I just picked up new FRP sensor.

Dzchey21 · Sep 22, 2015

The injectors can still bypass internally tho.

fbilly420 · Sep 22, 2015

I installed new FRP. Will put some things back together tomorrow and see what happens. If i doesn't read anything tomorrow i'm pulling injectors.
Thanks for the replys

fbilly420 · Sep 23, 2015

Well new FRP she fired right up. I hope this thread will be helpful to someone in the future. FRP sensor is a lot easier and cheaper to replace. LOL

Dzchey21 · Sep 23, 2015

Don't see them fail often, good find there. and you are right its much easier to change.

I had one sensor fail on my black truck right before dpc, same kinda deal.

Do you think the HPFP failed to begin with then? Or do you think it was the sensor the whole time? Did you send the old pump back?

fbilly420 · Sep 24, 2015

I think it was sensor all along. Yes pumps went back to Ford parts dept.

DEEZUZ · Sep 24, 2015

I wouldn't say your in the clear yet... But I hope all is well, keep us updated

Dzchey21 · Sep 24, 2015

That was my guess. I bet the original pump was probably fine.

fbilly420 · Sep 25, 2015

The one thing I did notice with new FRP is KOEO voltage. The old sensor read .37 volts new sensor KOEO .50 volts. That is what leads me to believe it was the sensor all along.