97 psd ICP problem

[cap20]

I have a 97 f-350 PSD running rough and it is throwing a p1211 code , so I searched to find the cure. I found out the icp could be cleaned and put back together , this I did and purchased new o-rings for the end and re-installed . It still runs the same and still pulls the same code.does any one know how to check the coil or "solenoid" pack ? Or what else might be the problem ?

[Patrick Feeley]

Only real check for the coil is to make sure it is not open circuit and that the retaining nut is snug so the coil is not moving around. Just a note: that part is the Injection Pressure Regulator (IPR) valve. The Injection Control Pressure (ICP) sensor is on the drivers side head top edge towards the front leaning inward at a 45* angle. Cheers!

[cap20]

Thanks for responding ! Yes the 1211code said. ICP press. above/below desired. Faulty inj. Pres. Reg. Valve so I went to that. Could it be as simple as a bad sensor ? Can I check the sensor ?

[FurbyPower]

Look at the connection of the ICP sensor. If it is covered in oil then most likely the sensor is bad.

[cap20]

Thanks ! Some one else said that, and I checked it but no oil at all. Is that the only way to check for a bad sensor ?

[FurbyPower]

If it runs better with the ICP sensor unplugged then it is probably bad. When unplugged the truck should use predetermined ICP values and it could run better as a result. If not it looks like you could have a IPR rebuild in your future.

[cap20]

Ok thanks for the info !

[BigFuel]

Cap, how are you with in-depth electrical diagnosis? Back-probe (do not puncture the wires) to do all testing. More time involved (but cheaper then shotgunning parts) but this issue is not always due to a faulty part but to the wiring as well.

[cap20]

That is awesome ! Thanks! That will definitely help. Thanks again