97 powerstroke rough idle?

[acleadingham]

I recently bought a 97 F-250 with 7.3, and i know very little about the truck. The motor is stock. The problem with the truck is it has a rough idle and it lopes badly when you start it. This is only when its warm. It cold starts excellent. I plug it in at night, and the glowplugs are on for maybe a second or two and it fires right up. As it warms up it starts to get a little rough. But as soon as you give it some fuel it smooths out and runs great. I have changed all fluids filters etc. really like the truck as its my first 7.3 but cant stand to have trouble right out of the gate..any help greatly appreciated.

[BigFuel]

Get it warm, shut it down, pull the ICP harness off the sensor and fire it back up. Does it run smooth now?

Looking at the engine while standing on the bumper put your hand on the round black fuel filter cap. Bring your hand towards you till you get to the metal square-ish dome (high pressure oil pump sump). Move your hand to the right and put your hand on the (left/driver) valve cover. Just to the left of your hand is a sensor screwed into the side of the head. This is the ICP sensor. It tells the PCM what pressure the high pressure oil is sitting at. If you disconnect it the PCM will assume a standard voltage. Don't drive like this, we just want to see if your issue is on the fuel side or oil side.

[acleadingham]

Did exactly as you described and no change at all also changed oil in the hpop to see if that helped but still no change.

[BigFuel]

Hey, ok there has been a nasty rash on here with plugged FPR screens. I'm still at work and all I have is my iPhone but use the search above and just type in FPR screen clean. Aught to come up for ya. Really sorry I can just get you the link.

The FPR is the Fuel Pressure Regulator. It has a screen to protect it from stuff junking it up which in turn junks itself up and restricts fuel flow to the injectors. Simple proceedure and just need a 10 or 11 mm wrench.