[Rdavis006]

03 f250 7.3. If truck sits for several hours it will start run really rough for 15 to 30 seconds then dies will not restart till it sits for few hours. Oil change and few filter two weeks ago oil level is fine. I have unplugged the icp no change. Tinner nut on ipr is tight. I do have forscan not sure what i should be checking any help would be appreciated.

 

[Jax]

I do have forscan not sure what i should be checking any help would be appreciated.

Phone or computer? Do you have a reader?

 

[Rdavis006]

Forscan is on computer have already looked and there are no codes

 

[Hendy]

Have you checked the oil level in your hpop? maybe a weak lpop is causing this issue.

 

[Rdavis006]

Yes hpop is full

 

[Jax]

Forscan is on computer have already looked and there are no codes

You plug in your reader and make sure it is connected to the computer.
You open Forscan. What profile does it offer for your truck?
Do you run all the Key On, Engine Off (KOEO) tests?

Impossible that it would not have some codes.

 

[Rdavis006]

It does not having any codes other than one for a wheel speed sensor that is irrelevant.

 

[Jax]

Check your connections al the way to the PCM. If nothing is wrong, your PCM should be tested.

 

[Realdann]

Bad IPR coil? Had one that would start and run as no issue. Stop truck and for just 15 mins and it would restart. Try to start after 30 mins and truck would not start. Had to wait till the engine as pretty much cool. Then it would restart.

Leaking oil orings around the injectors will drain down HPOP oil standing around the injectors. When you go to start the truck the HPOP has to fill the oil chambers around the injectors with oil first to build up the high pressure and the engine would stumble for a moment. For me this would happen when the truck sat overnight for the morning start, especially if I towed the previous day. Using the truck during the day was not enough time for the oil to drain down. You can test for leaking by attaching a hose to the HPOP ports in the head. Wire the hoses in a vertical position and fill each hose to the very top. Check the level in the hoses after a few hours. Low oil level in hose signals that head has a leaking injector.