I've been having trouble for a week now. Stopped truck to fill up and it would not restart. Towed it home and it would fire after some very fast cranking. Acted like it had no fuel. Fires this way every time. Had a p0603 and p1211 code. Also had low voltage. New alternator and icp sensor. still same problem. Once truck has been run and warmed up if it shuts down it will not restart. No other codes are pressent. Passed buzz and all other tests my buddies scanner would run.

 

Check the ICP pressures and Duty cycles when cranking...

 

I'm assuming check those with a scanner hooked up. I'll have to get it back. I understand the IDM converts dc to ac to fire the injectors. If I check the center pin wire of the uvch back at the IDM I read 4.9 v of dc. no ac. Don't know if that means anything or not.

 

If it runs at all its not your IDM...

Sounds like an IPR, but its hard to say without some numbers...

Duty cycle when cranking and ICP pressures.

 

A couple months ago I had the issue of it was hard to start cold but once it was running it was easy to start. Anything over idle it would shut down. Took out ipr. tore it apart and clean it per a service write up I found on here. Changed oil and truck ran good. Any luck with servicing these? Should I just buy a new one.

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Until I get the computer again this is the best I can do. Found a volt chart for the ICP for pressure. I am getting .5v while cranking on the only wire that was varying which equates to 300 psi. Does an engine require more or less pressure when warm. After idling for a half hour or so it started loping real bad till it shut down and would not restart.

 

truck will not fire the injectors without more then 450psi...

 

Fired up just fine today after sitting. has around 750psi at icp. as oil tempurature came up the pressure slowly dropped off till it was a lil under 500 and the truck acted like it wanted to stall. Shut it down and would not restart. Changed oil which had around 2500 miles on it. While canking i am getting just under 400 psi at icp. any possibility its the pump not the regulator before I buy one. truck runs good once it fires.

 

id pull the valve covers and fire it up and look for oil squirting out somewhere..

 

Am I looking for injectors to be leaking

 

yes, and the reason i say this is because when the oil is cold its thicker and doesnt bypass orings as easily but once it warms up it wont make minimum hpo to fire.