P1211 code problem? air in return fuel.

[ajamesm]

I have a 2002 F250 with 325,000+ miles. The problem I am having is that it keeps throwing the P1211 code. The dealership mechanic says that he keeps getting air in the fuel in the return line when he checked it out. Last year it got 6 new Ford Injectors and the other two previously replaced injectors got new o-rings(at the dealer). It also just got a new HPOP and regulator(also at the dealer), which actually helped this problem, but did not cure it. I am assuming with the new HPOP that the new higher pressure is somewhat making up for it a bit.



***Before the new HPOP, when under semi-hard acceleration it would throw this code, either in stock programming or with the high performance programming. After the new HPOP, it is very hard to get it to throw the code in stock, but will still do it in performance. ***



If anyone has any ideas as to what is causing this or has experienced it themselves I would appreciate some advice on how to proceed/what to look for.



Thanks

[NoRalPh]

Maybe some insight here??

From the "Dieslemans Site under Tech Info"

Loss of power, usually after a hard acceleration; Rough idle; Check engine light comes on, DTC P1211:
Intermittent high pressure oil leakage.
This condition usually occurs when the vehicle is cold and the oil is thick. When performing a hard acceleration, the truck suddenly looses power, the check engine light comes on, and once returning to idle the engine runs rough and won't accelerate. Cycling the key may correct the concern, clearing the code from the PCM will correct it temporarily. If you can monitor data stream, at idle the ICP pressure normally is 400-700 PSI and the IPR duty cycle is 9-14%; at cruise, ICP is 700-1200 pSI and IPR is 15-20%; under normal acceleration, ICP is 1200-2000 PSI and IPR is 20-30%; and under WOT accel, the ICP is up to 3600 PSI and the IPR is 35% or higher. When the above symptom occurs, typically the idle ICP reading will be normal, but the IPR duty cycle will be high--over 20% and up to the max 50%. A "blow-by" condition has occurred somewhere in the HP oil circuit. If you can get the problem to re-occur with some frequency, the most probable cause is worn or deteriorated injector or IPR o-rings. If the problem is intermittent, it could be a sticking IPR valve. Replace the injector o-rings with the latest-level kits--F8TZ-9229-AA. When replacing the IPR, make sure you get the correct part for the build date/serial number of your engine.

[ajamesm]

[QUOTE=NoRalPh;3081070]Maybe some insight here??

From the "Dieslemans Site under Tech Info"

Loss of power, usually after a hard acceleration; Rough idle; Check engine light comes on, DTC P1211:
Intermittent high pressure oil leakage.
QUOTE]

The description of the problem is similar, but I am having no loss in power or rough idle and like I said the IPR is brand new so it is ruled out. Also, it does not matter what the temperature of the oil is, it will turn on the light anytime it is under hard acceleration or under a heavy load on the highway. The only way I know there is a problem is the light coming on, no other symtoms. Also, is it possible for such new orings on the injectors(last year) to have already deteriorated to the point of having this problem? I had read about this problem, but had ruled out orings since they are not that old. I thought it might be something else. Have you ever heard of getting air in the return fuel line?

Thanks again

[jesilvas]

You are running out of HPO. Plain and simple. That is what the ICP is telling you.
Which means either the ICP is correct or lying.