okay guys i have a 1996 f250 zf5 213xxx miles. the truck is just intercooled with super duty pipes and at the time of this occurrence i had a stock ts6 in it. i was drving the truck on the highway probably at about 60-70mph. 2000rpms or so. the check engine light kicked on and it was like truck blew the intercooler boot off. lost all power, no throttle response truck had no power and blowing more black smoke than usual. couldnt get it to go over past 2000rpms. so i turned the truck off, started it up. light went out and it drove fine rest of the way home. so i thought tuner was messing up, so i took it out, and doing the same thing. the light now kicks on randomly. not at an idle but it can be anywhere from a cruise to a hard pull its literally at random when it goes. i hooked it up to scan tool, got code P1211. i found ICP was reading voltage but no PSI. i put a new ICP in the truck, it is still doing the same thing. sometimes i can drive the truck 20 minutes with no issue or sometimes it may last 20 seconds before it throws a CEL. my next try is an IPR valve. i have already pulled the valve out and it looks like the orginal one from 96 haha. but o-rings looked okay, none were broken and the plug for the connector looked okay. but i have heard it could be anything. my IPR connector off the harness looked melted, so im getting a new one and putting a new IPR in. i checked the wiring out, it all looked okay. i have tested continuity from the main connector and those plugs & they all checked out okay. the truck sometime randomly does have a hard start out of no where, where it blows white smoke and takes a little longer to crank but it does start and sometimes gets a lopey idle almost as if air was in fuel. oil pressure gauge shoots up into its normal spot but i know these are just "dummy gauges" the truck has been totally fine and ran great until this. any help would be appreciated.

 

Is the tin nut tight on the IPR? When my 96C&C truck threw that code, the tin nut that holds the solenoid on tight.was missing. But it would die like you shut the switch off. I replaced it with a known good one and the problem went away. By the way welcome to the best forum going!

 

yes and to be totally honest with you the thing was rusted on there. i actually had to take a hammer and beat the washer off as it was literally stuck to the round part with the connector to the sensor. and thank you!

 

I think you are on the right track with the IPR, and the pigtail that runs it. Some have reported that replacing the pigtail fixed their problem. I would solder the wires together, not just use butt connectors.

 

i have a new IPR, got a new connector. im going to put it all in tonight and see how that goes. did some more research and have found out there can be shorts in the actual valve cover gasket harness. whoever did the pig tails to the valve covers before just butt connected them. they are poorly done. sooner or later down the road i will replace them. but i would think if it was in the harness it would throw injector codes for high/low side

 

Usually when a valve cover gasket/harness has an issue, the engine will drop a cylinder, or even shut 1 bank of cylinders off. You will get a ruff shaky idle, and low power. By my own experance, butt connectors are not the proper way to connect the valve cover pigtails. They might work for a while, but they will corrode and loose contact over time. And yes you should get an injector code if there is an issue there.

 

their definitely butt connected and they do look rough. no codes besides the P1211 ive been getting. and im not really having any other symtons of a rough idle besides a little lope every now and again. im going to try this IPR first than go from there. thank you for the info