Hey guys. I am a bit of a rookie with this stuff so bear with me. 94' F-350 7.3 DI has a no start condition. Died on me while going down highway. MIL lamp came on, followed by WIF light, followed by a stall while I was trying to find an approach.

Fuel bowl had a bunch of water in it. I drained it, cleaned it, and replaced the filter. Tested fuel pressure - regulator has adequate pressure. Tried to crank it over quite a bit, but it wouldn't start. Not even a hint of smoke while cranking, so it seems like the injectors aren't opening. Tach does move while cranking.

Hooked up my scan tool (OBDII, PCM has been reflashed), and got two codes - P1272 & 1274 - Cylinder 2 & 4 high to low fault (This shouldn't prevent all of the injectors from working, or would it?) . Buzz test seems normal, one long buzz followed by 8 short buzzes that sound identical.

I then tested ICP (kPa), ICPR (%) while cranking. 14%/54% ICPR before and during cranking, but 0 ICP (kPa). A friend told me to try with the ICP sensor unplugged, and the scan tool gives me 17000 kPa while cranking, but no start. I assume that this number is inaccurate.

The oil only has about 1000km on it, but I was pulling my trailer and it was running on the hot side for most of those 1000km. Even if the oil is broken down, should I still be getting some ICP, or could this be the issue?

Thoughts? Thanks in advance

 

Sounds like you have a failed ICP sensor but I believe it should still start with it unplugged just flatlines the pressure to 1500 but I could be wrong.

I believe there should be a resistance test for the sensor. I'm not sure of the values tho.

If the sensor test good a failed HPOP would be the next issue. Good time to go terminator pump from riffraff if that's the case. I would have a hard time believing that having some water in the fuel water sep. would kill the truck on the highway and after draining and filling no start

 

Contaminated fuel, try swapping tanks.
Also could be the IPR, IPR O rings or even failed injector O rings.

 

I would address your shorted injector codes first. If you can clear the codes and they come back, clearly something is wrong with the injectors, wiring to the injectors, or the IDM.

 

Awesome stuff, thanks guys. I am going to replace the sensor, then figure out the fault with those two injectors. I think it could possibly be somewhere in the harness under the valve cover, from what I have read they seem to go bad fairly often in these trucks. I will keep you posted.

Thanks again!

 

Good idea to get some SD valve cover gaskets. They have bigger connectors to handle the GP current.