Running with ipr unplugged
 

I have a 96 ford 7.3 and recently put rebuilt injectors, new ipr,icp sensor,pcm and a few other parts on it. The truck starts right up but blows alot of white smoke and after a few minutes the check engine light comes on and starts running really rough. Had it hooked up to a computer and found that the fuel pressure goes to maximum within a few minutes of running and that's what I'd throwing the engine light on. We unplugged the ipr and it starts right up so the guy said it is the high pressure oil pump......any thoughts on this assumption?? If it matters the oil pressure sensor is buried on low till you give it some throttle then it goes to normal so it could use a lpop.

how many miles do you have on it since you put the injectors in? need to get a scanner on it to see what kind of pressure the HPOP is putting out to see what kind of shape it is in.

About 20 miles on the injectors and I had a scanner on it the fuel pressure is around 350 then after a min or two it spikes to 3500

that is not fuel pressure, that is ICP. fuel pressure can not be read with a scanner and should only be about 65psi. you need to have about 100 miles on the injectors before they get all the air out and start running and starting smooth.

I'm not so sure about that because it was a $9,000 computer he plugged in and I seen it with my eyes that the fuel pressure went to 300 psi that's why he was thinking bad hpop because we unplugged the ipr and the truck still runs so he was thinking something internally must be bypassing the ipr

3000psi I mean

could be a $1,000,000 scanner, it wont tell you fuel pressure. he was looking at ICP.

So if it was icp then does that mean the assumptions of the hpop issues would be wrong?

i would guess its a sensor issue, a bad hpop would not cause it to spike in pressure i wouldn't think. i would guess its a ICP or IPR issue

Icp is new and ipr is new. That's why he is assuming hpop because he said it should go into default with the ipr unplugged