7.3 No start

silverpsd_06 · Jul 28, 2014

Have a 96 powerstroke that will not start, have replaced IDM with a known good one, new cps, new fuel pump also. Got it hooked to a solus today to monitor ICP and IPR duty cycle, ICP stays at a 170 psi for the first 6-7 seconds of cranking and then maxes out to 2464.7 and doesn't budge. IPR duty cycle starts at 15% then hits 55% and hangs there. Solenoid was loose on the IPR so I tightened the tin nut to see if that helps to no avail.

I'm leaning toward a bad IPR or a hpo leak of some sorts has anyone ran into this situation before? Any advice would be appreciated!

Arisley · Jul 28, 2014

Unplug the ICP. See what happens. If it starts, replace it.

silverpsd_06 · Jul 28, 2014

Unplugged already no change

Justin@DP-Tuner · Jul 28, 2014

Any smoke while cranking after it hits over 500psi ICP?

silverpsd_06 · Jul 28, 2014

Negative no smoke at all. Not even the slightest hint of wanting to fire. I was wondering if it defaulted to 2464.7 to try to lie the computer into firing?

silverpsd_06 · Jul 28, 2014

It's not a gradual climb to that number either it's instantaneous

97stoker350 · Jul 28, 2014

Sounds like my problem. I believe I have a bad ipr. Might try cleaning yours c if it fires mine did

silverpsd_06 · Jul 28, 2014

I have a running engine in the parts truck thirty feet away I'll just grab the IPR out of it and swap see what happens... Any other ideas possible o ring problem?

silverpsd_06 · Jul 29, 2014

Tried swapping out the IPR and no change, swapped IPR pigtail and no change still. Still only building 160-170psi on the scanner. Going to try to block off the hpo feed lines to the head and see if it will build any pressure on a manual gauge. This motor only has 46,000 miles on it I don't see a pump going bad with that low of miles, what else could it possibly be leaking in the motor besides injector o-rings or maybe one of the small allen plugs missing out of the oil rail?

Justin@DP-Tuner · Jul 29, 2014

Is it throwing any codes? May want to pull the valve covers and check everything out under there.

silverpsd_06 · Jul 29, 2014

The only code it is throwing is a p1212.. Pulled valve covers on the drivers side and no oil is coming from the injectors at all. Fuel bowl is clean every time so I don't think it is pushing back into the fuel. Guy said it hiccuped once on the way home and then idled for maybe ten minutes and it just died like you shut it off.

littleredstroker · Jul 29, 2014

if they have oil pressure, fuel pressure, and a signal to fire these trucks will run..

i would stick with the ICP sensor...
If its somehow reading 2500 psi i wonder if the ipr is dumping PSI trying to bring it back down. the instant jump to me says electrical.

littleredstroker · Jul 29, 2014

silverpsd_06 said:
The only code it is throwing is a p1212.. Pulled valve covers on the drivers side and no oil is coming from the injectors at all. Fuel bowl is clean every time so I don't think it is pushing back into the fuel. Guy said it hiccuped once on the way home and then idled for maybe ten minutes and it just died like you shut it off.

actually that right there is probably it. assuming you cranked while no oil was coming out, your not getting signal to fire the injectors. run a buzz test, IDM or cam sensor

silverpsd_06 · Jul 29, 2014

If it's only seeing 160psi the pcm wont command the injectors to fire hence no oil correct?

Justin@DP-Tuner · Jul 29, 2014

silverpsd_06 said:
If it's only seeing 160psi the pcm wont command the injectors to fire hence no oil correct?

The injectors will not fire until they see 500psi.

I asked because he said it was going to 2464psi. If it was indeed going that high, then they would be firing as long as they were commanded to.

I agree on running a buzz test.

silverpsd_06 · Jul 30, 2014

It passed the buzz test flawlessly, put a manual gauge on and watched actual it built up to 210 with a brand new IPR with both feed lines blocked off from the pump. I'm guessing that only leaves the pump to be suspect?