7.3L Died while Driving. Start-No Start

11562 Views 11 Replies 3 Participants Last post by Greg03PSD, Oct 10, 2015

Boarder22

Discussion Starter · Oct 5, 2015

Ok I have a 08/99 F-350 Super duty with 7.3L it died when driving down the road pulled over hit the key and It fired up got it home and went to start next day will not start only crank over. Things that have been checked are as follows

No Codes at all have shown up in the computer.
HPOP is good on oil in the Res.
Motor oil is full.
WTS light is coming on.
Good hot batteries.

ICP sensor- Replaced
Cam Sensor - Replaced
IPR - Replaced / Scan tool showing 15% / 12V going to plug verified/ Brass nut is tight.
Lift Pump - Checked / good working order
HPOP - Snap on scan tool Ethos showing up to 2,250 psi on InjCtrlPr(PSI) when cranking over in live Data for 12 sec.
IDM- Put in one off another truck that is good and did not change anything.
Checked fuses and relays.

Hopefully someone can shed some light on something I have over looked or could check?

Thank You

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roger.lees51

· #3 · Oct 6, 2015

Hi,
I have a similar problem I have been fighting for a number of years. My 2001 7.3L will occasionally stall when in traffic with no warning.
The bigger problem occurs when I have been on the road for 2-4 hours traveling with no stops. I get a very, very hard miss with black smoke out the tail pipe. It is very brief and I immediately back off the speed and it goes away. I have replaced both the ICP and CAM sensors. I never get a code. I'm at a loss. I'd take it to a shop but I just don't know how they could diagnose this when it only occurs on the road.
Thanks

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roger.lees51

· #6 · Oct 6, 2015

Greg,
Thanks a million for the info. I'll start on that tomorrow.
If I am ever in your neck of the woods I will certainly the bring beer!
Thanks again

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roger.lees51

· #9 · Oct 7, 2015 (Edited)

THANKS!

Greg03PSD said:
Problems like this could be related to the IPR. Make sure the tin nut is present at the back of the IPR - it is what holds the little solenoid in place. An IPR solenoid sometimes will become weak with age, and it is aggravated by high temperatures. If the problem only occurs when the engine is hot, your IPR may be on its last leg.

You would need some hardware and software to do this, but if you could monitor your ICP and datalog it while driving, it might reveal something. A sudden drop in ICP followed by a return to normal could indicate a failing IPR. A new IPR is about $200.

If you don't know what you are looking for, look down the backside of the HPOP toward the driver's side. Here is a picture of an IPR. The tin nut is the gold nut at far right end of the picture:
IPR Injection Pressure Regulator 96-03 7.3L Ford

You'll like it there.

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