7.3 Powerstroke '97 no start

[minkey]

Hi
New poster.
I have no start on my '97 powerstroke. HP oil level ok, oil changed.
Fuses ok.
I have attached a Scan tool I get no error codes stored in the PCM.
The scan tool communicates with the PCM.
I get no 'live' PID codes at all. The scan tool works on my wifes car so it is OK, PIDs show.
Cleaned the PCM connector.
Am I looking at a new PCM?
I have searched every forum for this problem, I cannot find anyone else with it!
Thanks

[jphelzer]

Might be the CPS? Pretty common problem with the 7.3s, although usually they'll die while running and then restart.

Does it crank?

Might also be fuel pressure, or the lack thereof. Smart people here have said it takes 50lbs to start the truck...

Good luck, and again welcome!

[minkey]

Hi, That was one swift reply! What about the PID codes (or lack thereof?) must be significant?
Thanks for the welcome!

[LTFOX]

Have you checked all fuses......under the hood also????

[minkey]

Hi
Sorry for the long delay with this post.

It turns out the 97 F350 powerstroke diesel is not OBDII complient.
I ended up getting an Autoenginuity kit so I could read the sensors.

During start RPM was 150
Power was 12(ish)
Inj. Cntrl Press. (ICP) was 0.5. (0.85 needed to start)

I made up a hydraulic gauge connected to the engine pressure, was low..
Which means ICP sensor appears OK

Either IPR valve, a leak or the HPOP pump
Removed the IPR strip down clean replace, pressure still low.
Check wiring to IPR, checks out, 12v OK,
Removed the IPR again put the finger of a rubber glove over it
Replaced, pressure 500 ish and engine start.
Clearly an IPR problem.

I can at least drive to get a new IPR.
Hope my experience helps someone else here.
Thanks for the suggestions and help guys

[worx]

That is a great quick fix to limp home! I had the IPR go out on the road- $600 and change it was replaced and I was going after missing a day of work... but I didn't have any ideas like that to try!

[coltjmc]

I have a 7.3 that i cannot start. I have replaced the glow plugs the cam position sensor and the glow plug relay. One day it ran great, next day no start.

[pipelayerjdh]

Originally Posted by coltjmc

I have a 7.3 that i cannot start. I have replaced the glow plugs the cam position sensor and the glow plug relay. One day it ran great, next day no start.

Have you checked the fuel pressure while cranking? Any smoke coming from the tail pipe? Also, check fuse #22 under the hood.

[coltjmc]

I have not checked the fuel pressure, but fuse 22 is good

[minkey]

Hi
you need 100rpm to start (comes from cps)
you need 500 psi from Hpop to start (comes from IPR and, measured by pressure sensor)
you need 10.5v from battery to start
You need fuel SYNC to start.
Some way of checking these is useful (a scan unit)
Then you will know where to start fault finding.
Good luck