truck fired right up this morning took off down the road, about a half mile hit the brakes to stop at a stop sign and it just died....Tried re-starting but it just turns over and won't fire...I changed the cam position sensor,wait to start light comes on, has oil pressure while cranking also tachometer moves while cranking,no check engine light, only code is kam code, there was oil in the ipc sensor plug,"probably not normal" has fuel pressure at filter..i'm lost..Please help!!!!!

could it be the icm or ecm?

this is the first deisel i've owned so any help would be greatly appreciated

 

Did you try starting with the ICP unplugged?

Usually if the PCM is fubared you will not get a Wait to Start light.

Is the oil full?

About the only things that will shut down the 7.3 would be oil related or CPS.

Also check out the 7.3 forum, you might get a little more traffic. www.ford-trucks.com/forums/forum31/

 

Sounds exactly like a Cam sensor problem. Buy 2 new ones. Install one and throw the other in the glovebox for next time. It's a single 10mm nut holding it on and its right next to the crank pulley.

 

ok,,,cam sensor was the first thing i changed and that didn't help
changed icp sensor today still no crank
A local ford deisel mechanic told me to spray silicone spray into the turbo while cranking and it should run even if the injectors were not working at all and still it did not fire...
gonna swap out the idm tomorrow and try again and if that doesn't work i'm gonna have to have it towed to my buddys shop where he has a scanner for this engine....
Totally baffled and not happy i've only had this truck for about two weeks

 

Is there an alarm or remote start?

 

Not that I know of. When I got the truck the previous owner had busted the ignition out and broke the housing in the process.. he had the ignition box unbolted and was starting the truck that way but a couple days after I got it I replaced the column along with the ignition key switch but that was about a week and a half ago and I had no issues till yesterday.. I did however unbolt the ignition box and unplugged the key switch harness earlier tonite just to check and it still would not fire...it is a lariat model but I didn't receive a clicker box for keyless entry/alarm when I bought the truck so I don't know if its equipped with anti-theft or not

 

And yes.. the oil is full on the dipstick and the hpop reservoir has oil about an inch from the top.. while cranking the oil pressure gauge rises to where it was when the truck was running.. tach moves ..wait to start light cycles like normal...has fuel pressure at the bowl...not getting any smoke from the exhaust ..
Something is just telling the engine not to run just wish I knew what it was...this truck is what make my money so to have it down for going on 3 days is killing my bank account.. not to mention there is not 1 "cheap" part on these engines

 

If it wouldn't start with spray lubricant(essentially acting as starting fluid) you may be looking at compression issues honestly. I have not used silicone, but I have used WD40 in the same manner and even if the injectors are not being commanded to fire, it really should run as long as you are spraying into the intake.

 

Yea its weird though that it was running great then it was like someone shut the key off

 

Do you have a way to view live data? If so it can help. Need to know IPR duty cycle% and what the ICP pressure is while cranking. Assuming good compression, the starting requirements are pretty basic for the 7.3.

~10.5 volts while cranking
Around 100RPM as seen by the PCM while cranking
500 psi of ICP pressure as seen by the PCM while cranking

When those are met, the PCM will then command the IDM to fire the injectors.

Are you using Ford or International CPS's? Parts stores have been known to cause issues.

All fuses good?

 

All parts bout have been from ford dealership...and yes all fuses are good...I'm gonna tow it to my friends shop in the morning he has the diagnostic computer for the powerstrokes

 

Note those things, that should definitely lead to a cause. If ICP rises then plateaus around 200psi or so, generally that is a stuck IPR, which I think is a decent possibility given your symptoms. Also view Fuel PW while cranking that will tell if the IDM is commanding the injectors to fire as well, should be around .6 ms on a stock parameter truck.

Good luck, sorry you have to have it towed and be down. BTW where are you located, if close I could come by and run diagnostics for you too. Or maybe someone close could do the same.

 

Hudson, florida

 

Hmm, little far for me, lol.

ICP is important it can tell a lot.

For example if ICP continues to climb way above 1500psi, it's usually something electrical. If is stays way low like under 100psi and duty cycle continues to rise, usually that's the injector poppets leaking oil, not allowing pressure to build, and the hung IPR with psi's around 200-300psi.

Hope you figure it out soon.

 

I know it's a lot farther off than what most people are going too.

But since you were in the area of messing with the column and ignition, sometimes with aftermarket alarms there is a valet switch, which would kill the truck like that and not let it start. Meant for the purpose of the truck not being able to be stolen. It's a little far fetched, but it happened to me before. Just try to look under the dash for a switch or button :-)