Another 7.3 not starting...
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Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
Another 7.3 not starting...
My nephew has a 99 F350. He hasn't had any problems with it until Saturday. We were driving along when it died and won't start. He was going to put fuel in it as it showed 1/8 tank. We added 5 gallons and verified the fuel bowl was full.
First pulled his TS Chip, put another working PCM from my sons 2000. Pulled the CPS & IPR from my 99. Checked all fuses. Attached scanner, no codes, showed oil pressure only building to about 50 lbs. Injector buzz test checked OK. He is thinking it may be the HPOP. Before we go to that expense, does anyone have anything else to try?
First pulled his TS Chip, put another working PCM from my sons 2000. Pulled the CPS & IPR from my 99. Checked all fuses. Attached scanner, no codes, showed oil pressure only building to about 50 lbs. Injector buzz test checked OK. He is thinking it may be the HPOP. Before we go to that expense, does anyone have anything else to try?
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Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
Yes, everthing seems to be working normal. The tack is working while cranking. The oil pressure builds. Just no start.
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Senior User
Joined: Mar 2003
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From: Western Kentucky
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Hotshot
Joined: Feb 2007
Posts: 10,499
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From: Sterling Heights,Mi
I know you said everything was normal.. but please check again for the wait to start light..I know when it first happened to me, I did not notice the lack of the light the first time.
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Hotshot
Joined: Feb 2007
Posts: 10,499
Likes: 10
From: Sterling Heights,Mi
There is one other sensor ( I think ) that will do this to you.. IF you unplug it, you will be able to run, but not drive.. I want to say ICP?? Hopefully someone else will chime in with the right answer..
Hotshot
Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
You are correct- it's the critter on the front of the driver's side head, facing inward toward the HPOP/fuel bowl.
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Engine oil full? Make sure you didn't damage an o-ring and got the tin nut back on right when you swapped the IPR. Truck's not going to start if you're only seeing 50 psi of high pressure oil. Does IPR duty cycle go up to 65% while cranking? Unplugging the ICP sensor won't hurt and is worth a try.
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Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
We have verified the wait to start light.
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Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
We have run the batteries down, but have it on a heavy duty charger used for heavy equipment.