7.3 cut off while driving won’t start
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7.3 cut off while driving won’t start
1999 7.3 f250 4x4 manual transmission 150,000 miles 2 owner truck. I bought it from my uncle who bought it new.
Truck shut down while driving. Won’t start. I have read through tons of posts on this site and have tried lots of suggestions to no avail. In the last few days in this order: checked all fuses, checked oil level, replaced cam sensor, replaced IPR oil sensor, replaced fuel pump. I’m stumped...please help. New batteries. Cranks over fine but won’t start.
Truck shut down while driving. Won’t start. I have read through tons of posts on this site and have tried lots of suggestions to no avail. In the last few days in this order: checked all fuses, checked oil level, replaced cam sensor, replaced IPR oil sensor, replaced fuel pump. I’m stumped...please help. New batteries. Cranks over fine but won’t start.
Got Data?
Joined: Dec 2012
Posts: 4,248
Likes: 1,381
From: Lake Stevens, WA
Hi Fing30. Sounds like a nice truck - always great to know the owner and history of the rig.
What oil sensor did you replace? RDI doesn't sound right. I'm familiar with the Injection Control Pressure (ICP) sensor and the Injection Pressure Regulator (IPR) - was it one of those?
Can you read OBDII codes with a scanner? (your phone, Forscan Lite app, and a bluetooth OBDII dongle will do it)
What oil sensor did you replace? RDI doesn't sound right. I'm familiar with the Injection Control Pressure (ICP) sensor and the Injection Pressure Regulator (IPR) - was it one of those?
Can you read OBDII codes with a scanner? (your phone, Forscan Lite app, and a bluetooth OBDII dongle will do it)
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New User
Joined: Jun 2020
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full tank of fuel.
no smoke while cranking over.
no check engine lights.
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
Could be bad IDM, relay, wiring, fuel pump,,,,,,, or any number of things.
I know you said replaced fuel pump but is it running, are you getting fuel pressure in the bowl?
Next step is to get a way to read codes, pressures, voltages, etc. Forscan or torqure pro on your phone with an OBII adapter are the easiest ways. Nedd to see if building Hpop oil pressure, getting signal to injectors, and more
I know you said replaced fuel pump but is it running, are you getting fuel pressure in the bowl?
Next step is to get a way to read codes, pressures, voltages, etc. Forscan or torqure pro on your phone with an OBII adapter are the easiest ways. Nedd to see if building Hpop oil pressure, getting signal to injectors, and more
Tuned
Joined: Apr 2004
Posts: 428
Likes: 74
From: Aroostook County, Maine
Low probability possibility: could it be the inertia switch/fuel cutoff switch? I know it takes a pretty good jolt for the circuit to open, but on an older truck (mine is an e99 man trans) I assume random stuff like that can let go at any time for no obvious reason. I believe it is on passenger footwell side.
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Logistics Pro
Joined: May 2017
Posts: 4,667
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From: Muskogee, Ok
Wait to start light come on before cranking?
Unplug the fuel bowl heater and replace fuse #30 under the dash?
Unplug the fuel bowl heater and replace fuse #30 under the dash?
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Fleet Mechanic
Joined: Sep 2011
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From: Albuquerque
your getting alot of good info real fast! Take t slow and easy by the numbers
you replaced the ipr and the cps, are they motorcraft? Cheap knockoffs will cause issues!
If fuel and oil is good, ( fuel pump working ) unplug your icp, see if that helps, if it's full of oil you will need to replace it
Also check the drivers side wiring harness, could be shorting out on the valve cover
you replaced the ipr and the cps, are they motorcraft? Cheap knockoffs will cause issues!
If fuel and oil is good, ( fuel pump working ) unplug your icp, see if that helps, if it's full of oil you will need to replace it
Also check the drivers side wiring harness, could be shorting out on the valve cover
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Already unpluged bowl heater and checked fuses.
Lead Driver
Joined: Jul 2003
Posts: 7,404
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From: Wheatland, Mo
I am gonna go with Wes on this one.
I had the same thing happen to me a few years back on a 5 lane highway during rush hour. Just shut down like someone turned off the key. Unplugged the fuel bowl heater, replaced the fuse, and was back on the road in a couple of minutes... once I figured it out.
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New User
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I am gonna go with Wes on this one.
I had the same thing happen to me a few years back on a 5 lane highway during rush hour. Just shut down like someone turned off the key. Unplugged the fuel bowl heater, replaced the fuse, and was back on the road in a couple of minutes... once I figured it out.
I had the same thing happen to me a few years back on a 5 lane highway during rush hour. Just shut down like someone turned off the key. Unplugged the fuel bowl heater, replaced the fuse, and was back on the road in a couple of minutes... once I figured it out.
its NOT the fuel bowl shorting. I already unplugged it.
Lead Driver
Joined: Jul 2003
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From: Wheatland, Mo
Laughing Gas
Joined: Jan 2007
Posts: 870
Likes: 9
From: Carbondale, CO
Also, when you replaced the IPR with Ford, did you also replace the solenoid?
You could also drain the fuel bowl, the cycle key a couple times to see if bowl refills.
Start reading on Forscan.