NSS reset on Excursion
Laughing Gas
Joined: Jun 2017
Posts: 835
Likes: 125
From: CSRA, SC
If the engine turns over then it's almost certain the batteries and starter are good enough for the task. Earlier I suggested you use a Bluetooth obd2 dongle and the torque pro app to do some monitoring. You haven't said anything about it so I'm assuming you haven't still. Ever since then throwing parts at the truck hasn't made it start. There are issues this engine can have that render it useless but won't set a code. You need to monitor the engine to understand what it's doing or not doing.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
I've had engines crank and sound like they are cranking fast enough to start. But the battery voltage was too low and the computer hadn't powered up, so no fuel was injected and no start was going to happen.
Tuned
Joined: Jul 2019
Posts: 353
Likes: 167
From: Central VA
What is the battery voltage while the engine is cranking?
I've had engines crank and sound like they are cranking fast enough to start. But the battery voltage was too low and the computer hadn't powered up, so no fuel was injected and no start was going to happen.
I've had engines crank and sound like they are cranking fast enough to start. But the battery voltage was too low and the computer hadn't powered up, so no fuel was injected and no start was going to happen.
Tuned
Joined: Jul 2018
Posts: 263
Likes: 9
From: Near Chicago
I know you said you have rechecked the fuse area, but if it was me I would methodically recheck everything in the area you had disconnected in the column and under the dash while looking at the linkage.
Things can get nudged enough to unplug, or get forgotten, pretty easily while searching about under/in a dash.
If it worked before the looking around my guess would be in that area is where the problem is.
Things can get nudged enough to unplug, or get forgotten, pretty easily while searching about under/in a dash.
If it worked before the looking around my guess would be in that area is where the problem is.
Posting Guru
Joined: May 2013
Posts: 1,199
Likes: 2
From: Oklahoma
Having a 7.3 that won’t start means you need help from
the diesel guys in the 7.3 forum.
for you to figure this out, we need to get some data from your PCM to understand what it’s seeing.
we need to know what you HPOP pressure is when craning. I believe minimum to start is 800 psi. We need to see the voltage drop when cranking, you need a minimum of 11.5 for the injectors to fire.
you need data from the CAM sensor, you need 600 rpms to start. We also need to know the IPR duty cycle.
we have some great no-start threads in the 7.3 forum. This is an engine electrical issue. It can be fixed!
One quick thing to try... pull the plug on the pressure sensor on the front of the drivers side head, it will tell the PCM to use known stock settings.
the diesel guys in the 7.3 forum.
for you to figure this out, we need to get some data from your PCM to understand what it’s seeing.
we need to know what you HPOP pressure is when craning. I believe minimum to start is 800 psi. We need to see the voltage drop when cranking, you need a minimum of 11.5 for the injectors to fire.
you need data from the CAM sensor, you need 600 rpms to start. We also need to know the IPR duty cycle.
we have some great no-start threads in the 7.3 forum. This is an engine electrical issue. It can be fixed!
One quick thing to try... pull the plug on the pressure sensor on the front of the drivers side head, it will tell the PCM to use known stock settings.
Fleet Mechanic
Joined: Nov 2015
Posts: 1,840
Likes: 188
From: NoVA
Having a 7.3 that won’t start means you need help from
the diesel guys in the 7.3 forum.
for you to figure this out, we need to get some data from your PCM to understand what it’s seeing.
we need to know what you HPOP pressure is when craning. I believe minimum to start is 800 psi. We need to see the voltage drop when cranking, you need a minimum of 11.5 for the injectors to fire.
you need data from the CAM sensor, you need 600 rpms to start. We also need to know the IPR duty cycle.
we have some great no-start threads in the 7.3 forum. This is an engine electrical issue. It can be fixed!
One quick thing to try... pull the plug on the pressure sensor on the front of the drivers side head, it will tell the PCM to use known stock settings.
the diesel guys in the 7.3 forum.
for you to figure this out, we need to get some data from your PCM to understand what it’s seeing.
we need to know what you HPOP pressure is when craning. I believe minimum to start is 800 psi. We need to see the voltage drop when cranking, you need a minimum of 11.5 for the injectors to fire.
you need data from the CAM sensor, you need 600 rpms to start. We also need to know the IPR duty cycle.
we have some great no-start threads in the 7.3 forum. This is an engine electrical issue. It can be fixed!
One quick thing to try... pull the plug on the pressure sensor on the front of the drivers side head, it will tell the PCM to use known stock settings.
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Senior User
Joined: Sep 2014
Posts: 108
Likes: 0
Problem Solved
The issue was a loose connection between the pcim and a tuner that the previous owner had installed. When I lowered the steering column I must have inadvertently caused it to become slightly unplugged. Thank you all for the input and help. If anyone else has a similar issue please feel free to contact me.
Laughing Gas
Joined: Jun 2017
Posts: 835
Likes: 125
From: CSRA, SC
The issue was a loose connection between the pcim and a tuner that the previous owner had installed. When I lowered the steering column I must have inadvertently caused it to become slightly unplugged. Thank you all for the input and help. If anyone else has a similar issue please feel free to contact me.
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