Warm Start Problem
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New User
Joined: May 2013
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Warm Start Problem
I have a 2004 Excursion with strange symptoms. It will start cold and when you drive it for a while, then turn it off, it will start again right away. If you leave it for an hour you will get a "crank no start". Leave it till the engine cools down completely and it will start again.
The other day it wouldn't start cold, but after I had it towed in to a mechanic, he turned the key and it started right away. I left it with him for 3 days and he could not get it to "not start". So I picked it up and drove it for an hour, parked it and left it for an hour came back and had a "crank no start" till it was cold again. I love my truck but it doesn't seem to like me.
Any ideas? Thanks in advance
The other day it wouldn't start cold, but after I had it towed in to a mechanic, he turned the key and it started right away. I left it with him for 3 days and he could not get it to "not start". So I picked it up and drove it for an hour, parked it and left it for an hour came back and had a "crank no start" till it was cold again. I love my truck but it doesn't seem to like me.
Any ideas? Thanks in advance
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Symptoms of a HPO internal leak. Hot oil is thinner and the HPOP can't build enough pressure. It needs 500+ psi to start.
Probably standpipe, dummy plugs or the STC fitting if yours iis the late build 04'
Try these things:
Disconnect the ICP sensor and try starting. If that fixes it, replace the sensor or pigtail if it has oil in the plug.
Remove the IPR valve and makes ure the screen isn't plugged.
If it still fails to run, you need an air test. Read the tech folder or you tube " diesel tech Ron" and watch a video how it's done.
You will need a monitor devise like Torque or Scan Gauge 2 to see the pressures in real time. You could ask a friend to borrow a gauge or another member to help if someone is close to you.
Probably standpipe, dummy plugs or the STC fitting if yours iis the late build 04'
Try these things:
Disconnect the ICP sensor and try starting. If that fixes it, replace the sensor or pigtail if it has oil in the plug.
Remove the IPR valve and makes ure the screen isn't plugged.
If it still fails to run, you need an air test. Read the tech folder or you tube " diesel tech Ron" and watch a video how it's done.
You will need a monitor devise like Torque or Scan Gauge 2 to see the pressures in real time. You could ask a friend to borrow a gauge or another member to help if someone is close to you.
Mountain Pass
Joined: Jun 2011
Posts: 166
Likes: 1
From: Las Vegas, Nv
Is it an early 04 or late? Late has a ICP sensor on passenger side valve cover. I just finally fixed mine. Had same problem. Turned out to be injector 4 high pressure inlet seal was shot. Replaced all seals on injector no problems now.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Try parking truck on a hill or curb, nose down under the conditions you expect it to be a no start. See if it acts any differently. Warm oil can drain from the HPO resivoir through leaking HPO seals back into the pan and be thin enough to give it a problem refilling. Cold oil pumps better so less problem fully cold. It could be many (other) things but this is an easy check.
Laughing Gas
Joined: Nov 2014
Posts: 765
Likes: 5
From: Long Island, NY
Try parking truck on a hill or curb, nose down under the conditions you expect it to be a no start. See if it acts any differently. Warm oil can drain from the HPO resivoir through leaking HPO seals back into the pan and be thin enough to give it a problem refilling. Cold oil pumps better so less problem fully cold. It could be many (other) things but this is an easy check.
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New User
Joined: Dec 2010
Posts: 8
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From: Kensington, MD
WatsonR: I'm having the same problem with an 06 super duty 6.0 L diesel. The truck starts fine when cold but when turned off at operating temperature will not start again until engine cools for several hours. Your post gave me some ideas but I can't determine what ICP and IPR stands for. I looked in my Haynes and can't find what these are. I believe HPO stands for high pressure oil. Would you mind writing back and explain what those acronyms are? Greatly appreciated.
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Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Injection control pressure = ICP
ICP is measured in volts and PSI, require better than 500 psi or 0.85 volts per cheezit to start. High pressure oil fires the HEUI fuel injectors.
Injection pressure regulator = IPR
This is what ramps up the pressure in the oil rails to the injectors based on load on the motor. Cheezit can explain better.
ICP is measured in volts and PSI, require better than 500 psi or 0.85 volts per cheezit to start. High pressure oil fires the HEUI fuel injectors.
Injection pressure regulator = IPR
This is what ramps up the pressure in the oil rails to the injectors based on load on the motor. Cheezit can explain better.
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New User
Joined: Dec 2010
Posts: 8
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From: Kensington, MD
Won't start when engine is hot
Mhoefer: thanks so much for the clarification. This problem appears to be beyond my abilities to repair. Waiting for the service dept. to reopen so I can get it in. Unfortunately, this also sounds like a very expensive repair, but at least I have some insight now as to what will probably have to be done.
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