Diesel Excursion cut off while driving
Thread Starter
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Junior User
Joined: Feb 2015
Posts: 61
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Diesel Excursion cut off while driving
2004 6.0 Excursion
199k Miles
SCT x4 Tuner with tow tune on it
Drove the truck for an hour today no issues until
was driving at low speed around 20 mph when the SCT tuner all of a sudden screen went from the gauge screen to show the turn engine on screen.
About 300 ft later while making a turn in the intersection, the truck cuts off in the middle of the turn. Electronics on the car were still working such as lights and radio however no power steering, brakes etc. I put the truck back into park and cranked it immediately back up no issues. No CEL. NO stored codes according to the SCT. Following the incident I drove it another 1.5 hours to drop it off at the mechanic. No issues.
This did happen one other time while driving at low speeds, it cut off as it did this time.
Where should I start? I have seen some other threads regarding this type of issue in the 7.3s and on other super duty trucks.
CPS Module?
IPR?
The two times it happened was low speed. Not sure if it was coincidence or if it does not happen at high speeds.
199k Miles
SCT x4 Tuner with tow tune on it
Drove the truck for an hour today no issues until
was driving at low speed around 20 mph when the SCT tuner all of a sudden screen went from the gauge screen to show the turn engine on screen.
About 300 ft later while making a turn in the intersection, the truck cuts off in the middle of the turn. Electronics on the car were still working such as lights and radio however no power steering, brakes etc. I put the truck back into park and cranked it immediately back up no issues. No CEL. NO stored codes according to the SCT. Following the incident I drove it another 1.5 hours to drop it off at the mechanic. No issues.
This did happen one other time while driving at low speeds, it cut off as it did this time.
Where should I start? I have seen some other threads regarding this type of issue in the 7.3s and on other super duty trucks.
CPS Module?
IPR?
The two times it happened was low speed. Not sure if it was coincidence or if it does not happen at high speeds.
Cross-Country
Joined: Jul 2003
Posts: 95
Likes: 2
I had similar issues for months, same year, same engine. My problems seemed to happen after hard stops, turns or acceleration.
After throwing parts at it for years (one bank of injectors and numerous other things I can't remember) and multiple times stranded with no restart, one mechanic finally figured it out.
The engine was acting like a fuel delivery problem because it was.
The inverted funnel/strainer looking thing at the bottom of the fuel pickup tube is plastic. It had disintegrated and was allowing pieces of plastic to be pumped into the fuel lines causing intermittent clogs. I think any abrupt handling stirred up junk which was picked up and pumped downstream.
They replaced the fuel pickup assembly, flushed the tank and lines and it's been fine since.
After throwing parts at it for years (one bank of injectors and numerous other things I can't remember) and multiple times stranded with no restart, one mechanic finally figured it out.
The engine was acting like a fuel delivery problem because it was.
The inverted funnel/strainer looking thing at the bottom of the fuel pickup tube is plastic. It had disintegrated and was allowing pieces of plastic to be pumped into the fuel lines causing intermittent clogs. I think any abrupt handling stirred up junk which was picked up and pumped downstream.
They replaced the fuel pickup assembly, flushed the tank and lines and it's been fine since.
Thread Starter
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Junior User
Joined: Feb 2015
Posts: 61
Likes: 0
I had similar issues for months, same year, same engine. My problems seemed to happen after hard stops, turns or acceleration.
After throwing parts at it for years (one bank of injectors and numerous other things I can't remember) and multiple times stranded with no restart, one mechanic finally figured it out.
The engine was acting like a fuel delivery problem because it was.
The inverted funnel/strainer looking thing at the bottom of the fuel pickup tube is plastic. It had disintegrated and was allowing pieces of plastic to be pumped into the fuel lines causing intermittent clogs. I think any abrupt handling stirred up junk which was picked up and pumped downstream.
They replaced the fuel pickup assembly, flushed the tank and lines and it's been fine since.
After throwing parts at it for years (one bank of injectors and numerous other things I can't remember) and multiple times stranded with no restart, one mechanic finally figured it out.
The engine was acting like a fuel delivery problem because it was.
The inverted funnel/strainer looking thing at the bottom of the fuel pickup tube is plastic. It had disintegrated and was allowing pieces of plastic to be pumped into the fuel lines causing intermittent clogs. I think any abrupt handling stirred up junk which was picked up and pumped downstream.
They replaced the fuel pickup assembly, flushed the tank and lines and it's been fine since.
Thread Starter
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Junior User
Joined: Feb 2015
Posts: 61
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It does have a rough idle sometimes. Maybe 1-20 stops at a stop light it will give a rough idle but once you accelerate no issues again.
Cargo Master
Joined: Nov 2017
Posts: 3,096
Likes: 533
From: Rock Hill, SC
The fuel sending unit pre strainer does degrade and break off, leaving your low to empty fuel level at a higher level. But momentary loss of fuel to the engine shouldn't cause your tuner to reset to it's start screen. That would probably occur if there was an interruption of power to the tuner. I'd say check your tuner connections for sure.
Cross-Country
Joined: May 2017
Posts: 90
Likes: 3
My original stalling issue was caused by the ipr pigtail it was causing a rough idle and stall. After I fixed that it was solved but the stall came back created by a different cause. To know for sure you’ll have to hook up the computer and monitor the oil pressure during the stall. It’s a pain but the only way to know for sure.
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Thread Starter
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Junior User
Joined: Feb 2015
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The fuel sending unit pre strainer does degrade and break off, leaving your low to empty fuel level at a higher level. But momentary loss of fuel to the engine shouldn't cause your tuner to reset to it's start screen. That would probably occur if there was an interruption of power to the tuner. I'd say check your tuner connections for sure.
The tuner connection is good as I fired it right back up when it cut off in the intersection and everything worked as planned. I will also say the tuner on the restart was reading mostly 0s until I unplugged it from the back of the tunerside to restart it.
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Thread Starter
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Junior User
Joined: Feb 2015
Posts: 61
Likes: 0
My original stalling issue was caused by the ipr pigtail it was causing a rough idle and stall. After I fixed that it was solved but the stall came back created by a different cause. To know for sure you’ll have to hook up the computer and monitor the oil pressure during the stall. It’s a pain but the only way to know for sure.
Lead Driver
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
Stop guessing or you will just jump from on thing to the next until your wallet is empty.
1. Remove any tune, tuner, programmer or other device that alters the stock PCM function.
2. Get Forscan or the equivalent and monitor the vehicle until you pinpoint the cause.
3. Install a fuel pressure gauge.
once you can pinpoint the cause you can then fix it.
Untill it stalls with the tuner removed I would assume it is being caused by the tuner.
1. Remove any tune, tuner, programmer or other device that alters the stock PCM function.
2. Get Forscan or the equivalent and monitor the vehicle until you pinpoint the cause.
3. Install a fuel pressure gauge.
once you can pinpoint the cause you can then fix it.
Untill it stalls with the tuner removed I would assume it is being caused by the tuner.
Laughing Gas
Joined: Jul 2018
Posts: 816
Likes: 7
From: Prescott, AZ
Stop guessing or you will just jump from on thing to the next until your wallet is empty.
1. Remove any tune, tuner, programmer or other device that alters the stock PCM function.
2. Get Forscan or the equivalent and monitor the vehicle until you pinpoint the cause.
3. Install a fuel pressure gauge.
once you can pinpoint the cause you can then fix it.
Untill it stalls with the tuner removed I would assume it is being caused by the tuner.
1. Remove any tune, tuner, programmer or other device that alters the stock PCM function.
2. Get Forscan or the equivalent and monitor the vehicle until you pinpoint the cause.
3. Install a fuel pressure gauge.
once you can pinpoint the cause you can then fix it.
Untill it stalls with the tuner removed I would assume it is being caused by the tuner.
These simple steps should be burned into the header and footer of the 7.3l forum's pages. To them, I would add a couple elementary diagnostic ground rules as well: check engine oil level and quality, ensure minimum fuel level, battery and ground connections clean and secure, batteries at acceptable voltage and charging system properly functioning. Troubleshooting a computer controlled engine with a sketchy voltage/battery/charging system is the definition of frustration, and adding a tuner throws in a world of variables not covered in the shop manual.
I've seen people throw literally thousands of dollars at a problem that would have been reconciled with the above-mentioned tools, procedures, some patience, and access to the shop manual. Worse, I've seen shops charge people thousands of dollars without having done many of these steps... and never fix the problem.
Thread Starter
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Junior User
Joined: Feb 2015
Posts: 61
Likes: 0
Stop guessing or you will just jump from on thing to the next until your wallet is empty.
1. Remove any tune, tuner, programmer or other device that alters the stock PCM function.
2. Get Forscan or the equivalent and monitor the vehicle until you pinpoint the cause.
3. Install a fuel pressure gauge.
once you can pinpoint the cause you can then fix it.
Untill it stalls with the tuner removed I would assume it is being caused by the tuner.
1. Remove any tune, tuner, programmer or other device that alters the stock PCM function.
2. Get Forscan or the equivalent and monitor the vehicle until you pinpoint the cause.
3. Install a fuel pressure gauge.
once you can pinpoint the cause you can then fix it.
Untill it stalls with the tuner removed I would assume it is being caused by the tuner.
I have 3 other excursions and the same tuner and have had no issues with any of the others ones.
Laughing Gas
Joined: Jul 2018
Posts: 816
Likes: 7
From: Prescott, AZ
The fact that you noted an anomoly in the operation of the tuner, followed shortly thereafter by a stall, does indicate a relationship - whether it is cause or effect is yet to be determined. The tuner itself may be perfectly fine, with a simple connection at fault.
As with all intermittent issues, it will likely be a frustrating journey to find the cause. Keep us updated, resolutions add to the collective knowledge base.
As with all intermittent issues, it will likely be a frustrating journey to find the cause. Keep us updated, resolutions add to the collective knowledge base.
Postmaster
Joined: Sep 2016
Posts: 3,941
Likes: 240
From: Texas
Fuel pressure gauge should be standard equipment on a 6.0. I have a 2003 and when I dropped tye tank last week to rebuild the sending unit the screen and funnel on the bottom of the pickup were laying in the tank broken in pieces. I dropped the tank by myself, not hard to do at all.