Issues running while towing
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
Ok, I think I'm a little closer to figuring this out.
Hooked up to the trailer and drove it, got about 3 miles down the road and I heard the thumping, check the gauges and my ICP was steady at 1586 PSI, and my IPR was at 44.5%.
Those numbers stayed exactly the same until I shut the truck down and restarted it.
After I started driving I put one of the gauges on Exhaust back pressure, it stayed on 17.8 lbs no matter what I did, the ICP started showing 0 PSI even though the truck was running, and the IPR was at 23%.
Again, these numbers stayed exactly the same until the truck was shut off.
Are all of these sensors on the same computer? it sounds like either a wiring or computer problem.
Hooked up to the trailer and drove it, got about 3 miles down the road and I heard the thumping, check the gauges and my ICP was steady at 1586 PSI, and my IPR was at 44.5%.
Those numbers stayed exactly the same until I shut the truck down and restarted it.
After I started driving I put one of the gauges on Exhaust back pressure, it stayed on 17.8 lbs no matter what I did, the ICP started showing 0 PSI even though the truck was running, and the IPR was at 23%.
Again, these numbers stayed exactly the same until the truck was shut off.
Are all of these sensors on the same computer? it sounds like either a wiring or computer problem.
The ICP should fluctuate from about 650 at idle to 3500psi while under load (towing that trailer). But either way you should see it fluctuate on the gauge while idling.
The EBP sensor should read Barometric pressure on a cold engine with Key On Engine off. This goes for the MAP sensor as well. You can check these in the morning before starting the engine. Under load she should read in the 40's at 25 psi of boost.
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
Where are you located?
The MAP, Baro & EBP sensors will all read Barometric Pressure on a cold engine that sat overnight with the Key On Engine Off (KOEO). They should all read within .2-.3 psi of each other when reading them with an OBD type monitor. What are you using to read engine data? Torque Pro?
By verifying these sensors at KOEO you will know that they are functioning correctly before start up. Bad or clogged EBP sensors can mess with you fuel mileage, EGR Valve and turbo function.
The MAP, Baro & EBP sensors will all read Barometric Pressure on a cold engine that sat overnight with the Key On Engine Off (KOEO). They should all read within .2-.3 psi of each other when reading them with an OBD type monitor. What are you using to read engine data? Torque Pro?
By verifying these sensors at KOEO you will know that they are functioning correctly before start up. Bad or clogged EBP sensors can mess with you fuel mileage, EGR Valve and turbo function.
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Freshman User
Joined: Dec 2015
Posts: 49
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Where are you located?
The MAP, Baro & EBP sensors will all read Barometric Pressure on a cold engine that sat overnight with the Key On Engine Off (KOEO). They should all read within .2-.3 psi of each other when reading them with an OBD type monitor. What are you using to read engine data? Torque Pro?
By verifying these sensors at KOEO you will know that they are functioning correctly before start up. Bad or clogged EBP sensors can mess with you fuel mileage, EGR Valve and turbo function.
The MAP, Baro & EBP sensors will all read Barometric Pressure on a cold engine that sat overnight with the Key On Engine Off (KOEO). They should all read within .2-.3 psi of each other when reading them with an OBD type monitor. What are you using to read engine data? Torque Pro?
By verifying these sensors at KOEO you will know that they are functioning correctly before start up. Bad or clogged EBP sensors can mess with you fuel mileage, EGR Valve and turbo function.
South Mississippi, at sea level.
KOEO EBP is 14.8, MAP is 14.6
After rereading your post a couple of things seem odd.
The ICP should fluctuate from about 650 at idle to 3500psi while under load (towing that trailer). But either way you should see it fluctuate on the gauge while idling.
The EBP sensor should read Barometric pressure on a cold engine with Key On Engine off. This goes for the MAP sensor as well. You can check these in the morning before starting the engine. Under load she should read in the 40's at 25 psi of boost.
The ICP should fluctuate from about 650 at idle to 3500psi while under load (towing that trailer). But either way you should see it fluctuate on the gauge while idling.
The EBP sensor should read Barometric pressure on a cold engine with Key On Engine off. This goes for the MAP sensor as well. You can check these in the morning before starting the engine. Under load she should read in the 40's at 25 psi of boost.
I know that's not right.
And I don't think it was the scan gauge because my RPM and other gauges were still fluctuating as expected.
Went for a short drive with the trailer, monitored EBP, MAP, VLT and ICP.
MAP was dropping out under WOT, I got a video and I'll put it on youtube and link it here.
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Got the video up, here it is.
Ford 6.0 losing MAP at WOT - YouTube
Ford 6.0 losing MAP at WOT - YouTube
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Freshman User
Joined: Dec 2015
Posts: 49
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That's just a Scanguage issue. Their stock PID maxes out on range around 22-23psi. You have program a custom gauge, I think the tech folder up top has the info. Still need to do it on mine, but I don't normally run that value on the scan-gauge since I've got the factory gauge in the dash that actually reads pretty accurately.
Ok, thanks for the info.
Scratch a possible symptom so we are down to:
1. thumping from intake that fluctuates with RPM, only happens after a load, usually in tow/haul.
2. ICP, IPR, and EBP readings all freeze when "thumping" is present.
3. Loss of throttle for a few seconds, only happens while towing and when hot.
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Ran it some more in an abandoned subdivision, got everything very hot by doing short WOT runs and nothing, started driving it home (1/2 mile) and at a stop sign it started thumping, babied it home to keep the noise there (it has a habit of disappearing when revved up).
IPR, EBP, ICP and all gauges stayed active this time.
Took the video and then waited for the noise to disappear (I just sat and let it idle), and after a few minutes I bumped the throttle and the noise disappeared.
IPR, EBP, ICP and all gauges stayed active this time.
Took the video and then waited for the noise to disappear (I just sat and let it idle), and after a few minutes I bumped the throttle and the noise disappeared.
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Hotshot
Joined: Dec 2014
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From: Jersey Shore
If I was just listening to the truck running I would be thinking that there is a valve train issue due to that sound being tied to that issue.
With the freeze of electronic reporting and throttle at the same time as the noise I'm wondering if there is a harness issue that may be causing an injector to act erratically. It thumps like it's one cylinder, not all. It would be interesting to see injector balance when this occurs. Well, if IDS or AE would not be frozen as well.
With the freeze of electronic reporting and throttle at the same time as the noise I'm wondering if there is a harness issue that may be causing an injector to act erratically. It thumps like it's one cylinder, not all. It would be interesting to see injector balance when this occurs. Well, if IDS or AE would not be frozen as well.
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Freshman User
Joined: Dec 2015
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Dad has been out of town so he hasn't had any reason to fool with the truck, got back into town a few weeks ago and decided to do an oil change as it was coming due and he drained a little over 20 quarts from the system.
15 qts was oil and the rest was diesel, it appears that one of our injectors is leaking past the O-ring and contaminating the oil.
We have driven it a little bit just to run it and make sure it can run in case we get a hurricane and have to evacuate, so far we have not noticed any strange behaviors or noises, however the heaviest we have pulled was probably ~3500 lbs, less than 2 miles.
We're in the middle of escrow on a house with a shop so once we get moved we will be pulling the cab and diagnosing the contamination, replacing the oil cooler, and doing head studs.
I'm also gonna try to talk him into some type of digital gauge system and EGT probe to monitor everything.
We are currently planning on keeping the truck, we recently got a dump truck and will be picking up a tag along trailer to haul the equipment on so the truck will be pulling a lot less weight.
15 qts was oil and the rest was diesel, it appears that one of our injectors is leaking past the O-ring and contaminating the oil.
We have driven it a little bit just to run it and make sure it can run in case we get a hurricane and have to evacuate, so far we have not noticed any strange behaviors or noises, however the heaviest we have pulled was probably ~3500 lbs, less than 2 miles.
We're in the middle of escrow on a house with a shop so once we get moved we will be pulling the cab and diagnosing the contamination, replacing the oil cooler, and doing head studs.
I'm also gonna try to talk him into some type of digital gauge system and EGT probe to monitor everything.
We are currently planning on keeping the truck, we recently got a dump truck and will be picking up a tag along trailer to haul the equipment on so the truck will be pulling a lot less weight.
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