Heat causing problems - Diesel Forum - TheDieselStop.com
6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

 
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post #1 of 6 (permalink) Old 05-23-2019, 05:10 PM Thread Starter
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Heat causing problems

Hi everyone. New to this forum and looking for help. (04 F350 6.0 and already bullet proofed) Problem was 1st noticed about a year ago. Bought a nice heavy RV. Had a 300 mile trip home. On a few hills the engine gasped a few times like it was starved for fuel or air. Ended up cleaning the air filter and never had any more problems. Recently moved 2k miles and towed that RV. Several times under load pulling hills it started again. By accident I discovered that pulling over and letting the engine cool for 1/2 hr or so seemed to fix the problem temporarily. Made it to my destination in TX. Now I noticed that the problem seems to happen in stop and go traffic when a lot of heat is built up under the hood. It was suggested that I change the fuel filters, which I did and that seemed to work. Now a week later with temps around 90, its worse and it seems like the tranny is overheating. The dash gage actually drop in temp and the tranny slips hard. I can just gimp it and it will slowly pick up speed. But, again if I pull over and let it cool down for 1/2 hr it seems to run better until it heats up again. Sorry for the long post, but I thought the more info the better. Thanks for any help
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post #2 of 6 (permalink) Old 05-24-2019, 03:16 PM
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Glad you made it to your destination. I don't have a ton of experience with those symptoms. Have you ever tried to restart it right after hot shut down to see if it struggles to restart/build ICP?
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post #3 of 6 (permalink) Old 05-25-2019, 12:12 AM Thread Starter
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Yes. During my 2k mile trip, I shut it down thinking that it was a fuel or o2 problem. It would restart with no problems, but when I tried to move it, if it was still hot, it would make noise like it was gasping for air or fuel. But while trying to find mobile mechanics on the shoulder,I discovered that when it cooled down, the problem would go away until I started pulling a long grade. Then, again, it would get hot and start running and missing again. Like I said though, I finally figured that its something in the tranny when it gets hot, it starts slipping and grabbing causing the rough engine sound.
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post #4 of 6 (permalink) Old 05-25-2019, 06:41 AM
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Don't know much about Tranny's. Hopefully someone else will come along who can help.
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post #5 of 6 (permalink) Old 05-25-2019, 08:07 AM
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Perhaps the Problem Child needs to have an experienced technician look at it.


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post #6 of 6 (permalink) Old 05-25-2019, 06:39 PM
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If you want to track a few things down on your own (before taking it in), you might consider investing in a few things.

The PCM can "de-rate" power if one (or more) of several things happens. High coolant temperatures is one of them. This may or may not be happening to you. There are multiple other things as well. Oil temps might be telling as well!

It would also be good to see what your desired injection control pressure (high pressure oil) is running as compared to the actual ICP (psig), along w/ the IPR %duty cycle. Your FICM could also be acting up, so FICM voltages is helpful information as well.

Without data, you will get only guesses.

For $5 you can download a smartphone app (I recommend ForScan Lite) and then for another $35 or so you can buy an OBDII adapter (WiFi or Bluetooth depending on your phone) and you can read engine parameters and scan for codes. ForScan is a very thorough code reader. It is one of only a few that read most (if not all) of the transmission codes.

Codes and engine data "might" help you, or you could have a more significant issue.

A fuel pressure gauge is also a very good thing to have. Your injectors need 45 psig of fuel pressure at all times. Low fuel pressure is the top cause of failed injectors (which can be very expensive). Problem is that you need a sensor and a gauge to monitor the fuel pressure .... Ford did not ever install a fuel pressure sensor. Obviously a dealership could determine if you have proper fuel pressure.

Just a few things to think about.

Mark
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Last edited by bismic; 05-26-2019 at 06:52 AM.
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  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 6.0L Power Stroke Engine and Drivetrain

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