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General 6.7 Discussion (2017-2019) General 6.7 Discussion

Thread: Exhaust Brake Ambient Air Temperature Reply to Thread
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  Topic Review (Newest First)
12-14-2019 04:15 AM
Originally Posted by scha0786 View Post
whats up with auto then. It must sense brake pedal position and auto turn on and off.

Is the exhaust brake feature just close the VGT vanes or is there an actual exhaust flap that squeezes down? I could not find anything about it in the coffee book for the 6.7.
I always use auto (mainly because I'm lazy and most of our hauls are highway based). From the manual:

This feature increases engine braking at higher engine speeds to provide better grade descent control with less brake and transmission wear and tear.
Note: Use this when driving downhill and carrying heavy loads or trailering.

Benefits of engine braking are:
Lower brake temperature.
Reduced brake fade.
Longer brake life.
Improved driving and trailering control.

Press the button on the switch bank next to the audio unit to switch the system on or off.

There are two engine brake modes, manual and automatic.
Manual Engine Braking
Press the button to switch on manual engine braking.
Release the accelerator pedal to maximize engine braking.
Apply the brakes. The transmission downshifts to lower gears.
Note: The engine braking feature only functions when you release the accelerator.
Note: You can shift the transmission to lower gears with progressive range selection (PRS) or manual shifting independent of pressing the brakes.
Note: You can also use manual engine braking with cruise control to improve grade descent control.
Note: If your vehicle has Adaptive Cruise Control, the speed control system uses the selected engine brake mode, transmission gears, and brakes to maintain the set speed and distance to the vehicle being followed.

Automatic Engine Braking
Press the button twice to switch on automatic engine braking.
Release the accelerator or brake pedal. The system remembers your vehicle speed.
Note: This feature offers smoother, less aggressive engine braking during downhill descents. It may not apply braking if the vehicle speed is not increasing, although it will apply full engine braking force when needed to prevent acceleration. The system automatically activates the engine brake and, if necessary, downshifts the transmission to lower gears to not exceed your vehicle's set speed when the brake or accelerator were last released.
12-13-2019 03:23 PM
Alberta Advantage There’s been no confirmed answer from Ford. To complicate matters, my truck is deleted. I’ve talked to the tuning company and they said nothing has been done with regards to the exhaust brake. Ford is saying it’s the tuning. I disagree as it’s intermittent and only when extremely cold.
12-13-2019 02:13 PM
HeavyAssault I have yet to see the 2017+ Coffee table book.
12-13-2019 07:49 AM
Originally Posted by Alberta Advantage View Post
Does anyone know what the ambient air temperature is that disables the engagement/use of the engine brake feature?

Tried using it this morning and it was -21*C or about -6*F with windchill and it wouldn’t work. Let my truck sit in a heated shop for about 30 minutes and it worked no problem.
I experienced this a few weeks ago as well. It was around 15F and the oil was about 120F. The manual says not to engage it under slick conditions but I'm thinking it has more to do with EGT temps.
12-03-2019 06:57 AM
scha0786 whats up with auto then. It must sense brake pedal position and auto turn on and off.

Is the exhaust brake feature just close the VGT vanes or is there an actual exhaust flap that squeezes down? I could not find anything about it in the coffee book for the 6.7.
12-02-2019 05:45 PM
Alberta Advantage I put my exhaust brake onto “on.” I’ve never put it in “auto.”
12-02-2019 04:38 AM
scha0786 do you guys put the exhaust brake to on or auto? I typically flip it to on when i'm heading down grade otherwise I leave it off.
11-30-2019 10:27 AM
Alberta Advantage I just went to the dealership as they have a 2018 Platinum F350 in their used lot that’s speced the same as mine. Grabbed a salesman and the keys, fired it up, and the exhaust brake turned on, no hesitation, no problem. If a used truck in a crappy economy that’s sat on the lot for weeks/months and hasn’t been moved isn’t the best test subject, I don’t know what is.
11-29-2019 07:37 PM
7.3lf550 I totally forgot to check yesterday morning, however i did this morning.

Ambient temp was 29 degrees. EOT/ECT 30 degrees

Started truck, waited 2-3 seconds for dash to clear, and hit the button. It came right on. Waited 30 seconds or so, headed down the road, and it was definitely working.

Maybe 30 degrees isnt cold enough
11-28-2019 11:38 AM
Alberta Advantage Not a fluke/one off. Wouldn’t work this morning either. Local dealership has a call into Hotline to find out the exact temperature that it becomes disabled. Guess I’ll find out in a couple days as they’re closed for Thanksgiving.
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