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09-01-2015, 01:06 PM
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#1
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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weird tow/haul glitch?
On the drive today, I was using tow/haul like I always do, and rpms went to almost 3000 and stayed there even after the downgrade leveled out. Turned it off and rpms went bit higher, then dropped down to the normal 1700. Did not re-engage tow/haul again. Will try again when I tow again in three days. Anyone seen this on their ford? John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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09-01-2015, 01:30 PM
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#2
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,550
M.O.C. #2283
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Never seem that. I have never seen 3000 RPS after I got up to speed. Was your transmission slipping or was it in a lower gear?
Lynwood
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09-01-2015, 02:07 PM
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#3
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Montana Master
Join Date: Jun 2010
Location: Colorado Springs
Posts: 3,335
M.O.C. #10496
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Could even be a on board computer malfunction. Check it with a reader that can display error codes. Keep us posted as to what you find.
__________________
2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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09-01-2015, 02:29 PM
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#4
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Have not seen on any of our ford diesels
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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09-01-2015, 03:04 PM
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#5
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,167
M.O.C. #6433
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I have seen over 3,000 going down a steep grade and the tow/haul engine braking on and transmission downshifting a number of times. Once the grade levels out and I touch the throttle it shifts back to a higher gear and the rpms fall back to normal. Since it does it consistently on steep downgrades I assume that is normal.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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09-01-2015, 04:17 PM
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#6
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Montana Master
Join Date: Oct 2007
Location: silver creek
Posts: 1,507
M.O.C. #7770
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we have a gas version with that. On one of our down hill runs it does the same thing. It seems that braking at the same time screws something up in the program. It stayed around 3000 rpm at bottom of hill,seemed to hang there and then finally dumped out. But as i said, it was fine till I started braking slightly at the same time,I don't know if you were braking, with your diesel you should not have to on most occasions,but I am not sure
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09-01-2015, 06:49 PM
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#7
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Montana Master
Join Date: Nov 2012
Location: Rancho Santa Margarita
Posts: 633
M.O.C. #13025
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My Chevy has seen 3000 on steep downgrades and sometimes after accelerating it still takes time to upshift and reduce RPM.
__________________
Russ and Linda, So. California
2004 Chevy Silverado 2500 HD, D/A, SRW, SB
2005 2955RL, Pullrite Superglide 16K hitch. Bridgestone Duravis R500 tires. EZ Flex Equilizers with wet bolts.EMS HW50C, Disk brakes
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09-01-2015, 07:45 PM
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#8
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Montana Master
Join Date: Mar 2012
Location: Redding
Posts: 1,421
M.O.C. #12339
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Did you run a Health report? It should indicate the malfunction!
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09-02-2015, 04:13 AM
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#9
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Montana Master
Join Date: Jun 2010
Location: Colorado Springs
Posts: 3,335
M.O.C. #10496
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How do you run a "Health Report"?
Quote:
quote:Originally posted by Artemus Gordon
Did you run a Health report? It should indicate the malfunction!
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__________________
2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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09-02-2015, 05:04 AM
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#10
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Montana Fan
Join Date: Apr 2011
Location: Baton Rouge
Posts: 431
M.O.C. #11342
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Did RPMs remain at 3000 even as you accelerated?
I think that the tow haul program will stay in the downshift/low gear/braking mode until signaled to upshift by acceleration.
Newer trucks with hill decent feature (when turned on) will start to downshift and decelerate when speed increases while descending a grade.
Tow/haul program downshifts and upshifts at higher RPMs when turned on, but downshifting starts when slowing (brakes applied momentarily) and upshifts later (higher rpm) when accelerating.
The program does not know what the driver wants. Acceleration causes upshifts.
Slowing causes downshifts. when descending a grade, some braking is required to start the downshift.
I may have this all wrong, but it is my recollection of a description given at a Super Duty owners workshop at my local dealer.
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09-02-2015, 08:38 AM
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#11
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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I was also running in cruise control at the time and truck did accelerate at next slight incline. Things overwise normal. I am used to it downshifting to attempt to hold speed during descent, then seeing return to 1700 rpm with upshift. Didn't see anthing on info center for health report on this 2012 f350. I am assuming it to be a glitch until it does it again. Maybe ford dealer can see a code when I get oil changed after towing to williams, az. No signs of slipping or any kind of issue prior to this. Thought I also pressed accel more at bottom of descent. Old brain...who knows. Did move info center to show tranny and oil temps after this and highest oil temp in tow was 239, tranny highest was 210...level towing was mostly 210/196 for oil/tranny. John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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