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Old 07-18-2016, 02:43 PM   #1
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Cruise Control Disengages on Ford E450 Chassis

Just got back in Tempe,AZ from a trip through the Rocky Mountains and the Black Hills in my 2014 Concord built on the Econoline 450 chassis. I am towing a 2015 Equinox and when going up a long grade with cruise control engaged when the RPM's are in the 4000's after a few moments the cruise control disengages by itself. After the first couple of times I kept my foot on the accelerator and maintained the rpm manually. Have others experienced the same problem?
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Old 07-18-2016, 03:09 PM   #2
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Seems typical of Ford. If the MH drops below a certain speed, the cruise kicks out.

It is probably due to it not being able to downshift the next gear and still maintain the set speed.

On mine, I watch the speed and when it gets near 45 mph, I put my foot near the gas pedal.
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Old 07-18-2016, 03:56 PM   #3
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I have an older E350 and it kicks out if the speed drops by 10km/h. Might be the same in the newer models (don't know why it can't just downshift though).

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Old 07-18-2016, 08:15 PM   #4
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That's a safety feature mentioned in my owners manual on a 2006 . The Ford F series trucks do this as well.
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Old 07-19-2016, 04:51 AM   #5
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My F53 chassis does the same thing. If the cruise is holding the pedal on the floor (long uphill) it will disengage after 30-45 seconds.

It gets your attention first couple times it does this.

I now have a good idea if its going to do it, so I put my foot on the pedal just in case.
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Old 07-19-2016, 05:55 AM   #6
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From page 143 of the 2014 E-Series Owner's manual:

"Note: Cruise control will disengage if your vehicle speed decreases more than 10 mph (16 km/h) below your set speed while driving uphill."
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Old 07-19-2016, 06:06 AM   #7
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It seems rational to slow down if the hill is that long and steep. I'd be downshifting thus losing speed to let the engine run with less load. The cruise control will not be happy about that but the engine and I would not care. ;-)
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Old 07-19-2016, 08:28 AM   #8
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Very interesting - I have a new 2016 - How does the cruise work going down a steep grade....what should I do to prepare for the mountains out West?
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Old 07-19-2016, 11:20 AM   #9
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First off, the dealer that sold me the MH did not include the Ford Cutoff manual.
Secondly, the cruise worked well on the less steep grades but as I had a toad, on the really steep and long downhills I manually downshifted to third gear because i wanted to control the load and save the brakes. Just that one anomaly caught my attention. The west has many beautiful mountains that might make you ask yourself what did I get into but after you climb and decend big hills it's no that bad. Don't think I'd try it in the winter however. Enjoy your trip and don't let the mountains get you too excited.
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Old 07-19-2016, 11:23 AM   #10
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I didn't get a manual with the vehicle.
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Old 07-19-2016, 03:48 PM   #11
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2014 Ford E-Series Owner's Manual
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Old 07-19-2016, 05:59 PM   #12
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I thought I had a problem with my 2015 E-450 cruise on my last trip, after slowing down for construction on the highway to about 10mph I accidentally hit the "resume" button. A warning light came on (I forget which one) and the cruise quit working but after shutting down and restarting (with fingers crossed) it reset and worked fine.
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Old 07-20-2016, 07:37 AM   #13
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FWIW I am often shaking my head at some folks approach to big hills or mountains. I keep seeing the same advice to descend at the same speed one ascends then somebody else worrying about not going fast enough. All I know is that most of us old drives are not all that bold about going real fast down hill. I ride down on the engine compression in a lower gear with a bit of brakes here and there on straight sections. If you are behind me I will pull over when I think it is safe for me to do so and let you go by. That means I seldom use cruise anywhere but a long flat stretch where I don't want speed creep getting me in trouble. ;-) FWIW that also means the V-10 is running around 3-4000 rpm where it is happy and I am happy but I grew up on small displacement high revving engines.
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Old 07-20-2016, 09:27 AM   #14
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^^ X2 .

I don't ever want to place myself in a position where I need to worry about how I'm going to climb this hill.....

..
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