Engine braking on 2017 F150 5.0L
I have a 2017 F150 with the 5.0 engine. When I tow my TT in tow haul mode, it seems to me that Ford has overdone it with the engine braking. As I apply the brakes, it downshifts really hard and revs ...
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Lantley wrote:Turtle n Peeps wrote:Lantley wrote:
I'm not suggesting the OP has a problem with their truck. But I can attest to my 07 LBZ Duramax overheating due to excessive revving on steep declines. Is a 2007 a modern truck?
The exhaust brake was aftermarket which may have been the root of the problem. Nevertheless the tranny would and did overheat if you let it.
Any modern diesel truck or gas truck for that matter, cuts all fuel off to the injectors while going down hill. There is no heat being made because there is no combustion going on. This has been going on since 1994.......at least for GM.
That all sounds good, I don't dispute your claim. But that 2007 truck would definitely overheat if you let it. I managed to control the overheating by not letting the truck rev as much on steep declines.
Again it had an after market exhaust brake that could had been faulty and ultimately caused the problem.
My 2019 has a factory exhaust brake and does not have that issue.
To slow a vehicle, a lot of energy must be transformed to heat, and dissipated. Now does it go out thru brakes or engine and drivetrain?
Personally, I know engine temps will drop fast when jake shuts off, and transmission/rearends will cool quickly if soft-pedal for few miles, and the system designed to stop is still in best working order if faced with emergency.
Now something that many overlook is how to reduce the amount of energy that must be dissipated. It takes much less braking, service or engine, to reduce speed from 40 to 30 than 60 to 50MPH. Let speed drop to well below safe as you near start of downhill, then hold the lower speed until near bottom.
