Braking - Ford Powerstroke Diesel Forum

 
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post #1 of 3 Old 09-19-2010, 02:33 PM Thread Starter
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Braking

I own a 2009 F-250 6.4L diesel and on a recent trip to PA going down hills in the tow/haul mode the rpm's want to jump up to about 3000 or so what is with this and does it harm the motor jumping up that quick. This is my first diesel and it tows more comfortable than my half ton gas did. Thanks for any replies.
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post #2 of 3 Old 09-19-2010, 06:45 PM
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Tow/Haul mode will keep the transmission locked up and will downshift as speed decreases so that engine braking assists your service brakes coming downhill. 3000 RPM is still within the rev-limit, and you're perfectly OK in that range. If you play with the mode, you'll see that it doesn't engage the engine-braking unless you hit the brakes, and it feels (to me) like the more pressure you put on the brakes, the more engine braking is applied as well.

Greg
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post #3 of 3 Old 09-19-2010, 11:48 PM
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Quote:
Originally Posted by hammong View Post
Tow/Haul mode will keep the transmission locked up and will downshift as speed decreases so that engine braking assists your service brakes coming downhill. 3000 RPM is still within the rev-limit, and you're perfectly OK in that range. If you play with the mode, you'll see that it doesn't engage the engine-braking unless you hit the brakes, and it feels (to me) like the more pressure you put on the brakes, the more engine braking is applied as well.

Greg
I second that, Greg is right on the money!

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