Posted by Destroked 450 on October 14, 2018 at 09:07:12 from (66.38.93.182):
In Reply to: Prancing Peterbilt. posted by showcrop on October 13, 2018 at 15:49:22:
As you know fire truck tanks are baffled to help reduce slosh, ours is baffled into 4' x 4' sections. I seriously doubt want your experiencing is caused by water slosh.
I have experienced the bucking motion you described in our old Mack tanker and in my F-450 when pulling my GN trailer over rough roads. What I found was when the truck hits a bump my foot was inadvertently moving the throttle pedal causing the engine to react to the changes in throttle input, each time the truck bucked my foot would move resulting in what I call throttle bounce. to correct it I'd take my foot off of the throttle or mash it to the floor to get the truck to settle down.
Next time you drive it and it starts bucking or prancing as you say let up on the throttle or mash in to the floor and see if it settles down.
If not and you still have to mash on the brakes I'd say some of the motion sensors are fighting each other.
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