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Christopher
Dodge Dakota
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2/07/2003
23:57:54
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 Subject: RE: Intermittent Idle Stumbling!!!
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I have a 2002 4.7 auto with 8500 miles in California. My idle stays at 500.
My question is about the light bump felt at a stop. How is the fuel shifting? It feels like the guy behind me tapped my truck very lightly with his bumper. How can that be from a full tank of fuel sloshing around? Can someone explain what is going on? Thanks
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chris
Dodge Dakota
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2/08/2003
12:49:57
|  RE: Intermittent Idle Stumbling!!!
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Message:
one of newtons laws
an object in motion tends to stay in motion untill acted upon by an opposing force
you ,your truck and your fuel are moving at 30mph
you apply the brakes
you feel yourself resisting the weight of your body to continue to move forward
your fuel cant do this so it moves to the front of the fuel tank.when the vehicle stops the fuel is still at the front of the tank,the loss of momentum to go forward results in the fuel ,because its at the front and like most liquids well find its own level, rushing to the back of the tank. because it is moveing it has momentum ,and mass this well give the fuel force. which is why when it hits the back of your tank you feel a tap.
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Ram 1500 Box
Dodge Dakota
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2/08/2003
21:58:22
| RE: Intermittent Idle Stumbling!!!
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There is also another explanation that can be a possible cause. Rear axle wrap-up at stops tips the nose of the rear axle downward when stopping at lights for example. When your vehicle comes to a full stop, in this condition, the nose down attitude of the rear axle will cause the driveshaft to be pulled rearwards on the transmission output shaft. When you release the brake pressure slightly, it allows the suspension to return to it's original position, the nose of the axle returns to it's normal attitude and the driveshaft is pushed forward on the output shaft of the transmission. There have been times when this condition feels as if you were being tapped or bumped from behind, and has been the issue of TSB's in prior year models of full size pickups. The condition causes a slight thump and feels as if someone tapped you in the rear of the vehicle. (and in actuality, in this condition, the driveshaft does as it is pushed back into the tranmission and the front yoke bottoms up against the end of the transmission output shaft)
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Christopher
Dodge Dakota
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2/10/2003
17:44:08
| RE: Intermittent Idle Stumbling!!!
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Message:
thanks for the responses. To me it feels and sounds more like the drive shaft axle suggestion. I have never felt it in another vehicle.
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