When stopped and I turn the wheel.. stuttering sensation felt
05-30-2012, 10:05 PM
#17
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Location: Spring Lake, NJ, US of A
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I somehow doubt that it's related to electronics (mechanics like to throw up the black mystery box theory when they don't have a clue what's really wrong..)
I suspect (and I've had most everything replaced) that there is a bit more compliance in the mounting bushings for the steering rack (one is a rubber through-bushing, the other is a clamp sort of rubber mount) - and when you turn the wheel with the truck not moving, the friction between the tire and the ground is enough that the rack may actually move a tiny but in the bushings in response.. then when the force gets to be enough, the "stiction" of the tire to the surface lets go, and the rack moves back relaxing the bushings/mounts. Repeat and you get a shudder. There may also be some compression/release stuff going on with the wishbone bushings that adds to the fun.
Different tires with different coefficients of friction may cause it to happen to a lesser or greater degree (it won't do it if the tires are on a lower traction surface, like snow, or sand on pavement.)
I think the reason ServoTronic owners notice it more - isn't because of the difference in design, it's because we are more likely to turn the wheel quickly with the vehicle not moving, just because it's so easy to do. I can quite literally go from lock to lock on my P!G with one finger pushing against the spoke of the steering wheel.
Whatever it is - it doesn't actually seem to effect anything except shuddering when not moving. Handling seems fine.. so I've managed to decide to ignore it.
I suspect (and I've had most everything replaced) that there is a bit more compliance in the mounting bushings for the steering rack (one is a rubber through-bushing, the other is a clamp sort of rubber mount) - and when you turn the wheel with the truck not moving, the friction between the tire and the ground is enough that the rack may actually move a tiny but in the bushings in response.. then when the force gets to be enough, the "stiction" of the tire to the surface lets go, and the rack moves back relaxing the bushings/mounts. Repeat and you get a shudder. There may also be some compression/release stuff going on with the wishbone bushings that adds to the fun.
Different tires with different coefficients of friction may cause it to happen to a lesser or greater degree (it won't do it if the tires are on a lower traction surface, like snow, or sand on pavement.)
I think the reason ServoTronic owners notice it more - isn't because of the difference in design, it's because we are more likely to turn the wheel quickly with the vehicle not moving, just because it's so easy to do. I can quite literally go from lock to lock on my P!G with one finger pushing against the spoke of the steering wheel.
Whatever it is - it doesn't actually seem to effect anything except shuddering when not moving. Handling seems fine.. so I've managed to decide to ignore it.
Last edited by deilenberger; 05-30-2012 at 10:06 PM. Reason: Mselling Pistakes
