Anyone, anyone??? What would cause the power steering to "pulse" or shutter like this?
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Updated info. on shutter/vibration
Ok, I posted a while back about a shutter/vibration coming from my truck at very low speeds (at just above an idle) while turning. Several people suggested that it may be the limited slip rear end chattering. Well, I think I have isolated the symptoms today while driving through a parking lot.
I'm pretty sure its either coming from my power steering pump or brakes (don't really think brakes though since it won't do it while moving in a straight line). Either that or turning the wheel is causing a shutter in my drivetrain for some other reason (pressure put on a u joint, etc.). Anyway, here's what happened today...
Pulling forward out of my parking space (which I am backed into)- start truck, put into gear (auto), idle off just a bit while still holding the truck back with the brake, turn steering wheel a good bit but not maxed out, and the shutter/vibration starts. I can feel the shutter as if its in the power steering pump/steering wheel and also through my seat. I let the wheel straighten up and the shutter stops. If you apply the break the rest of the way and come to a complete stop, even with the wheel still turned, the shutter stops. Its like it shutters when the wheel is turned and your holding the truck back with the brake to prevent it from moving at full idle speed.
I then tried to make it shutter with the wheel straight simply by applying the breaks at various low speeds until eventually stopped and it won't shutter. I then went to another store and it shuttered while I was backing out of a parking space since I was on the brake and turning the wheel at the same time. I also noticed that once you give it some throttle and you get just above idle speed, it will stop shuttering.
My powersteering seems to work fine and it is not hard to turn at all. No squeals or audible whines. Sometimes at lower speeds it does feel as though the steering wheel is rubbing something while turning, but its very slight and not a problem.
Any idea what this is? I do have a lite oil leak from the vaccum pump but that the only issue that I know of. Could this be a result of the vaccum pump not doing its job properly due to the leak? If this is being caused by the power steering pump, does this mean that its likely going out? Any advice is greatly appreciated.
I'm pretty sure its either coming from my power steering pump or brakes (don't really think brakes though since it won't do it while moving in a straight line). Either that or turning the wheel is causing a shutter in my drivetrain for some other reason (pressure put on a u joint, etc.). Anyway, here's what happened today...
Pulling forward out of my parking space (which I am backed into)- start truck, put into gear (auto), idle off just a bit while still holding the truck back with the brake, turn steering wheel a good bit but not maxed out, and the shutter/vibration starts. I can feel the shutter as if its in the power steering pump/steering wheel and also through my seat. I let the wheel straighten up and the shutter stops. If you apply the break the rest of the way and come to a complete stop, even with the wheel still turned, the shutter stops. Its like it shutters when the wheel is turned and your holding the truck back with the brake to prevent it from moving at full idle speed.
I then tried to make it shutter with the wheel straight simply by applying the breaks at various low speeds until eventually stopped and it won't shutter. I then went to another store and it shuttered while I was backing out of a parking space since I was on the brake and turning the wheel at the same time. I also noticed that once you give it some throttle and you get just above idle speed, it will stop shuttering.
My powersteering seems to work fine and it is not hard to turn at all. No squeals or audible whines. Sometimes at lower speeds it does feel as though the steering wheel is rubbing something while turning, but its very slight and not a problem.
Any idea what this is? I do have a lite oil leak from the vaccum pump but that the only issue that I know of. Could this be a result of the vaccum pump not doing its job properly due to the leak? If this is being caused by the power steering pump, does this mean that its likely going out? Any advice is greatly appreciated.
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Brakes feel solid, no vibration or feed back. The only factor the brakes seem to play is that when they are applied at idle speed and the wheel is turned, the shuttering in the steering wheel/drivers seat starts. When the brakes are applied fully so that the vehicle stops rolling, the shuttering stops.Air in the lines or a dying pump is all i can think of. How does the brake pedal feel when you have the wheel like that or when its shuddering
I really think its my powersteering pump but it only acts like this at very low speeds when the wheel is turned. I'm gonna try draining the PS fluid and using some Royal Purple or something good like that to see if it helps. Anyone have a write up on changing the PS fluid?
I have not. I'll try to figure something out as I know nothing about how they work. Would they cause this type of pulsing/shuttering only when the wheel was turned?Have you checked your ball joints?
They sometimes need to be re-torqued. My lowers didn't have the cotterpin set-up and would need re-torquing.
That makes sense, when the wheel is turned and puts some pressure on them, it makes them pulse or shutter. I'll try to get them checked out. Thanks for the information.I think so. But-my truck was fine in 2wd but would buck in 4wd when steering. It was so bad that I was sure it was a bad u-joint. Turned out to be my passenger lower ball joint had gone bad, and whore out the tapered hole in the steering knuckle.
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