At highway speeds - 55-70 i am getting a steeering wheel shimmy even though all wheels are properly balanced. The vehicle has 8500 miles and problem started after wheels where rotated at 7500. Good Year claims tires show no flat spots and wearing evenly. 2 Pontiac service dealers are stumped and state no bulletin regarding this type of problem has been issued by Pontiac-GM. Please provide advice on how to correct this nagging problem.
I had a 2008 Supercrew that had that prob. One of the tires was defective. It balanced ok but at speed would vibrate. The dealer sent me to Discount Tire. They have a machine that will detect problems like yours. I don't remember the name of the machine. Have your dealer take it or send you there. I would think Goodyear would have the same equipment but maybe not. Good luck!
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Is there any evidenced or knowledge of this vehicle having been in an accident? It's possible that a half shaft is bent (although seemingly unlikely) or maybe the carrier bearing for the driveshaft is bad.
If none of the parts you replaced made a difference, I'd be considering bearings. Is the shimmy felt mostly in the body of the vehicle or in the steering wheel? If mostly in the body, the issue is probably related to the rear axle. If the steering wheel shakes, the issue is likely related to the front axle.
This sounds like tie rod ends are going out. Before you remove the old ones, mark on the threads where it currently is seated or you will throw it out of alingment when you put new ones on. You may need to borrow or buy the tool for poping out the tie rod end. They aren't a big deal to change if you have some basic tools and sometimes you don't need the wedge tool either. Once you get the old one out, try moving it around. If it is real loose and moves easily, thats your problem. But the swaying you are describing sound like this is the problem. Could be you steering control arms as well but because the inside of the tires are worn I doubt it.
If it shimmies with the brakes applied, it's a rotor problem....but like you say, it shimmies just at a certain speed with no brakes applied, check tires for out-of-roundness. If they look ok, you are looking at a balance problem with the tires.
Alignment has alot to do with the tires not shimmying.. Like zero toe setting. Loose componants like tie rod ends and the idler ar worn. You can ck for excess front end play by holding the front and back of the wheel and pushing and pulling on it, like rocking it. OR have someone rock the steering while you watch where the play is from underneath. By rocking I mean turn the steering wheel back and forth. Look at all th joints and pivot points for excess play, which is, movement not immediate to the rest of the steering system. Tire balance is very important. Wheel hop is a sign of a bad tire and it overtaxes the shock absorber. Shocks don't cause shimmy because they are a vertical movement controlA shimmy is lateral or side to side.Wheel balance weights must be spit. If a 2 oz. weight is needed to balance the tire, Oe once should be on the inside of the wheel and one ounce on the outside directly across from each outher.. Loose wheel brgs will cause shimmy, but they would not last long. Caster setting on the wheel alignment will also cause shimmy. Like on a shopping car. too much caster causes the wheel to start fluttering and is very hard on other componants. This may be why you have worn tie rod ends and a bad pitman arm. Worn control arm bushings and ball joints directly affect titre wear and can only be feltwhen the front end hits a dip and detected by side wear on the tire edges. Summary: replace the tie rod end and have the car aligned. Good Luck, -Ned_ sorry about the book
Uneven tyre wear can only really be caused by either worn suspension or steering components, or wheel alignment angles incorrect. The best way to check this out is to get a wheel alignment carried out by a reputable specialist, as they will (or certainly should) go over your suspension and steering first to make sure there are no faults before they reset the wheel alignment. The other thing to note is that if the uneven tyre wear is bad enough
the wheel alignment won't fix the wear problem, just slow it down. The shimmy could be caused by a couple of things (driveshaft out of balance, tyre fault, wheel balance) but the best thing to do initially is get the wheels balanced first and see if that fixes the problem, and then go from there. The same company should be able to both the alignment and balance, and these jobs should both be done periodically (at least whenever you replace tyres) to improve tyre life and make the vehicle easier and nicer to drive.