The fix here is to replace the worn tires and realign the rear wheels.
If the tread blocks are worn unevenly, you’ll probably feel ridges one way, but not the other. Run your hand around the rear tires to feel for roughness. A simple bubble balancer can’t address either of these. A back-and-forth shimmy in the steering wheel means one or both front wheels are dynamically imbalanced, or a rim is bent. Most tire/wheel imbalance problems will make themselves evident at speeds above 45 to 50 mph. But what about the tenth time when balancing doesn’t cure the shakes? Is it a bent rim, an out-of-round rim or tire, an off-center wheel or hub, or a bent or imbalanced driveshaft? Sometimes the problem is worn shocks or a loose part in the suspension or steering linkage. Nine out of 10 times, speed-sensitive vibrations are due to an out-of-balance wheel. On FWD vehicles, it is necessary to consider all possibilities – click here for details Random noises and vibrations that come and go are often a clue that something is loose or broken and is rattling around. Because the list of potential causes is a long one, don’t jump to conclusions until you’ve performed some preliminary checks.Ī vibration or noise that only occurs when accelerating or coasting typically indicates a problem in the driveline or chassis.Ī vibration or a noise that depends on engine rpm alone should tell you to look in the engine compartment. Focus on the driving conditions that accompany the vibration or sound.Ī vibration that appears above a certain vehicle speed should point you in the direction of the wheels, driveline and suspension. The point is, don’t get bogged down in the semantics of describing the symptom.
That may not be easy because the typical motorist may describe a vibration as anything from a thumping noise to a shudder, rattle or shake. When a customer comes to you with a vibration or noise complaint, the first diagnostic step is to get as accurate a description as possible of what’s happening from your customer.
Random - The vibration/noise comes and goes with no obvious connection to engine rpm, vehicle speed or driving conditions. Vehicle speed sensitive - The vibration/noise only occurs at certain speeds or changes in direct proportion to vehicle speed.Īcceleration/deceleration sensitive - The vibration/noise is only noticed when vehicle speed changes (as when starting out from a stop, passing, slowing down or coasting). The symptom appears or changes in direct proportion to engine rpm. Most vibrations and noises can be classified according to when they occur:Įngine speed sensitive - The vibration/noise is directly related to engine speed and nothing else (not vehicle speed or driving conditions).
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