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BMW Tech and Performance
Chassis and Wheels Tech
Diagnosing Causes of Steering & Suspension Vibrations
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<blockquote data-quote="airtube" data-source="post: 736342" data-attributes="member: 11123"><p>Diagnostic Chart / Checklist for Steering and Suspension Noise or Vibration</p><p></p><p></p><p></p><p>CAUSES RELATED TO VEHICLE SPEED:</p><p></p><p>* Wheel/tire imbalance</p><p></p><p>* Bent rim</p><p></p><p>* Out-of-round tire and/or rim</p><p></p><p>* Driveshaft imbalance (RWD primarily)</p><p></p><p>* Driveshaft bent</p><p></p><p>* Defective or misaligned U-joint</p><p></p><p>* Defective CV joint</p><p></p><p>* Excessive driveshaft angle (4x4 trucks)</p><p></p><p>* Worn wheel bearings</p><p></p><p>* Exhaust vibration</p><p></p><p>* Missing chassis/drivetrain damper weights</p><p></p><p>CAUSES RELATED TO ACCELERATION, DECELERATION & SPEED CHANGES:</p><p></p><p>* Worn differential/transmission/transaxle gears or bearings</p><p></p><p>* Loose/worn suspension components</p><p></p><p>* Engine vacuum leaks</p><p></p><p>* Exhaust backfiring</p><p></p><p>* Torque converter clutch lockup & release</p><p></p><p>* Loose/broken motor, transmission or transaxle mounts</p><p></p><p>CAUSES RELATED TO ENGINE RPM:</p><p></p><p>* Loose/broken motor mounts</p><p></p><p>* Engine misfire</p><p></p><p>* Loose/broken accessory mounting bracket</p><p></p><p>* Defective accessory shaft bearings</p><p></p><p>* Damaged cooling fan or clutch</p><p></p><p>* Loose/worn V-belt</p><p></p><p>* Defect in power steering system</p><p></p><p>* Loose/missing torque converter bolts</p><p></p><p>Deep DeEp @ Heisenberg</p></blockquote><p></p>
[QUOTE="airtube, post: 736342, member: 11123"] Diagnostic Chart / Checklist for Steering and Suspension Noise or Vibration CAUSES RELATED TO VEHICLE SPEED: * Wheel/tire imbalance * Bent rim * Out-of-round tire and/or rim * Driveshaft imbalance (RWD primarily) * Driveshaft bent * Defective or misaligned U-joint * Defective CV joint * Excessive driveshaft angle (4x4 trucks) * Worn wheel bearings * Exhaust vibration * Missing chassis/drivetrain damper weights CAUSES RELATED TO ACCELERATION, DECELERATION & SPEED CHANGES: * Worn differential/transmission/transaxle gears or bearings * Loose/worn suspension components * Engine vacuum leaks * Exhaust backfiring * Torque converter clutch lockup & release * Loose/broken motor, transmission or transaxle mounts CAUSES RELATED TO ENGINE RPM: * Loose/broken motor mounts * Engine misfire * Loose/broken accessory mounting bracket * Defective accessory shaft bearings * Damaged cooling fan or clutch * Loose/worn V-belt * Defect in power steering system * Loose/missing torque converter bolts Deep DeEp @ Heisenberg [/QUOTE]
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