Troubleshooting - Suspension and Steering
Symptom-driven guide to diagnosing vibration, rear-end knocking, vehicle pull, and abnormal tire wear on the Porsche 924, 944, and 968.
Difficulty: Easy2 min readApplies to: 924 · 944 · 944S · 944S2 · 944 Turbo · 968
Introduction
This troubleshooting guide is intended to help identify and repair suspension and steering problems. Symptoms covered:
- Vibration or Shake during Driving
- Knock or Thump from Rear End
- Vehicle Pulls to One Side
- Abnormal Tire Wear
Vibration or Shake During Driving
| Possible Cause | Checks | Procedure |
|---|---|---|
| Wheel alignment | Have alignment checked by a wheel/alignment shop. | N/A |
| Tire or wheel out of balance | Have balance checked by a wheel/alignment shop. | N/A |
| Worn ball joints or tie rods | Check ball joints and tie rods for excessive play. | N/A |
| Loose or worn wheel bearings | Check and adjust wheel bearings as necessary. | SUSP-08 |
Knock or Thump From Rear End
| Possible Cause | Checks | Procedure |
|---|---|---|
| CV Joint | Remove axle, inspect CV joint, and repack with fresh grease. | SUSP-01 |
| Transaxle | If the CV joints are not the problem, the noise may be from a transaxle bearing. Have a transmission shop listen to the noise to determine if the transaxle needs to be rebuilt. | N/A |
Vehicle Pulls to One Side
| Possible Cause | Checks | Procedure |
|---|---|---|
| Wheel alignment | Have alignment checked by a wheel/alignment shop. | N/A |
| Uneven tire pressures | Check pressures and adjust if necessary. | N/A |
| Front brake dragging | Raise each side of the vehicle and spin the front wheels to check for brake drag. | N/A |
| Worn strut or shock absorber | Check ride heights from side to side for equal height (measure from the ground to the highest point on the wheel well on each side). | N/A |
Abnormal Tire Wear
| Possible Cause | Checks | Procedure |
|---|---|---|
| Wear on both edges — wheel alignment | Have alignment checked by a wheel/alignment shop. | N/A |
| Tire or wheel out of balance | Have balance checked by a wheel/alignment shop. | N/A |
| Worn ball joints or tie rods | Check ball joints and tie rods for excessive play. | N/A |
| Loose or worn wheel bearings | Check and adjust wheel bearings as necessary. | SUSP-08 |
Tags:suspensionsteeringvibrationtire wearwheel bearingcv jointalignment