GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the tires.

Are the tires mismatched or uneven?

--

Go to Road Test in Vibration Diagnosis and Correction.

Go to Step 2

2

Inspect the tire inflation pressures.

Are the inflation pressures unequal?

--

Go to Tire and Wheel Specifications in Maintenance and Lubrication.

Go to Step 3

3

Inspect the springs.

Are the springs broken or sagging?

--

Go to Automatic Level Control System Operation Check in Front Suspension.

Go to Step 4

4

Inspect the radial tire lateral force.

Is the radial tire lateral force abnormal?

--

Go to Tire and Wheel Vibration in Vibration Diagnosis and Correction.

Go to Step 5

5

Inspect the front and rear wheel alignment.

Is the wheel alignment incorrect?

--

Go to Wheel Alignment Specifications in Wheel Alignment.

Go to Step 6

6

Inspect the valve and the pinion.

Is the valve or the pinion unbalanced?

--

Go to Automatic Level Control System Operation Check

Go to Step 7

7

Inspect the front brakes.

Are the front brakes dragging?

--

Go to Brake Pedal Travel in Hydraulic Brakes.

Go to Step 8

8

Inspect the ball joints.

Is high friction evident?

--

Go to Lower Control Arm Ball Joint Replacement in Front Suspension.

Go to Step 9

9

Inspect the strut mounts.

Is high friction evident?

--

Go to Strut Assembly Replacement in Front Suspension.

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