GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

DEFINITION: A loud bang or thump that can usually be felt and/or heard when the vehicle is driven over bumps. This condition is commonly noticed when the vehicle trim height is too low.

1

Did you review the General Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Suspension General Diagnosis

2

Verify that the suspension bottoms.

Does the vehicle operate normally?

System OK

Go to Step 3

3

Inspect for vehicle overloading and correct the overloading condition as necessary. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label for specifications.

Did you find and correct the condition?

Go to Step 6

Go to Step 4

4

Inspect the following components:

    • Inspect the shock absorbers. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle
    • Inspect for damaged coil springs, torsion bar or leaf springs and replace as necessary.

Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

Inspect the vehicle trim height. Refer to Trim Height Inspection.

Did you complete the trim height inspection procedure?

Go to Step 6

--

6

Operate the vehicle in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3