GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Impala 🢒 Engine 🢒 Engine Mechanical - 3.8L 🢒 Drive Belt Chirping Diagnosis

Step

Action

Yes

No

DEFINITION: The following items are indications of chirping:

    • A high pitched noise that is often heard once per revolution of the drive belt or a pulley.
    • It usually occurs on cold damp mornings.
    • Verify the condition by spraying water on the belt. The noise should stop momentarily.

       Important: Do not use drive belt dressing (adhesion enhancement chemical) or any other chemical on the drive belt.

1

Check for misalignment of the pulleys.

Are any of the pulleys misaligned?

Go to Step 2

Go to Step 3

2

Replace any misaligned pulleys.

Is the chirp still present?

Go to Step 3

System OK

3

Check for bent or cracked brackets.

Are there any bent or cracked brackets?

Go to Step 4

Go to Step 5

4

Replace any bent or cracked brackets.

Is the chirp still present?

Go to Step 5

System OK

5

Check for any loose or missing fasteners.

Are there any loose or missing fasteners?

Go to Step 6

Go to Step 7

6

Tighten any loose fasteners.

Replace any missing fasteners. Refer to Fastener Tightening Specifications .

Is the chirp still present?

Go to Step 7

System OK

7

Check for a bent pulley flange.

Is there a bent pulley flange?

Go to Step 8

Go to Step 9

8

Replace the pulley.

Is the chirp still present?

Go to Step 9

System OK

9

Check for severe pilling, exceeding 1/3 of the belt groove depth.

Is there severe pilling?

Go to Step 10

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10

Replace the drive belt. Refer to Drive Belt Replacement .

Is the repair complete?

--

System OK