GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Optra 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Piston Noises

Step

Action

Yes

No

1

Listen for the following noises:

    • A sharp double knock when the engine is idling
    • A light ticking with no load on the engine
    • A slapping noise when the engine is cold?

Are any of these noises heard?

Go to Step 2

System OK

2

Inspect the piston pin and the bushing.

Is the piston pin or the bushing worn or loose?

Go to Piston, Connecting Rod, and Bearing Replacement

Go to Step 3

3

Inspect the piston.

Is the piston broken or cracked?

Go to Piston, Connecting Rod, and Bearing Replacement

Go to Step 4

4

Inspect the connecting rods.

Is there a misaligned connecting rod?

Go to Piston, Connecting Rod, and Bearing Replacement

Go to Step 5

5

Inspect the piston position.

Is the piston 180 degrees out of position?

Go to Piston, Connecting Rod, and Bearing Replacement

System OK