GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Does the engine knock when it is cold and continue for 2-3 minutes or does the knock increase with torque?

--

Go to Step 2

System OK

2

Inspect the flywheel.

Is the flywheel contacting the splash shield?

--

Go to Step 3

Go to Step 4

3

Reposition the splash shield.

Is the repair complete?

--

Go to Step 1

--

4

Inspect the balancer and the drive pulleys.

Is either the balancer or the drive pulleys loose or broken?

--

Go to Step 5

Go to Step 6

5

Tighten or replace the balancer or the driver pulleys.

Is the repair complete?

--

Go to Step 1

--

6

Inspect the piston-to-bore clearance.

Is the clearance more than the value specified?

0.015-0.027 mm (0.00059-0.00106 in)

Go to Step 7

Go to Step 8

7

Measure the diameter of the piston.

Is the diameter greater than the specification?

76.973-77.015 mm (3.0323-3.0320 in

Go to Step 8

Go to Step 9

8

Replace the piston and rings.

Is the piston-to-bore clearance still more then the specified value?

--

Go to Step 10

Go to Step 11

9

Measure the diameter of the cylinder bore.

Is the diameter greater than the specification?

76.994-77.006 mm (3.0313-3.0317 in

Go to Step 10

Go to Step 11

10

Replace the cylinder block.

Is the repair complete?

--

Go to Step 1

--

11

Inspect the connecting rod.

Is the connecting rod bent?

--

Go to Step 12

System OK

12

Replace the connecting rod.

Is the repair complete?

--

Go to Step 1

--