GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Is there a light knock when the engine is hot?

--

Go to Step 2

System OK

2

Is detonation or spark knock evident?

--

Go to Step 3

Go to Step 4

3

Inspect the engine timing and the fuel quality.

Was the problem found?

--

Go to Step 1

--

4

Inspect the torque converter bolts.

Are the bolts loose?

45 N·m (33 lb ft)

Go to Step 5

Go to Step 6

5

Tighten the torque converter bolts.

Is the repair complete?

--

Go to Step 1

--

6

Inspect the manifold.

Is there an exhaust leak at the manifold?

--

Go to Step 7

Go to Step 8

7

Tighten the bolts or replace the gasket.

Is the repair complete?

--

Go to Step 1

--

8

Measure the rod bearing clearance.

Is the clearance within the specified range?

0.19-0.070 mm (0.0007-0.0028 in)

Go to Step 9

System OK

9

Replace the rod bearings, as necessary.

Is the repair complete?

--

Go to Step 1

--