GM Service Manual Online
For 1990-2009 cars only

Light knock hot may be caused by one or more of the following conditions:

    • Loose torque converter bolts--tighten the bolts. Replace the components if necessary.
    • Exhaust leak at the manifold--tighten the bolts. Replace the gasket if necessary.
    • Excessive rod bearing clearance--replace the bearings as necessary.
    • Detonation or spark knock--refer to Engine Controls.