GM Service Manual Online
For 1990-2009 cars only
    • Broken balancer or pulley hub; Replace the parts as necessary.
    • Loose torque converter bolts; Tighten the bolts.
    • The accessory drive belt is too tight or nicked. Replace the drive belt as necessary.
    • The exhaust system is grounded. Reposition the exhaust system components as necessary.
    • The flywheel is cracked. Replace the flywheel as necessary.
    • There is excessive main bearing clearance. Replace the main bearing(s) as necessary.
    • There is excessive rod bearing clearance. Replace the rod bearing(s) as necessary.