For 1990-2009 cars

This condition may be caused by one or more of the following problems:

• | Broken balancer or pulley hub. (Replace all parts.)

• | Loose torque converter bolts. (Retighten to specifications.)

• | Accessory belts too tight or nicked. (Replace and/or set tension to specifications as necessary.)

• | Exhaust system grounded. (Reposition as necessary.)

• | Flywheel cracked. (Replace flywheel.)

• | Excessive main bearing clearance. (Replace as necessary.)

• | Excessive rod bearing clearance. (Replace as necessary.)

• | Low quality fuel.