For 1990-2009 cars only
| • | Detonation or spark knock. Check operation of ignition controls or knock sensor circuit. |
| • | Loose torque converter bolts. |
| • | Exhaust leak at manifold. Tighten the exhaust manifold bolts and/or replace the gasket. |
| • | Excessive connecting rod bearing clearance. Replace bearings as necessary. |
| • | Excessive piston pin clearance. |
| • | Excessive crankshaft thrust bearing clearance. |
| • | Bent connecting rod. |
