• | 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. |