For 1990-2009 cars

• | 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.