Abnormal Noise Or Knocking

• Check engine oil and coolant level.
• Check turbo system (if equipped) for damage and wear.
• Check engine control system for malfunctioning components.

System inspection should include following components:

• Airflow Meter
• Vacuum Routing (For Leaks)
• EGR Valve Position Sensor (If Equipped)
• Knock Sensor (If Equipped)
• Throttle Position Sensor
• Coolant Temperature Sensor
• Coolant Thermoswitch
• Inhibitor Switch (A/T)
• Electronic Controlled Automatic Transmission (ECAT) Unit