Abnormal Noise Or Knocking (EFI)

• Check engine oil level.

Check Electronic Spark Advance (ESA) control system for malfunctioning component. ESA system inspection should include the following components:

• Airflow meter
• Idle switch
• Neutral safety switch (A/T)
• Clutch switch (M/T)
• EGR position sensor
• Knock sensor
• Throttle position sensor
• Coolant thermosensor
• Coolant thermoswitch
• Inhibitor switch (A/T)
• Electronic Controlled Automatic Transmission (ECAT) unit.

Check turbo system for damage or wear (if equipped). Turbo system inspection should include the following components:

• Air by-pass valve
• Engine Control Unit (ECU)
• Intake air thermosensor in airflow meter
• Knock sensor and knock control unit
• Turbo wastegate solenoid valve.