Engine Does Not Run Smooth At Cold Condition

Check the following components or conditions:

• Stored trouble codes.
• Ignition system and timing.
• Inspect air intake system for leaks.
• Idle speed and throttle sensor.
• Check fast idle system.
• Primary injector operation (non-turbo).
• Main fuel line pulsations to indicate operation (turbo).
• Check double throttle system (turbo).
• By-pass Air Control System (BAC).
• Air control valve operation.
• Fuel pump control system (turbo).
• Check variable resistor.
• Purge control valve.
• Coolant thermosensor.
• EGR valve operation.
• Airflow meter operation.
• Intake air temp. sensor in airflow meter.
• Fuel pressure and fuel leaks.
• ECU operation.
• Engine compression.
• Check injection volume.