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Fails Emission Test
- Ensure exhaust system is not restricted.
- Check EGR valve and solenoid for correct operation.
- Check fuel-cut system for malfunction. Fuel-cut system includes throttle body dashpot unit, throttle position sensor and coolant thermosensor.
- Check No. 1 and 2 purge control valve operation.
- Check vacuum switching valve operation.
- Check secondary air injection system (B2200 Federal).
- Check airflow meter for cracks.
- Verify correct airflow meter operation and resistance value.
- Check atmospheric pressure sensor.
- Check air valve and ISC switch.
- Ensure fuel system pressure is correct.
- Verify intake air system and throttle body electrical connections.
- Check pressure regulator and pressure regulator solenoid.
- Check water and intake air thermosensors.
- Verify throttle position sensor adjustment.