Poor Fuel Mileage
- Ensure base timing and timing advance system is functional.
- Ensure fuel system pressure is correct.
- Check cold start valve for leaking (engine warm).
- Check thermo time switch operation.
- Check airflow sensor voltage output.
- Check air induction system for leaks.
- Check fuel injector operation.
- Check engine coolant temperature sensor operation.
- Check Oxygen (O2) sensor operation.