Poor Fuel Mileage
- Ensure base timing is correct and timing advance system is functional.
- Ensure fuel system pressure is correct.
- Check air conditioner switch operation.
- Check airflow sensor voltage output.
- Check barometric pressure sensor voltage output.
- Check engine coolant temperature sensor operation.
- Check idle position switch operation.
- Check ignition switch operation.
- Check inhibitor switch operation (auto. trans.).
- Check injector operation.
- Check intake air temperature sensor operation.
- Check motor position sensor operation.
- Check Oxygen (O2) sensor operation.
- Check power steering oil pressure switch operation.
- Check throttle position sensor operation.
- Check TDC sensor or No. 1 cylinder TDC sensor operation.