High Fuel Consumption
- Check fuel system for leaks.
- Check oxygen sensor control circuit.
- Check cold-start valve.
- Check injector fuel pressure and volume.
- Check airflow sensor lever adjustment and control plunger.
- Check throttle potentiometer.
- Check injector fuel pressure and volume.
- Check full throttle switch.
- Check mass airflow sensor (if equipped).
- Check intake air preheating system.
- Check exhaust system for leaks (between cylinder and oxygen (O2) sensor).
- Check ignition timing.