Excessive Fuel Consumption
- Check ignition timing and ignition circuit.
- Ensure cooling system is reaching normal operating temperature.
- Check Engine Coolant Temperature (ECT) sensor.
- Check Idle Air Control (IAC) Valve.
- Check fuel injectors.
- Check fuel evaporative emission circuit.
- Check Exhaust Gas Recirculation (EGR) system.
- Check front Heated Oxygen Sensor (HO2S).
- Check Throttle Position (TP) sensor adjustment and circuit.
- Check main power supply and ground circuits.
- Check engine mechanical condition.