Poor Fuel Economy
- Ensure throttle plate and linkage operate properly.
- Check air intake system.
- Check fuel delivery system. See SYSTEM/COMPONENT TESTS article.
- Check ignition system. See BASIC TESTING article.
- Check for vacuum leaks.
- Check for restricted exhaust system.
- Check EGR system. See SYSTEM/COMPONENT TESTS article.
- Check for slipping clutch.
- Check for dragging brakes.
- Check odometer calibration.
- Vehicle load, driving habits, road and weather conditions can also effect fuel economy.