Poor Fuel Economy
- Check for vacuum leaks.
- Check ignition system. See BASIC TESTING - 4-CYL article in the ENGINE PERFORMANCE section.
- Check air intake system. Also, ensure throttle plate and linkages operate properly.
- Check fuel delivery. Refer to the appropriate I - SYSTEM/COMPONENT TESTS - EEC (2.5L) article in the ENGINE PERFORMANCE section.
- Perform QUICK TEST. See TESTS W/CODES - EEC 2.5L article in the ENGINE PERFORMANCE section.
- Check EGR system. See I - SYSTEM/COMPONENT TESTS - EEC (2.5L) article and TESTS W/CODES - EEC 2.5L article in the ENGINE PERFORMANCE section.
- Check cooling system thermostat.
- Check for slipping clutch.
- Check for dragging brakes.
- Check odometer calibration.
- Vehicle load, driving habits, road and weather conditions can also effect fuel economy.
- Check for restricted exhaust system.
- Check engine compression. Check engine mechanical condition. Check intake manifold, manifold gasket, camshaft and valves.