September 30: LEMON manuals is back up on a temporary server! Slowness is possible
Poor Fuel Mileage
- Check for fuel leaks.
- Check fuel pressure.
- Check for clogged air filter.
- Check compression.
- Check cooling system condition.
- Check ignition and valve timing.
- Check spark plugs.
- Check for adequate spark with a spark tester.
- Check for high resistance in spark plug wires.
- Check for faulty Throttle Position (TP) sensor.
- Check for faulty Engine Coolant Temperature (ECT) sensor.
- Check for faulty thermostat.
- Check for faulty PCM.
- Check for high idle RPM.
- Check for malfunctioning electronic fuel injection system.
- Check for malfunctioning EGR valve.
- Check for brakes dragging.
- Check for clutch slipping.
- Check for low automatic transmission fluid.
- Check for improper tire pressure.