Poor Fuel Economy: Sensor/System
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the air intake system and crankcase for air leaks.
- Check for proper calibration of the speedometer. Connect the Signal Generator and Instrument Panel Tester (J 33431-C) to the Vehicle Speed Sensor (VSS) electrical connector. Turn ignition switch to RUN position. With the tester ON, monitor the speedometer.