Boost Gauge Indicates higher than normal Boost
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Check supercharger bypass control intercooler system. For supercharger bypass control, go to TEST KJ: SUPERCHARGER BY-PASS CONTROL , step 1) . For intercooler system, go to TEST KP: CHARGE AIR COOLER PUMP , step 7) .