Fuel System
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Check the operation of the fuel pump. The pump should turn ON for approximately 2 seconds when the ignition switch is turned to RUN position. See FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS under FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES - 4.0L AURORA article.
- Check for incorrect fuel pressure. See FUEL SYSTEM DIAGNOSIS under FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES - 4.0L AURORA article.
- Check the fuel injectors and related fuses. See FUEL INJECTOR COIL TEST and FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL or FUEL INJECTOR BALANCE TEST WITH TECH 2 under FUEL SYSTEM in SYSTEM & COMPONENT TESTS - 4.0L AURORA article.
- Check for fuel contamination. See ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL or ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 4.0L AURORA article.