Fuel System Checks
- Discuss with the owner the type, quality, and alcohol content of the fuel. Oxygenated fuels have lower energy and may deliver reduced fuel economy. 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 - 2.2L ION article.
- Check the fuel injectors. See FUEL INJECTOR COIL TEST under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 2.2L ION article.
- Check for incorrect fuel pressure. See FUEL SYSTEM DIAGNOSIS under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - 2.2L ION article.
- Check for a restricted fuel filter. See FUEL SYSTEM DIAGNOSIS under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - 2.2L ION article.
- Check for a contaminated fuel condition. 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 - 2.2L ION article.
- Check that each fuel injector harness is connected to the correct injector and cylinder. Relocate the injector harnesses as necessary.