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Fuel System

  1. Check for incorrect fuel pressure. Go to FUEL PRESSURE TEST under FUEL SYSTEMS in BASIC DIAGNOSTICS PROCEDURES - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
  2. Check the fuel injectors. Go to FUEL INJECTOR CIRCUIT DIAGNOSIS , FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL or FUEL INJECTOR BALANCE TEST WITH TECH 2 under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
  3. Check for a contaminated fuel condition. Go to ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITH SPECIAL TOOL or ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS WITHOUT SPECIAL TOOL under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
  4. Verify that each injector harness is connected to the correct injector or cylinder. Relocate injector harnesses as necessary.
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