Symptom Related Diagnostic Procedures

Symptom: Vehicle has excessive "rotten egg" smell. Raw fuel (gasoline) can be smelled. Excessive odors do not necessarily indicate excessive emissions.

POSSIBLE CAUSE ACTION


Faulty purge valve, liquid ^ Check Evaporative emission system.
fuel in charcoal EVAP Canister,
fuel tank vent blocked,
poor seal on gas cap.


PCV valve plugged or stuck ^ Check PCV system.
PCV hose blocked or plugged


Contaminated catalyst ^ Check for missing or worn
fuel fillpipe restrictor.


Incorrect Air-Fuel mixture ^ Check fuel pressure.
^ Check O2 sensor.

^ Perform injector balance test (SFI only).


Excessive Emissions SEE Failed Emissions Diagnosis