Excessive Odors - Fuel, Emissions

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 Fuel
fuel in charcoal canister, Evaporative
fuel tank vent blocked, system
poor seal on gas cap Evaporative Emissions System


PCV valve plugged or stuck ^ Check PCV system, Positive Crankcase Ventilation
[1][2]PCV hose blocked or plugged


Contaminated catalyst ^ Check for missing or worn fuel fillpipe restrictor


Incorrect Air-Fuel mixture ^ Check Air-Fuel ratio, O2 sensor, perform injector balance test, inspect regulator operation (check vacuum line and return hose), check fuel pressure


Excessive Emissions ^ Failed Emissions Diagnosis