Excessive Exhaust Emissions (Odors)

Definition: Vehicle fails an emission test. Vehicle has excessive "rotten egg" smell. Excessive odors DO NOT necessarily indicate excessive emissions.

POSSIBLE CAUSE ACTION


Incorrect idle speed ^ Check Idle Air Control (IAC) valve.
^ Check Throttle Valve Minimum Position.



Fuel in crankcase ^ Determine cause (flooding, excessive cranking etc.)
^ Change oil and filter
^ Check PCV system for contamination
^ Check EVAP system



Fuel Metering ^ Check air/fuel ratio, (Verify O2 Sensor Voltage)
^ Perform injector balance test,
^ Check fuel pressure,



Faulty fuel cap ^ Replace fuel cap



Lead contamination ^ Check for missing fill pipe restrictor
of catalytic converter ^ Replace catalytic converter if contaminated.



Poor or contaminated fuel ^ Check for excessive alcohol content,
^ Recommend higher grade fuel
^ Drain fuel tank and add clean fuel,