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 operation.


Fuel in crankcase Determine cause (flooding, excessive cranking etc.).

Change oil and filter.


Fuel Metering Check air/fuel ratio, (Verify O2 Sensor Voltage)

Check fuel pressure.).


Faulty fuel cap Replace fuel cap.


Lead contamination Check for missing fill
of catalytic converter pipe restrictor.

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