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 speed adjustments.

Fuel in crankcase - Determine cause (flooding, excessive cranking etc.)
- Change oil and filter

Fuel metering - Check air/fuel ratio, measure the 02 sensor signal voltage.
- Perform injector service (cleaning).
- Check fuel pressure (check return hose).

Faulty fuel cap - Replace fuel cap

Lead contamination of catalytic converter - Check for missing fill pipe restrictor
- Replace catalytic converter

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