Excessive Emissions or 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 and adjust idle speed, refer to Adjustments

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

Fuel Metering - Check fuel pressure
- Check air/fuel ratio (O2 Sensor Voltage)
- Perform Injector Balance Test
- Check vacuum line and return hose

Faulty fuel cap - Replace fuel cap

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

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