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 and adjust idle speed. [1][2]Adjustments

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

Fuel Injected Check air/fuel ratio.
check fuel pressure.

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. Alcohol In Fuel Test
Recommend higher grade fuel
Drain fuel tank and add clean fuel