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

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

Incorrect air/fuel ratio Check air/fuel ratio.

Incorrect fuel pressure 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.
Drain fuel tank and add clean fuel

Leaking fuel injector(s) - Poor injector spray pattern Check fuel injectors