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
SEE ADJUSTMENT PROCEDURES

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

Fuel Injected Check air/fuel ratio, SEE
COMPUTERS AND CONTROL SYSTEMS Computers and Control Systems

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

Recommend higher grade fuel

Drain fuel tank and add clean fuel