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 in
Proceed to ADJUSTMENT PROCEDURES

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

Fuel Injected Check air/fuel ratio, (O2 Sensor Voltage)
perform injector balance test,
(check vacuum line and return hose),
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