High CO and HC at Idle

This condition, at idle, indicates abnormally high Carbon Monoxide and Hydrocarbons.

POSSIBLE CAUSE ACTION


VERY RICH Air-Fuel mixture Check Air/Fuel ratio,
inspect pressure regulator operation
(check vacuum line and return hose),
check fuel pressure. [1][2]Chart A-7 Fuel System Diagnosis



Faulty Fuel Evaporative system Check Fuel Evaporative system
Testing and Inspection



Fuel in crankcase being Remove [1][2]PCV from crankcase
sucked through PCV valve and retest emissions.