High CO and HC - at Idle

This condition, abnormally high Carbon Monoxide and Hydrocarbons at idle, may indicate a problem in one or more of the areas listed below.

POSSIBLE CAUSE ACTION
Very rich Air/Fuel ratio


Feedback system malfunctioning, Check oxygen sensor and feedback system
or not operating in closed loop

Leaking fuel injector(s) Refer to INJECTOR BALANCE CHART C-2A.
.

Excessive fuel system pressure Check fuel pressure regulator and vacuum hose.



Faulty Fuel Evaporative system Check Fuel Evaporative system.



Fuel in crankcase being Remove PCV from crankcase
sucked through PCV valve and retest emissions.