High CO and HC - At Idle

This condition, at idle, is indicated by abnormally high carbon monoxide and hydrocarbon emissions.

POSSIBLE CAUSE ACTION



ECCS system malfunction. Refer to On Board Diagnostics Computers and Control Systems


Faulty evaporative emission control system. Evaporative Emissions System



Fuel in crankcase being Remove PCV from crankcase
sucked through PCV valve. and retest emissions. For additional testing, Positive Crankcase Ventilation



Electrical misfires. Check ignition system. Ignition System