High HC - at High RPM

This condition indicates abnormally high Hydrocarbons with low or normal CO during cruise (2500 rpm).

POSSIBLE CAUSE ACTION


Electrical misfires Refer to Ignition Systems, Testing and Inspection



Vacuum leak Check vacuum lines and routing


PCV malfunction Refer to Positive Crankcase Ventilation, Positive Crankcase Ventilation



Initial timing incorrect Check the On-Board Diagnostic System for fault codes. Refer to Computers and Control Systems, Testing and Inspection