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 Check ignition system

Vacuum leak Check vacuum lines and routing, refer to "Schematic And Routing Diagrams"
Check intake manifold and vacuum components

[1][2]PCV malfunction Check PCV system, Positive Crankcase Ventilation

Incorrect Spark Advance Check Spark Controls,

EGR malfunction Check EGR system.