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.
See SCHEMATIC AND ROUTING DIAGRAMS.
Check intake manifold, and vacuum components.



[1][2]PCV malfunction Check PCV system. Testing and Inspection



Incorrect Spark Advance Check Spark Controls (EST, ESC etc..).