High HC & CO - at High RPM

This condition indicates abnormally high Carbon Monoxide and Hydrocarbons during cruise (2500 rpm).

POSSIBLE CAUSE ACTION


Electrical misfires ^ Check ignition system


Vacuum leak ^ Check vacuum lines and routing
^ Check intake manifold and vacuum components


Faulty canister purge system ^ Check Fuel Evaporative System.


CCV malfunction ^ Check CCV system.


Restricted exhaust ^ Check Catalytic Converter.


Initial timing incorrect ^ Check distributor Assembly installation


Incorrect Spark Advance ^ Check spark controls.


Fuel Injection malfunction ^ Check fuel pressure
^ Perform injector balance test
^ Inspect regulator operation
^ (check vacuum line and return hose).
^ Service Fuel Injectors (Pressure cleaner)