High CO - at High RPM

This condition indicates abnormally high Carbon Monoxide with low or normal Hydrocarbons during cruise (2500 RPM).


POSSIBLE CAUSE ACTION


Faulty canister purge system ^ Check Fuel Evaporative System


[1][2]PCV malfunction ^ Check PCV system.


Restricted exhaust ^ Check Catalytic Converter


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)


EGR malfunction ^ Check EGR system