High CO - at High RPM

Condition: High Carbon Monoxide, normal or low Hydrocarbons during cruise (2500 rpm).

POSSIBLE CAUSE ACTION


Faulty canister purge system ^ Check Fuel Evaporative System.


Restricted exhaust ^ Check Catalytic Converter.


EGR malfunction ^ Check EGR system.


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


Initial timing incorrect ^ Check base timing.

^ SEE IGNITION SYSTEM/ ADJUSTMENT PROCEDURES.

^ Check cam timing.


Incorrect Spark Advance ^ Check Spark Controls.

^ SEE IGNITION SYSTEM/ TIMING SPECIFICATIONS


Fuel Injection malfunction ^ Check fuel pressure.

^ Perform injector balance test.

^ Service Fuel Injectors (Pressure cleaner).