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. SEE Diagrams Check intake manifold
and vacuum components


Faulty canister purge system ^ Check Fuel Evaporative System. Evaporative Emissions System


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


Restricted exhaust ^ Check Catalytic Converter. 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)


EGR malfunction ^ Check EGR system. Exhaust Gas Recirculation