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, refer to "Schematic And Routing 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, Positive Crankcase Ventilation

Restricted exhaust Check Catalytic Converter, 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.