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.
Evaporative Emissions System

[1][2]PCV malfunction Check PCV system.
Positive Crankcase Ventilation

Restricted exhaust Check Catalytic Converter.
See Plugged or Restricted Exhaust Testing.

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).