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

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).