High CO at High RPM

This condition indicates abnormally high Carbon Monoxide with low or normal Hydrocarbons during cruise (2500 rpm).


POSSIBLE CAUSE ACTION


Faulty bowl vent/canister purge system Check Evaporative System. Testing and Inspection



[1][2]PCV malfunction Check PCV system. Testing and Inspection



EGR malfunction Check EGR system. Testing and Inspection



Restricted exhaust Check for plugged exhaust system. Testing and Inspection



Incorrect Spark Advance Check Spark Controls (EST, ESC, etc...). DTC 42



Fuel metering malfunction Check fuel pressure.
Check pressure regulator operation
(check vacuum line and return hose)
[1][2]Chart A-7 Fuel System Diagnosis
Service Injector (Pressure clean).