High HC and 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 in
Check intake manifold
and vacuum components



Faulty canister purge system Check evaporative system



[1][2]PCV malfunction Check PCV system



EGR malfunction Check EGR system in



Restricted exhaust Check catalytic converter



Initial timing incorrect Check ignition timing



Incorrect Spark Advance Check spark controls (EST-ESC)



Verify vehicle remains in Perform Self-diagnostic procedures
Closed Loop at steady throttle
(2500 rpm) and oxygen sensor
is working




Fuel metering malfunction Check fuel pressure
Perform injector balance test
Inspect regulator operation
(check vacuum line and return hose),
Service fuel injectors (Pressure cleaner)