High HC & CO - at High RPM

This condition indicates abnormally high Carbon Monoxide and Hydrocarbons during cruise (2500 rpm).

POSSIBLE CAUSE ACTION


Electrical misfires Refer to Ignition Systems



Vacuum leak Check vacuum lines and routing
Check intake manifold and vacuum components



PCV malfunction



Restricted exhaust Refer to Catalytic Converter


Initial timing incorrect Check Ignition Timing.
Refer to Ignition System




Fuel metering malfunction Check fuel pressure.
Refer to Fuel Delivery and Air Induction. Testing and Inspection

Inspect regulator operation
(check vacuum line and return hose),

Service Fuel Injectors (Pressure cleaner)