– Vacuum leaks resulting in improper MAP sensor operation
– Defective air mass or air flow sensor
– Malfunctioning fuel evaporation system or purge valve
– Defective Catalytic Converter
– Defective thermostat (cooling system), thermostat stuck
open
– Oil contaminated with fuel, excessive miles between oil
changes
HC Failure is the
result of incomplete combustion. Any item that causes incomplete combustion can
result in high HC. The most common causes are:
– Worn spark plugs
– Defective spark plug wires
– Worn distributor cap and/or rotor
– Improper ignition timing, usually over advanced
– Vacuum leaks
– Engine mechanical failure, low compression, worn valves,
excessive oil consumption
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