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Hydrocarbons Listed on the VIR as HC

Hydrocarbons Listed on the VIR as HC. Raw fuel is primarily made up of Hydrocarbons (HC). Should be almost completely broken apart by the combustion process. If there is a lack of combustion (misfire), some of the Hydrocarbons pass through unburned and out the tailpipe.

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Hydrocarbons Listed on the VIR as HC

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  1. HydrocarbonsListed on the VIR as HC Raw fuel is primarily made up of Hydrocarbons (HC). Should be almost completely broken apart by the combustion process. If there is a lack of combustion (misfire), some of the Hydrocarbons pass through unburned and out the tailpipe. Variations in the combustion event (imperfect combustion) allow HC’s to pass through unburned. Catalytic Converter can only deal with a normal amount of HC’s.

  2. Causes of high HCHigh HC’s are always caused by misfires, but the root cause may be any of the following: • Engine integrity issues (lack of compression, lack of vacuum). • Ignition timing. • Ignition system malfunctions. • Rich misfires (high fuel pressure, regulator and/or injector leaks). • Lean misfires (low fuel pressure, dirty injector, vacuum leaks). • Poor fuel vaporization. • Air Injection system malfunction. • Excessive EGR. • Catalytic Converter operation

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