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Spark Plugs – Carbon Fouled

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Soft, black, sooty deposits easily identify this plug condition. This is most often caused by an over-rich, air/fuel mixture.
Check for a sticking choke, clogged air cleaner, or a carburettor problem – float level high, defective needle or seat, etc.

This may also be attributed to weak ignition voltage, an inoperative preheating system (carburettor intake air), or extremely low cylinder compression.
 

 carbon3

More information On Basic Car Maintenance CD Rom
Information supplied by Champion Sparkplugs ©2009

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