Manufactures Proprietary Terms Champion PowerSport Champion Stainless Steel Plugs EZ Start Conversion Charts Displacement Conversion Chart Heat Range Interchange (NGK-Denso-Champion-Bosch) Center Electrodes Fine wire Tapered Ground Electrodes V-trimmed Angled ground Cut back ground Multi-ground Resistor Types Resistor Inductive resistor Q-type suppressor Resistor Q-type suppressor Precious Metal Types Iridium Platinum Gold palladium Plug Problems Breakage Erosion Lead Erosion Lead Fouling Melting Normal Plug Wear Overheating Shadowing Fouling Bridging Deposits Pre-ignition Flashover Quenching Plug Properties Thread Reach Hex Terminal Seat Center electrode Ground electrode Copper core Diameter Ignition Anachronism Wasted Spark Ignition Radio Frequency Interference RFI Distributorless Ignition System DIS Capacitor Discharged Ignition CDI Resistor Glow Plugs After Glow Manufacturer's Numbering System Champion

Wet fouled plug Dry fouled plug Fouling occurs when the spark plugs' firing tip becomes coated with excessive fuel, oil, or combustion deposits so that it is unable to produce a spark. A plug can become fouled from continuous low speed driving, improper spark plug heat range (too cold), improper timing (over-retarded), too rich an air/fuel ratio or an oil leak into the combustion chamber. A variety of self-cleaning features are designed into most plugs to reduce fouling.

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