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Normal Plug Normal Worn Plug
    A plug displaying normal wear will have gray/brown deposits and a lightly coated core nose. Gap increased by approximately 0.001" for every 1000 miles driven. These plugs are well suited to the engine and the engine is in good running condition.

Carbon Fouling Carbon Fouled Plug
    Plug displays dry black sooty deposits. Will cause weak spark and eventually misfire. Indicates an overly rich fuel mixture.

Oil Fouling Oil Fouled Plug
    Wet, oily deposits. Will cause weak spark and eventually misfire. Can be caused by worn bores or piston rings, valve guides or sometimes (temporarily) during engine break-in period.

Overheating Overheating
    Electrodes have a glazed appearance, core nose is very white with few deposits. Check plug heat range, ignition timing, fuel octane rating (too low) and fuel mixture (too weak). Discard plugs and cure fault immediately.

Electrode Damage Electrode Damage
    Electrodes burned away; core nose has burned, glazed appearance. Caused by pre-ignition. Same checks as for "Overheating" but may be more severe. Replace plugs and remedy fault before piston or valve damage occurs.

Split Nose Split Core Nose
    (May appear initially as a crack) Damage is self-evident, but cracks will only show after cleaning. Caused by pre-ignition or improper gap-setting technique. Check ignition timing, cooling system, fuel octane rating (too low) and fuel mixture (too weak). Discard plugs and rectify fault.