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Spark Plug Diagnosis Chart

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spark_plug_annalysis_dig_1a

NORMAL

Symptoms: Brown to grayish-tan and slight electrode wear. Correct heat range for engine ad operating conditions.

Recommendations: When new spark plugs are installed, replace with plugs of the same heat range.

WORN

Symptoms: Rounded electrodes with a small amount of a deposit on the firing end. Normal Color. Causes hard starting in damp or cold weather and poor fuel economy

Recommendations: Plugs have been left in the engine too long. Replace with new plugs of the same heat range. Follow the recommended maintenance schedule.
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