How to check spark plugs

Have suspicious spark plug symptoms? Know what signs and conditions to look for in your spark plugs.

Reading Spark Plugs Color

How to Change Spark Plugs - AutoZone

toyota - How to check if spark plugs are firing? Coil-on plugs

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Check a Spark Plug the Fast & Easy Way

DIY Spark Plug Inspection (9 Common Problems to Look For)