Spark Plugs and Ignition Coils

Newer cars use spark plugs that are meant to last longer than used in previous models. It may interest you to know that as your spark plugs wear the voltage requirement for efficient ignition increases and in return causes the ignition coils to work harder and harder. This increases the likelihood of ignition coil failure. For example, In 1999 Volvo went to Direct ignition coils, while spark plugs were still changed out every 30K to 60K. Those Ignition coils rarely, if ever, failed. Same Ignition system as used today, the cars are going 75K and higher without changing spark plugs and guess what, Ignition coils are failing more than ever. A typical Spark plug can retail $15 to $25 depending on manufacturer, and ignition coils can range from $60 to $90 each. So you have to ask yourself, is it worth it to not replace your spark plugs more often?

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