How to Test Your Spark Plugs

In this video we show the correct way to test of your spark plug is functional using a multimeter.

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0:00 - Overview of Spark Plugs
1:07 - Testing the Spark Plugs
2:28 - Interpreting the Test Results
3:27 - Conclusion

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[clintonhays]

You said above 5 but yours is 4.75. Mines reading 4.11 so is it bad if it's below 5?