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How To Test The Spark Plug


Testing a spark plug is an important part of keeping your vehicle in top running condition. Whether you are a professional mechanic or a do-it-yourselfer, having the right tools and knowledge is essential to ensuring that your spark plugs are working correctly. This guide will provide you with the necessary steps to ensure that your spark plug is in top working condition.

First and foremost, it is important to make sure that your spark plug is the right size for your vehicle. A spark plug that is too small will not be able to generate enough spark, while a spark plug that is too large can cause damage to your vehicle's engine. To determine the correct spark plug size for your vehicle, consult your vehicle's owner's manual.

Once you have determined the correct spark plug size for your vehicle, the next step is to check the spark plug for any signs of damage or wear. Visually inspect the spark plug for any signs of corrosion or buildup. You should also inspect the ceramic boot and electrode for any signs of cracking or damage. If any of these signs are present, the spark plug should be replaced.

The next step is to test the spark plug. To do this, you will need a spark plug tester. This device will allow you to measure the amount of spark produced by the plug. To test the spark plug, attach the spark plug tester to the plug and turn the engine over. If the spark plug is functioning properly, the tester should indicate a strong spark. If the spark is weak or non-existent, the spark plug should be replaced.

Finally, it is important to check the gap in the spark plug. The gap should be checked with a gap gauge and should measure approximately 0.028 inches. If the gap is too wide or too narrow, it can affect the performance of the spark plug. To adjust the gap, use a gap tool to bend the electrode until the correct gap is achieved.

In conclusion, testing a spark plug is an important part of vehicle maintenance. By following these steps, you can ensure that your spark plug is in top working condition. Remember to always consult your vehicle's owner's manual and use the correct tools when testing your spark plug.