8/9/2023 0 Comments Testing spark plug![]() Over time, carbon deposits can build up on your spark plugs and prevent them from firing properly. This can be caused by an oil leak, an overly rich fuel mixture, or improper valve clearance. If oil begins to build up on your spark plugs, it can cause them to misfire and eventually fail. This can be caused by several things, including running the engine at too high of a temperature, using the wrong type of spark plug for your vehicle, or having a defective spark plug. If your spark plugs become too hot, they can begin to break down and fail. What are the possible causes of a bad spark plug? Also, make sure to check your owner’s manual for the specific resistance range for your vehicle’s spark plugs. Keep in mind that a damaged spark plug can cause engine misfires, so it is important to test and replace them as needed. But once the plug's resistance value exceeds 5000 ohms, the plug should be replaced. ![]() As the plug ages, values below 5000 ohms are acceptable. Note: The resistance value of a good spark plug is between 5 ohms. If the reading is outside of the normal range, then the spark plug is most likely damaged and needs to be replaced.
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