Tip: For more help on adjusting your carburetor, you can read our article, “ How to Adjust Your Carburetor.”.Then no more soot or carbon deposits should get on the insulator nose of any of the spark plugs. Simply readjust the carburetor to achieve a full burn or have the problem diagnosed for you. When you first begin to examine a spark plug, check for any black soot on the insulator or even the central electrode.Īny soot or carbon build up indicates the engine is running rich on fuel. If you choose to put old spark plugs back in, they will need to go back into their respective places. Tip: Remove and read one spark plug before moving on to the next, as having too many out of the engine at once can create confusion later on. Sometimes a plug will bind in the cylinder head if the engine is too warm during removal. Your spark plugs could still be extremely hot, so be sure to leave ample cooling time. Warning: If you were running your car prior to spark plug inspection, let your engine fully cool. Examine your spark plugs, comparing them to the diagram above, to familiarize yourself with the plug’s condition and the engine performance. Refer to your vehicle service manual to determine the location of your spark plugs, how many there are, as well as instructions on pulling them out.ĭepending on your vehicle, you may need a ratchet socket drive wrench and an extension bar to remove your spark plugs. Part 1 of 1: Inspecting the condition of your spark plugs Follow the steps below to learn how to read your car’s spark plug. If the tip of the plug is any other color or condition, it indicates an issue with either the engine, the fuel system, or the ignition. Most often, a light tan color around the tip of the spark plug indicates a healthy and well performing engine. In short, the reading of a spark plug involves evaluating the condition and color of the tip of the spark plug. Learning how to read a spark plug is quick and easy, and can equip you with the skills to determine when to change out your spark plugs for optimal performance. Spark plugs can provide valuable information about your vehicle’s performance and can predict potential problems.
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