#Signs of bad spark plugs manual#
You can learn about these problems from the user manual or easily from the internet. Stay well informed about the problems an engine might have if the spark plug is bad. Once you know your spark plug is not in perfect condition, you can either fix it or change it. There are several criteria on which you can judge the health of your spark plug. You can check the spark plug periodically so that you are always aware of your mower’s spark plug health. Checking the Spark Plug:Ī faulty spark plug will give you clear enough symptoms of the problem, but you don’t necessarily need to wait for the signs.
Because of a bad spark plug, the fuel is not burned correctly, and raw gasoline is created as the mower is in operation. This decreases the fuel efficiency of the mower, thereby increasing fuel consumption.Īnother way to judge that your mower is not burning and consuming fuel efficiently is odor. With a bad spark plug, ignition is not efficient, and the fuel is not combusted correctly. If your lawnmower is taking more fuel for the same job than usual, one reason might be a bad spark plug. Other performance-related problems associated with a faulty spark plug may include the engine sputtering, popping, or missing. This is because heat causes expansion in metals, which widens the gap between the two electrodes, and the strength of the ignition spark further decreases. After each try at starting the engine, starting becomes more difficult as the engine is getting warmer. When the engine keeps dying out, it needs to be started again and again. Because the spark plug is not functioning correctly, the engine will die out immediately or stop mowing. Bad Performance:Įven if the engine with a faulty spark plug finally starts after many tries, it will fail to keep running for a normal period.As more mixture enters the cylinder and only a tiny portion gets ignited, the engine gets flooded by the entering mixture. A faulty spark plug generates a spark too weak to ignite the air-fuel mixture coming from the carburetor. Now that you know what a spark plug does, the explanation of this symptom becomes relatively easy. Likewise, if you are using a lawn tractor, a single turn of the key won’t be enough to start the engine. If you are using a push mower, it will take many pulls on the starter rope before the engine starts. An engine with a bad spark plug won’t start normally. Like said before, it is the most common symptom associated with a faulty spark plug. You know the main symptoms now let’s get into their details so that judging becomes more comfortable for you. In the worst case, your engine might not start at all. If the spark plug cannot do its job correctly, there will be no ignition or improper ignition, causing all sorts of problems. Combustion of the air-fuel mixture provides energy for the engine to run. The spark plug is fitted in the engine cylinder head, and the spark ignites the air-fuel mixture. When a high voltage is provided to the central electrode, a high potential difference is created between the two electrodes, which allows a spark of current to flow between the electrodes. The side electrode doesn’t receive voltage from any source and is a ground electrode.
Its central electrode receives a high voltage from the ignition coil or the magneto. Unlike most parts of an engine that perform mechanical roles, a spark plug is an electrical device. The spark plug in a lawnmower’s engine performs the same job as in an automobile engine. Though a spark plug is relatively small in size, it plays a vital role in a gasoline-powered engine.
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