When the mower runs, raw gasoline is produced because a bad spark plug prevents the fuel from being burned properly. The odor of your mower is another indicator that it is not burning and consuming fuel efficiently. This makes the mower less fuel-efficient, raising the fuel used. A bad spark plug causes inefficient ignition and improper fuel combustion. (Read Spark Plug Socket Size Guide)Ī bad spark plug could cause your lawnmower to use more fuel than usual to complete the same job. You get this from unburned oil and fuel pumped into the combustion chamber or seeps past the piston rings, and the electrodes can’t create sparks. Another reason you can have a lawn mower bad spark plug isn’t the gap is incorrect it is the carbon buildup on the electrodes. The problem can be worse on a riding mower as you go about lawn care, you may be stranded, and a lawn tractor can’t be pushed. This is because heat expands metals, which widens the space between the two electrodes and reduces the intensity of the ignition spark. The difficulty of starting the engine increases after each attempt as the engine warms up. The engine will shut off or stop mowing because the spark plug is not functioning correctly, and you’ll find the engine sputtering before it dies. Poor Performance:Įven if the engine starts with a bad spark plug, it can take many attempts it won’t be able to continue running for long. The mixture floods the engine as it enters the cylinder, and only a small portion ignites. The spark produced by a malfunctioning spark plug does not ignite the air-fuel mixture from the carburetor via the fuel tank. Knowing what a spark plug does helps to make the explanation of this symptom fairly simple. Similarly, you won’t be able to start a lawn tractor’s engine with just one turn of the key. It will take several pulls on the starter rope when using a push mower before the engine turns on. A damaged spark plug prevents a bad engine start. This is the most common symptom of a bad spark plug. You know the major symptoms now let’s get into their details so that judging becomes more comfortable for you. How to Tell If a Lawnmower Spark Plug is Bad The worst-case scenario is that your engine might not even turn on. There will be no ignition or improper ignition if the spark plug cannot perform its job properly, which can cause a variety of issues. The spark ignites the fuel and air mixture inside the cylinder head. The spark plug in a lawnmower’s engine does the same job as in a car engine.Ī spark plug is an electrical device that creates a spark as the magneto or the ignition coil delivers a high voltage to the central electrode. (Learn How Long Does Ethanol Free Gas Last)Ī spark plug is an essential component of a gasoline-powered engine despite its diminutive size. ![]() By the end, you’ll know all the reasons why your spark plugs are bad and whether you need to change spark plugs, or it just needs cleaning, or you need a spark plug gauge to test the spark plug gap. Our guide will focus on a spark plug on a lawn mower. Spark plugs are required for a gasoline-riding lawnmower, chainsaws, or other gasoline-powered devices or vehicles to ignite fuel in the combustion chamber to function properly. The air-fuel mixture in the cylinder is ignited by a spark created to flow through the tiny gap between the two electrodes. Bad spark plugs are a likely reason your engine is having trouble starting.Ī center electrode and a side-firing electrode are the two electrodes on a spark plug. ![]() But there is frequently a simple solution if you know the cause of the issue. It can ruin your day when you try to mow your lawn, but your mower is difficult or won’t start at all.
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