![]() In most lawnmowers, the crankcase breather is located just above the valves. Not all lawnmowers have this PCV tubing, but for those that do, if it becomes loose or broken, it can cause oil leakage into the combustion chamber, causing oil fouling of the spark plugs. The PCV is the valve that allows exhaust from the fuel out of the combustion chamber and into a valve that releases it in the crankcase. Remove clogs or replace the pump if it is damaged.Ĭause: Problems with the Crankcase Breather (PCV) Look for cracks in the housing or other damage and blockage. Turn the fuel valve to the ‘off’ position or clamp the line to the fuel pump and remove the fuel pump.If there are any clogs, clean the fuel line out. Turn the fuel valve to the ‘off’ position to remove the fuel line and inspect it for clogs.The steps for checking for and fixing a clogged fuel injector on your lawnmower are: Anything out of the normal range can create a carbon build-up on the spark plugs. Solution:įuel injection levels affect the fuel and oxygen mixture. They may require opening up the engine or using solutions that dissolve clogs that can’t be seen on the surface. This creates an oxygen-rich mixture that will not burn hot enough and will leave fuel and carbon residue on the spark plugs and other essential components in the lawnmower engine.įuel injectors are more specialized components of the engine than air intake valves. (Source: Gold Eagle )Īnother reason that spark plugs foul is that the fuel injector is clogged. The screws that hold the carburetor connections can also be jostled free by the engine’s vibrations and may need to be tightened.These connections can become sticky and blocked and may need to be cleaned out. The connection of the carburetor is at the throttle and choke plates.To fix this, either brush away the debris or use a screwdriver to remove the casing that the air intake screen filter is held in and remove as much of the blockage as you can. On top of the carburetor is the air filter intake, which can become clogged with grass clippings and dust.To check for and fix a clogged air intake on your lawnmower, do the following: When the blockage is removed, you should notice a louder, more efficient sounding engine with more power. When the air intake is blocked, you should notice considerably less power from the engine. It can be checked by looking at the air filter and the connections. The air intake on the engine of your lawnmower is the carburetor. Since this is the case, the incorrect mixture of fuel and oxygen in your lawnmower could be because of a blockage in the air intake, creating a fuel-rich mixture that could cause smoke and increased carbon build-up on spark plugs. (Source: Auto Success Online )Īll internal combustion engines are air-breathing and deal with an atmospheric pressure of air being forced into the mixture. The most common reason for the fuel combustion system to cause carbon build-up on the spark plug is a failed mixture of fuel and oxygen. If the spark plug is fouling because of a carbon build-up, the reason is likely due to the combustion system of the lawn mower’s engine. You must diagnose the problem and fix it before installing any new spark plugs.īelow are the most common reasons that can cause this, as well as their solutions. What Causes a Lawnmower Spark Plug to Keep Fouling?Ī spark plug that fouls constantly could mean that there are more severe issues with the engine of your lawnmower. Read on to find out more about the most common reason why a lawn mower spark plug becomes fouled and how to fix them yourself. Problems with the crankcase breather (PCV)Įven though spark plugs are relatively inexpensive to purchase, they are annoying to keep replacing on your lawnmower.The most common reasons why a lawn mower spark plug fouls are listed below: Luckily, there are specific reasons why a lawn mower spark plug may become fouled and fixes for each of these problems that you can do yourself. If you have a spark plug that fouls after only a few uses, you have an annoying problem that keeps you from getting your job done. The engine of a lawnmower is only as powerful as the components that keep it running.
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