![]() ![]() It should be noted that the rate of appearance and the nature of the sooting depends on the existing faults (if any): There can also be the so-called “wet” and “dry” sooting. Also, the spark plug can turn black only on one side or to the entire diameter. In particular, spark plugs can blacken all together or only by one or two of the set. After all, it depends on the search direction. Possible causes of sootingīefore answering the question of why the spark plugs are black, it is necessary to determine the way they have become black. If there is still no spark in the tester window, the ignition coil may have failed or there may be another problem with the equipment’s electrical system.All these problems can be diagnosed quite easily just by looking at the black spark plugs.If there is now a spark visible in the tester window, the spark plug is likely defective and will need to be replaced.If you do not see a spark, unclip the tester from the spark plug and attach it to a good grounding location like a bolt on the engine valve cover.If a spark jumps across the terminals in the tester window (or the engine starts), the spark plug and ignition coil are working properly.Attempt to start the engine but stand clear of the tester or any other electrical component to avoid a shock.Attach the ignition tester clip to the spark plug and insert the opposite end of the tester into the boot.Remove the ignition coil wire and boot from the spark plug.If you’re uncertain whether the spark plug, the ignition coil, or another part of the engine’s electrical system is at fault, you can use a small engine ignition tester to test the components: Use an ignition tester to test a bad lawn mower spark plug The spark plug itself appears damaged or corroded with carbon build-up or rust.There is a noticeable increase in fuel consumption during normal equipment use.The engine starts, but stalls shortly after.The engine requires repeated attempts to start or the engine won’t start at all.Garden equipment & lawn mower bad spark plug symptoms The spent fuel exits an exhaust port, fresh fuel enters the intake port, and the combustion process is repeated to keep the engine running. When the piston reaches the top of the cylinder, the spark plug ignites the compressed fuel and air mixture, forcing the piston back down. The flywheel has permanent magnets built into it, and as it moves past the ignition coil a magnetic field is created which induces electricity, allowing the ignition coil to send a high-voltage pulse to the spark plug. As the piston travels downward, it draws the fuel and air into the engine’s combustion chamber. When the engine’s starter rope is pulled, the starter engages a drive cup on a flywheel and rotates a crankshaft which moves a piston up and down within the engine cylinder. The ignition process relies on a suitable balance of fuel and air being drawn through the carburetor into the engine, a properly operating ignition coil, and a functioning spark plug. All gas-powered lawn mowers and snowblowers, along with hand-held products like chainsaws, string trimmers, and leaf blowers, use a spark plug to ignite a mixture of fuel and air to start and run the equipment’s engine. If you’re wondering how to check power equipment spark plugs, first you need to know how they work. This step-by-step guide will teach you how to tell if a lawn mower spark plug is bad along with tips for testing other garden equipment. ![]() Fortunately, the spark plug is one of the easiest engine components to replace. ![]() If the engine on your lawn and garden equipment won’t start, or it runs poorly, chances are the spark plug is worn out. Due to carbon build-up and a weakened electrode, a small engine spark plug will degrade over time. ![]()
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