Because dirty (and worn) spark plugs cause several problems – from a faulty combustion process, lousy gas mileage, failing engine power, a flashing check engine light, or expensive repairs at your service center. In other words – all gasoline engines need a clean, functional spark plug! That means your car, chainsaw, lawnmower, power generator, and tractor need trustworthy and clean spark plug wires and a routine maintenance schedule. Whenever our friends ask about the importance of spark plugs, we remind them of all the gas-powered farm tools that need a spark. A spark should jump from the screwdriver to the engine block covering a distance of half an inch. The easiest way to check an ignition coil is to disconnect the spark plug lead from the plug, insert a screwdriver in the socket holding the plastic handle, and crank the engine. How Can You Tell If an Ignition Coil Is Bad? Telltale sounds of a faulty spark plug include inconsistent engine noise due to misfiring cylinders, backfiring, and sudden drops in engine noise when the throttle is applied.Įngine spluttering may occur due to a bad spark plug or faulty fuel injection and ignition timing. (Your combustion chamber will thank you later – especially if you need your engine to work in harsh weather conditions!) What Does It Sound Like If You Have a Bad Spark Plug? The chart is perfect for printing and hanging in your garage. Without second-guessing your spark plug scoring! The spark plug chart shows perfect examples of worn-out spark plugs and spark plug faults that may lead to loss of power, poor fuel economy, a jittery sound, or costly engine repairs. If they appear rounded, replace the spark plug.Īre you trying to figure out if your spark plug is bad? Then check out this spark plug condition chart! It’s our favorite way to check common signs or defective spark plugs. Closely examine the tops of the electrodes.If the problem persists, the spark plug needs replacing. The easiest way to test if a spark plug is faulty is to put it into another cylinder (swap it with its neighbor, so to speak).To remove carbon buildup from a spark plug, use a pneumatic sandblaster kit or a fine wire brush. Faulty or fouled spark plugs will negatively affect throttle response, fuel consumption, and exhaust emissions. These issues may arise due to one or more faulty spark plugs in the engine. If your engine misfires, runs roughly, or suffers power loss under load, it’s probably a spark plug problem.
BAD SPARK PLUG SYMPTOMS PROFESSIONAL
Burn clean with a light-brown color when cool.Īlways use a professional spark plug wrench to prevent stripping the threads in the cylinder head! How Do You Know If You Have a Bad Spark Plug?.Be set to the correct gap using a feeler gauge.Have the reach and heat specifications of the OEM original.To perform at its best, a spark plug should: To tell if a spark plug is bad, remove it from the cylinder head and check the electrodes for carbon buildup, rounded edges, wetness, and an increase in the electrode gap. So, let’s grab that plug socket and troubleshoot these low-tech but vital hotheads!Ĭommon symptoms of a bad spark plug include engine misfiring, reduced power, fuel economy, failure to start, and increased emissions.
BAD SPARK PLUG SYMPTOMS HOW TO
And we can show you how to troubleshoot them, as we have tons of experience troubleshooting them for many gasoline engines. Spark plugs are also easy to replace in most engines. Luckily – spark plugs are easy to remove and give insight into the health of a gasoline engine. The fact is that spark plugs will make or break a gas engine’s ability to power on and function. Spark Plugs! Yes, those simple-looking ceramic things screwed into the head of an engine are an essential part of its ignition and power-delivery systems. Can Bad Spark Plugs Affect Acceleration?Ī Failing Spark Plug Could Be the Culprit!.
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