![]() ![]() Learn more about quality spark plugs, find your car part, or find where to buy your auto part today. However, continuing to drive with fouled or dirty spark plugs can lead to more serious problems that are more costly to resolve. Most problems that are a result of a bad spark plug are relatively easy to fix. If your vehicle is experiencing any of these issues, a trip to your trusted mechanic is in order. You might also feel the vehicle vibrating. A fouled spark plug causes your engine to sound rough while idling. ![]() So that’s what we’ll test for next.Ĭheck the wiring for signs of damage, or use a DVOM to check continuity when the switch is in the on position.When your spark plugs are performing as they should, your engine sounds smooth and steady. A rubbed through the wire is very possible, especially on machines that create a ton of vibration. If voltage finds a shortcut, it never reaches the plug, so it doesn’t create a spark. That said, chafing or rodent damage to the control wire or plug wire can cause the wiring to ground, and as you know, that will offer the armature the shortcut it’s in search of. So the ignition system is a basic system with few moving parts and little to go wrong. This wire is connected to the On/Off switch. Great!Ī coil control wire is added to offer the voltage a shortcut, which diverts voltage from the plug and shuts the engine down. It must jump the electrode to find ground and, in doing so, creates a spark. The spark plug offers a path to the ground, but because of the gap, it’s not perfect. The voltage is constantly searching for the shortest and easiest path to the ground. The voltage is increased by the armature primary and secondary copper coils and exits via the plug wire in search of ground. In so doing, it excites the copper windings inside the armature. Fitting the wrong plug can cause all sorts of problems. This is a long-winded way of saying plug type is super important. That code indicates a special set of parameters, including its optimal operating temperature. A plug needs to operate at a sufficiently hot temperature so as to burn off contaminants and yet not so hot that it ignites the fuel mixtures prematurely.Īlthough spark plugs all look identical, they are optimized for particular temperatures, and each plug type is coded. Spark plugs have a difficult job a combustion chamber is a pretty hostile environment. If you need video help, check out “Mower spark test video.” Cleaning & Gapping Snow Blower Spark Plug Switch and armature testing and replacement are covered below. As said earlier, armature failure is more likely. A faulty control switch is possible but less likely in any event, it should be eliminated before condemning the armature. If no spark is present, suspect a faulty armature (coil). To nail this successfully, a helper and a new spark plug are advised.Ĥ Check – View the test tool window for spark. Insulated pliers (plastic coated handle).You’ll need a few basic tools they include: In this section, I will show you how I test for spark, both with and without a spark test tool. You can find the test tool I use here on the “ Small engine tools page”. In a test situation, this is exactly what we want. I recommend using a spark test tool the tool does a better job than a spark plug as it stresses the armature, which causes it to work extra hard to fire the tool. Viewing the plug while yanking on the cord can be tricky, and you know if the plug doesn’t ground, it won’t spark. I know you tested the spark plug and found no spark, but it’s worth noting testing for a spark without a test tool is sometimes hit-and-miss, especially if you are testing solo. ![]()
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