![]() Place one of the multimeter leads on the metal end from which you detached the coil, which is usually the thinner part of the spark plug. ![]() Polarity does not matter in resistance tests. To test if the multimeter has been properly configured, place both leads on each other and see if you get zero (0) on the meter screen. Given the expected resistance of a Spark plug, this is the most appropriate setting to get accurate results from the multimeter. While doing this, you also make sure the dial is set to the 20k Ohms range. ![]() Once the coil has been detached, you then unscrew the spark plug from the cylinder head using a spanner that fits its measurement.įor the initial resistance test, you turn the multimeter dial to the Ohms setting which is usually represented by the Omega symbol (Ω). With Coil-on-Plug (COP) ignition systems, the coil is mounted directly on the spark plug, so you loosen the bolt holding the coil in place and remove it.įor coil pack systems, you simply pull out the wire that links the plug to the pack. How you disconnect the coil depends on the type of coil system you use. The initial test we will explain requires you to completely detach the spark plug from your engine so you may have access to the parts to be tested.ĭoing this usually needs you to unscrew the spark plug from the cylinder head and then disconnect the ignition coil from it. Interrupt fuel supply to the engine by either taking out the fuse for the fuel pump (with fuel-injected systems) or disconnecting the tube linking the fuel tank to the fuel pump (as seen in carbureted engine systems).įinally, you keep the engine running till the fuel burns out and, to prevent burns, wait for it to cool off before proceeding to the next step. This is because one of our tests requires you to check for an electrical spark from the plug and you don’t want anything to catch up in flames. The very first step you take is to dry out fuel within your engine to rid all its parts of inflammable liquids. There is more to this testing process, as well as other ways to check if a spark plug is working properly or not and we will elaborate on these. A good plug has a resistance between 4,000 to 8,00 Ohms. With the spark plug taken out, set the multimeter to the 20k Ohm range, place a multimeter probe on the metal end that goes to the plug wire, and at the other end of the plug, place the other probe on the tiny rod coming from within it. Once your tools have been compiled, you move to the testing process. To run a comprehensive diagnosis on a spark plug, you need
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