If you’re having an ignition coil issue, you’ll want to test your coils to determine which one is having problems. Using a spark tester is the best way to diagnose an ignition coil. Get alerts, check your status, or report an outage online. The negative(black) probe should then be placed against the metal that extends out of the second terminal on the ignition coil. After you have ensured the spark plug is not an issue, it’s time to check on the ignition coil. As the magnets pass by the ignition module, they induce an electric current within the ignition module's windings. Return the spark plug to its housing. Video: How To Test The Ignition Coil On A Stihl Gas Trimmer. Replace any faulty coil after testing all the ignition coils. There are many great multimeters on the market and if you’re looking for the best brand, then the Fluke brand is definitely the one to go for. (and I've seen the old style ignition system coils several times test ok using a test meter and ignition coil/Magneto tester and not work correctly on the equipment.) This, in turn, melts the coil’s wire insulation causing the wires to break requiring a new ignition coil. One of the coil’s terminals should be shown leading to the spark plug. Attach an automotive coil tester by placing the end of the tool with grooves over the sparkplug wire. The things you can do with a multimeter is endless and you can find so many different benefits from using it that it’s no doubt one of the best devices to keep around the house. Checking the magneto will help you determine whether it is the source of a Weed Eater malfunction, and it is a simple task that takes only a few minutes to complete. There are many helpful uses of multimeters around your house and while many of these are typically used on your vehicle or in your home, it is also very useful for smaller engines you use including your lawnmower. Remove the flywheel using a wrench and then inspect the coils. If the ignition coil malfunctions, the trimmer will run poorly or not start. Use good judgment when working with high-voltage equipment such as Weed Eaters; you run the risk of shock or serious burns. Your email address will not be published. If you are looking for a good multimeter that’s a bit more affordable, then I would instead suggest the Innova 3340 which is a much better choice for DIY and homeowners. Adjust the spark plug gap to 0.7 millimeters, the industry standard spark plug gap specification. Then start the engine and watch the tester window. If you’ve been using the same spark plug for a while, you may want to pull it out and check for different signs of problems with your lawnmower. Activate the recoil starter of the unit. Often get dirty and worn down over time. When having an issue with your car’s ignition coil, you should test the coil using a multimeter in order to determine which one is experiencing the problem. Get shopping advice from experts, friends and the community! When the magneto malfunctions, the Weed Eater will lose energy or stop running. My coil measured 6.56 k ohms. Monitor the test window of the spark plug tester for a strong blue spark arcing between the two electrodes. The ignition coils are situated on top of the engine beside the flywheel with two ends touching the flywheel rim. I often talk about many of these tasks that you should do yourself at home not only save you time and effort, but also to save you money. Adjust the gap if the spark plug does not feel secure in the housing. I never see where anyone has talked about too much resistance when testing the coil. Therefore, in this article, we shall be focusing on how to check a coil … Step 7: Reinstalling all ignition coils, after finishing replacing them as needed. This video provides step-by-step instructions for replacing the ignition coil on Ryobi and Homelite hedge trimmers. If you have ever tried starting your lawn mower and pulled that cord over and over without any luck, it could mean many different things including a fault with fuel/oil, the induction coil, or the spark plug. Locate the spark plug, and disconnect the spark plug wire. Remove the engine cover which is on the top of your lawn mower. Do not save, do not be greedy and do not be clever in this matter. If no spark appears, eliminate the wire on top of the ignition coil. Now, set your multimeter to test resistance (ohms) by first placing the red lead into the … If the meter is showing 0, your coil is no longer working and you will need to bring it in for repairs. Her nearly 20 years of experience in horticulture informs her work, which has appeared in publications such as Mother Earth News. Craftsman Weedwacker 32cc model 358.795580 I replaced the the ignition coil but still will not crank. To test your weed eater's ignition coil, connect the … In this video I do a few tests to determine the problem with my string trimmer, then s These testers are fairly inexpensive, simple to use and can be bought online or at your local hardware store. Checking the fuel mixture Before starting the engine of the gas spit, check the availability and quality of the fuel mixture. Allow the engine to cool completely before checking the magneto; you run the risk of burns if the internal components are still hot when exposed. If a light flashes inside the tool, there is sufficient spark in the sparkplug, indicating that the ignition coil is working properly. Touch the positive(red) probe to the metal connector inside the spark plug housing. The 0.2 ohm spec is for the kill switch, not the coil primary resistance. Now connect the positive and the negative leads of the multimeter to the positive and the negative terminals of the coil … Turn off the Weed Eater. Small engines are found in lawn mowers, snowblowers, leaf blowers, edgers, pressure washers, generators, and other outdoor power equipment. Proceed to rev the engine to 850 rpm (revolutions per minute). Watch the coil tester when cranking the equipment. They sometimes only partially fail. A completely faulty ignition coil can often keep the vehicle, especially a 4 cylinder vehicle, from running at all. This coil produces and fires off the high voltage charge. Digital multimeter that can measure resistance(ohms) --, Owner’s manual for your Lawnmower (Check manufacturer and model of your Lawnmower). Turn the Weed Eater on. Lay it on flat, dry ground outdoors or in a well-lighted indoor work space. The flywheel has a couple of magnets mounted on it at specific locations. Take your Weed Eater to a repairman certified to work under the limited warranty of Weed Eater brand string trimmers if the spark is very weak or there is no spark; the magneto will need to be replaced. If all the wiring and spark plug check out through testing, replace the entire ignition module. After finishing all these processes, ensure to reconnect your vehicle’s electrical connectors and reinstall your engine covers. I re-read the manual page I looked at (a little too fast apparently) and realized that while its instructing you to measure the resistance across the ignition coil, the purpose of that test is to check the kill switch, not the coil. Look for a removable portion of plastic held on by two to four screws, depending on the Weed Eater model. This video demonstrates how to test both an ignition coil and a spark plug on a small engine. Ignition coils generate electric charge for the spark plug. Watch the coil tester when cranking the equipment. Safe to say if you know you’ve had the same spark plug for the past year in your lawn mower, it’s time to change it. If the spark plug ignition cables are getting faulty, it will have a much higher than normal resistance which causes additional voltage to be generated by the ignition coil which causes excess heat. I saw on youtube that it needed to be set close enough to the flywheel that it almost touches. Testing and replacing the ignition coil on a Stihl FS 80R string trimmer. The coil of your chainsaw has two circuits: primary and secondary. have someone crank the engine and look to see if sparks jump across to the point on the testlight. If you see a spark appear in the tester, you know that the lawnmower is in good condition but the spark plug was faulty and it’s time to replace it. The ignition module houses an electrical coil.
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