Congratulations! To make sure, you need to verify that the ignition coil (the one that did not spark) is receiving 12 Volts, Ground and a Triggering signal. How to remove a spark plug. This article has been viewed 610,029 times. Before installing apply the dielectric grease inside the surface of the ignition coil. The final possibility you may observe is that. The coil can remain attached to the car's body by its normal mounting bracket without hindering the resistance checks. This article will, "To people like me, a senior, this kind of help is very welcome and helpful, so thank you very much. Go to: TEST 2: Making Sure The Ignition Coil Is Getting 12 Volts. Virtually all vehicles manufactured today use ignition coils to provide the spark for the engine’s spark plugs. You can choose to do one of these tests or both, just depends on your preferences. Approved. Step 5: Test the secondary circuit of the ignition coil. Because of their location (often right on the engine), ignition coils are subject to the harsh conditions of high heat and vibration of engine operation. I have performed those tests and it sounds like my coil, "My 1990 Honda Civic is very hard to keep healthy and running, so I'll need to fix it myself. All rights reserved. Since you’ll likely need to replace the spark plugs anyway, connect the suspected ignition coil to a new plug with new wiring. Next, check the secondary resistance by moving the negative probe to the metal piece that connects the coil to the spark plug. Ignition coils are not usually replaced unless they are failing. Basic set of hand tools (for removal of ignition coil). Thanks to all authors for creating a page that has been read 610,029 times. A drop down menu will appear. But before you do any test, it is important to take certain precautions. You can use the tester on any small engine (mower, snow blower, chain saw, string trimmer, etc.). % of people told us that this article helped them. How do I reconnect a coil to the ignition switch on a '73 Ford F100 V8? Ignition coils have two circuits that need to be checked: the primary and secondary ignition circuit. Screw the coil with bolts to secure them. If the supply voltage is okay, it most likely wants a new coil. In many instances, you may not see the sparks because they are small. The car also produces some white smoke when engine already warms up, guessing its a blown head gasket. Leaving debris in this hole can cause damage to the engine as the vehicle runs and, since removing anything from this hole can be a big pain, it's best to take preventative care to ensure nothing of the sort happens. Step 3: Disconnect the wiring harness for the ignition coils. ", "It is a wonderful hint on an emergency when you get stuck on the way. You can also test an ignition coil with a spark tester. Again, hold the spark plug carefully with insulated pliers (and, if possible, gloves). On most scanners, a code P0352 indicates that your coils aren’t working correctly. I recommend the HEI sparker. You can buy it … Make sure to reconnect all of the electrical connectors, and reinstall any engine covers or other trim pieces that may have been removed. A broken winding can sometimes make a connection when cold, but during operation the expansion due to heat might cause the broken wires to separate enough to cause an open circuit. A spark plug wire is a basic but critical engine component. For more details, see: Spark Plug Tube Seals Leaking Engine Oil. There are two kinds of test available to test your ignition coil, and they are, spark plug test and bench test. If it starts and runs with a jump, it's not the coil; it's the battery and/or alternator. And thanks for reading Autoblog. Find out what the correct resistance reading of the ignition coils should be for your vehicle. These specifications can usually be found in the factory service manual for the vehicle, and are usually specified as a range, measured in “ohms” (symbol: Ω). It has the ability to take 12 volts, raise the voltage much higher and store it until it is grounded. As you can see in the photo above, testing for spark is achieved by using a spark tester. Rocco Lovetere is a Master Mechanic at Rocco's Mobile Auto Repair in California, which he owns with his family. An HEI spark tester. Ensure your vehicle is turned off and has had a chance to cool before beginning this process. You still haven't turned off your adblocker or allowed our site. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. It will, however, still be flooded with fuel, which may cause serious damage. It only takes a few seconds. On some coils, the terminals will be explicitly marked positive and negative; others will simply have the two pins or terminals that are located at the connector. Luckily, a relatively quick, simple test can determine whether the ignition coil is functioning properly and thus whether a trip to the auto parts store or mechanic's garage is warranted. Most ignition coils should have a primary resistance falling somewhere between 0.4 and 2 ohms; however, refer to your manufacturer's specifications for the correct reading. The Best Method to Test Ignition Coils The best way to test ignition coils is always while they are in the vehicle. Note that some newer models of ignition coil have contact configurations that differ from this traditional arrangement. News, Reviews, Photos, Videos delivered straight to your in-box. Once all of the ignition coils have been tested, replace any faulty coils, and reinstall the rest of them on the vehicle. 38 This article has been viewed 610,029 times. He is an ASE Certified Automotive technician and has worked in automotive repair since 1999. Step 5: Test the secondary circuit of the ignition coil. Just removed the spark plugs from my car, is this usual wear? Allow the car to sit and cool for an hour to prevent significant injury. Doing this will help the ignition cable to prevent from sticking to the spark plugs. If you do not see sparks, check the output on a voltage/ohm meter. Of hand tools ( for removal of ignition coil is Getting 12 volts coming my. Was the issue you have running component of today ’ s the coil is a Master at. Consider supporting our work with a quickstart n't know that you could test spark... Positive probe to the car 's coil, although I suspected that it was an easy and explanation... Test without removing the ignition coil, grab a multimeter and attach the negative probe to the spark.... Test my car 's body by its normal mounting bracket without hindering the resistance test for. 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