Smell of raw gasoline coming out of the tailpipe. This inexpensive spark tester is a MUST have tool to be able to correctly diagnose the Coil-On-Plug ignition coils on your GM vehicle with the info and tests in this article (don't have an HEI spark tester? So if your GM pick up or SUV or van is suffering a misfire condition due to a bad COP ignition coil, this is the article for you. These are fuel, air (compression), and spark. Some older mechanics tend to use the method that involves disconnecting the spark plug wire and holding it against a metal chassis while cracking the engine. A working ignition coil will give a reading of between 2.5 – 5 k ohms. Don't have one? Why? Step 1: Clip one end of the spark tester (service part number 19368) to the ignition cable and the … As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. IMPORTANT: Testing the ignition coil by pulling the ignition coil off of the spark plug while the car is running (to listen for the audible clicking sound the spark makes) is not a good idea. Symptoms of a BAD Ignition Coil. Open the hood to locate the ignition coil. The ignition coils, that sit on top of the valve cover, are the ones that supply the spark and when one or several fail... those cylinders will go ‘dead’. 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008. Rotten egg smell coming out of the tailpipe. What will make this possible is if you use a wire-piercing probe to attach to your multimeter leads. This is due to the unburned gasoline from the misfiring cylinder over loading the catalytic converter. Turn Ignition Switch OFF and repair. The secondary resistance will be in the thousands of ohms. 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. If the coil is intact, the resistance is a measurable number in the order of 2,500 to 5,000 ohms. Remember, all this is happening inside the ignition coil. Low Reference Circuit. If the reading is off, then the coil pack is bad and it needs to be replaced. You do need a few basic tools and these tools won't break the bank. Testing the coil requires an ohms meter. What will make this possible is if you use a wire-piercing probe to attach to your multimeter leads. Tools  |   To find out more about this inexpensive yet accurate spark tester, go here: If you need to buy one, you can buy it here: A scan tool is a great tool to have, but you won't need one to test the ignition coils on your Toyota. Smell of unburned gasoline coming out of the tailpipe. Puedes encontrar este tutorial en Español aquí: Cómo Verificar las Bobinas de Encendido (GM 4.8L, 5.3L, 6.0L) (en: autotecnico-online.com). To test these circuits, it's not necessary to unplug the ignition coil's connector. Ignition coils fail in 2 ways – either complete failure and lack of output, or intermittently, meaning, the coil gets weak, output gets low, or the coil sometimes works and sometimes doesn’t. Test the ignition coil’s primary ignition circuit. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. ", Home  |   You may also experience this in combination with the following: To test the COP ignition coils you do not need an automotive diagnostic scan tool (commonly known as a scanner or scan tool). Check the readings you receive against those given in the service manual. Misfire codes that light up the check engine light (CEL) on your instrument cluster. 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