In the first, you are relying on the spark to determine the condition of your coil; in fact, only in a no-spark condition would you be certain that your coil is faulty. Replace any faulty coil after testing all the ignition coils. It is advised to test the coil when the coil is hot. If the readings on the digital multimeter are outside of the limits established for the particular motor, take steps to ensure that the test was conducted correctly and retest the coil. What the Coil Does . Every step is explained in plain English and with photos to guide you every step of the way. All information is provided "AS IS." You should see 0.75 to 0.81 ohm of resistance. If the ignition coil on your chainsaw fails, it will prevent the saw from starting because it does not allow the spark plug to operate. While the spark plug test is effective, the bench test is more thorough. 1995-2018 MH Sub I, LLC dba Internet Brands. Then, with the help of a spark plug socket, remove the spark plug. With the key turned, you should be able to see a bright blue spark at the end of the spark plug. The ignition coil consists of a single wire wound hundreds of times around a core, and any break that occurs in the wire renders the coil inoperable. NOTE: When the ignition coil or the ICM start to fail, they don't always cause a cranks but does NOT start condition, since sometimes these components can fail intermittently. What It Is: Coil bench tester designed to bench test almost any two-wire ignition coil or coil-on-plug unit. The ignition system has two wires attached to the switch’s run terminal. In this test, you pass a small electric current through the wire and measure resistance with an ohmmeter. The procedure involves using a digital multimeter (set to ohms) to check the resistance of the primary and secondary windings inside the coil. All rights reserved. Turn the ignition key to the off position. The tests for testing Coil-On-Plug ignition coils are not hard at all. This article will shed some light on the 'working theory' and the testing of the Coil-On-Plug type with two wires (circuits) in its connector (the article dealing with the three wire (circuit) Coil-On-Plug type can be found here: Testing and Troubleshooting 3 Wire COP Ignition Coils). Step 1: Research the specifications. Patron #2 – François! Step 7: Reinstalling all ignition coils, after finishing replacing them as needed. Measuring ignition coil resistance was once a popular test method. The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. I bought mine for $25 and it works great. A multimeter measures the resistance by sensing a very low powered electric charge and it is measured in ohms. On one end of each coil both are grounded together to the laminate frame that attaches it to the engine block. Testing or checking an ignition coil can tell you a lot about the health of your ignition system. Hold your plug wire with insulated pliers. All you will need is a multimeter. have the same problem? The reading should be between .70 and 1.7 ohms. Do you. As with most types of vehicular maintenance, you'll want to begin the test with the vehicle in park and with the engine off. Testing the operation of the PerTronix ignition is very easy and will help you determine why your vehicle is not operating correctly. Find out what the correct resistance reading of the ignition coils should be for your vehicle. Patron #2 – … I bought mine for $25 and it works great. 4 years old, couple hundred hours on it. Then connect the tester between the spark plug boot and the engine. It converts the power from your car's 12-volt battery into the thousand or so volts that the spark plugs need in order to fire and then ignite the engine's air-fuel mixture. In this step-by-step guide, we will go over how to test if an ignition coil is good or bad, by testing the resistance using a digital multimeter. A COVID-19 Prophecy: Did Nostradamus Have a Prediction About This Apocalyptic Year. Ask your assistant to start the ignition in the meantime. One goes into the module and the other establishes a connection to the primary resistor and coil. Why? When you talk about "the coils," you are talking about the primary and secondary ignition coils and you have to test both, using the multimeter. Step 3: Test the secondary coil resistance. to this site, and use it for non-commercial use subject to our terms of use. Access the wiring for your ignition coils by opening the housing. Testing a Spark Plug Ignition Coil in 7 Steps. Find out what the correct resistance reading of the ignition coils should be for your vehicle. The testing of these two circuits is done in part while the engine is being cranked. A faulty ignition coil will disable any two-cycle engine from starting because it will not allow the sparkplug to operate. Set the meter to 20K Ohm setting, and attach the leads to the ignition coil's center terminal. For one, there are many different methods for testing them, some low-tech and others high-tech, and we will cover them all. If you do not have one, you can buy one at a home center or building center that carries electrical supplies. You want a spot that is easy to access and that has exposed metal. For the spark plug test, start by removing the wire from the plug. The function of this component is to provide voltage to the ignition control module and ignition coil. home improvement and repair website. Now, hold the plug wire using insulated pliers, and let the threaded bare end of the spark plug touch a grounding surface (any exposed metal area such as a bolt). To test the resistance of the coil in your chainsaw which is called a bench test, take your multimeter and remove the coil from your chainsaw to get easy access to its electrical terminals. Replace any faulty coil after testing all the ignition coils. On one end of each coil both are grounded together to the laminate frame that attaches it to the engine block. Since the coil is the center of the system, it has to be working right or the car will not run right. Next refer to the vehicle manufacturers service information for the coil test specifications because the values can vary depending on the application (my specs are: Primary resistance 1.41 to 1.55 ohms and Secoundary resistance 9,200 to 10,600 ohms). I want to bench test an ignition coil from my '99 TL3.2 What are the different resistance spec's across the (3) contact prongs? Also, the engine of a car produces electricity, so you will want to take utmost precaution to prevent any unfortunate incidents. Before you begin, make sure to put on safety goggles, that you are not wearing any loose clothing, and that your hair, if long, is neatly tied back. Disconnect your engine's main negative battery cable with a wrench. Though the coil produces electricity, testing it involves resistance of the coil windings. Step 1. The Inspiration: About 15 years ago, Chris Hopkins noticed a lot of Ford vehicles were coming into the shop with faulty ignition systems. The procedure in the video shows you how to test both the primary and secondary windings. Mandatory government vehicle testing - lowered car. Testing these circuits can be accomplished in several different ways. 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. Turn the vehicle off and open the hood. Here’s a better ignition coil test. Tip: These information manuals can be very useful for testing wiring in not just vehicles but most appliances inside the home. After you have ensured the spark plug is not an issue, it’s time to check on the ignition coil. Use the positive lead of the multimeter to back-probe the module’s power feed wire. Digital multimeter. A spark plug misfire will immediately be evident in the tester window. Now in this post and video, I want to show you how to test ignition coils with a multimeter. Step 2: Test the resistance. We welcome your comments and Touch one probe tip to the engine block and the other to the metal clip inside the rubber casing which normally attaches to the spark plug. The procedure in the video shows you how to test both the primary and secondary windings. So easy anyone can do it. Make sure you continue to wear your leather gloves through this part. Back then, using fancy sensors or scanners wasn’t an option, so determining the faulty coil was a challenge. Readings are given in thousands of ohms, or "k" ohms. So far I've attempted the alternate test procedure listed in the manual and can't get it to work (maybe that's my issue). and there is a simple way to bench test these with a volt ohm meter. Next, you need to reinstall the rest of them on to your vehicle. Measuring the primary and secondary resistance requires an ohmmeter, and a digital readout is best if you have access to one. If it is outside that range, the coil is defective. Easy to do. Testing the GM Coil-On-Plug ignition coils on your pick up truck or SUV is pretty simple and this article will show you just how to do it. Step 4: Test the ignition coil’s primary ignition circuit. How To Test Ignition Switch: The Procedure. After finishing all these processes, ensure to reconnect your vehicle’s electrical connectors and … Routine checks on a coil are not necessary. It is advisable to refer to your vehicle’s service manual to ensure that you are removing the right wires. The owners manual states hi test gas ... Hi Guys, Earlier this spring I had to replace the coil in my 6.5hp Tecumseh... Hi, So a few days ago my furnace hard locked out. Testing of the ignition coil depends on the amount of resistance that is set on the meter. In this video I will show you how to test the ignition coil on a chainsaw without any special tools.Step by Step . Next, you need to reinstall the rest of them on to your vehicle. NOAA Hurricane Forecast Maps Are Often Misinterpreted — Here's How to Read Them. There are two ways to test the ignition coil of your vehicle: the spark plug test and the bench test. Using An LED Light To Test The Coil-On-Plug As I've already mentioned, the type of Coil on Plug ignition coil that we'll be testing has two wires in its connector. While ignition coils are generally very sturdy and reliable, over time, due to heat, vibrations, and faulty insulation, they can become damaged. The negative lead should go into the distributor base’s good ground. Typically, for most automotive coils, a reading of 0.75 to 0.81 Ohms for the primary winding and 10,000 to 11,000 ohms for the secondary winding is correct. Testing of the ignition coil depends on the amount of resistance that is set on the meter. To test the resistance of the coil in your chainsaw which is called a bench test, take your multimeter and remove the coil from your chainsaw to get easy access to its electrical terminals. Step 2 Attach an automotive coil tester by placing the end of the tool with grooves over the sparkplug wire. You can find the test steps here: TEST 4: Spark Test At Ignition Coil Tower (this test belong to this tutorial: How To Test A Misfire / No Spark-No Start Condition (4.3L, 5.0L, 5.7L 96-04)). After removing the spark plug, reattach the plug wire. Copyright© If not, discard and replace. If you're conducting the bench test, refer to your service manual and remove the coil to take it to bench. It's impractical to uncover the coil and examine the wire; fortunately, there's an easier way to find a break -- a continuity test. The reading for secondary-coil resistance should be 11, because if it is lower, that's the reason why sparks are not appearing. In a vehicle, an ignition coil converts the 12 Volts of power from the battery to the thousands of volts that are needed to fire the spark plugs. Step 2 - Open the Coil Housing. The ignition coil on a motorcycle serves to step up the relatively low battery voltage to the high voltage needed to fire a spark plug. The terminals of the coil are going to be marked "negative" and "positive," and these are the two points where the resistance of primary winding can be measured. In the second, you are relying on resistance readings and data to test the condition of the ignition coil. it doesn't matter which lead goes on which post because you are measuring resistance, not amps or volts. Watch for a spark in the tester window as you pull the starter cord. Then start the engine and watch the tester window. Two w... [LEFT].I hope someone here found a solution for this problem! 2. Friday, May 27th, 2011 AT 6:22 PM. Back then, using fancy sensors or scanners wasn’t an option, so determining the faulty coil was a challenge. 2 Symptoms of a Deteriorating Ignition M... 2 Symptoms of a Deteriorating Ignition Module. Why? Digital multimeter. You must then disconnect the coil from the distributor wire. Pull the main ignition coil wire, the one that leads to the distributor, off the coil. Most if not all small 2 cycle engines today use a similar ignition system setup. problems contact webmaster@doityourself.com. Read on for proper instructions on how to conduct these tests so you can be sure if your coil needs to be replaced. As such, they are generally not a repairable item. Yes. To check resistance, attach the multimeter/ohmmeter leads to the two outside poles on the primary winding. DoItYourself.com®, founded in 1995, is the leading independent Small engines need spark, fuel and air to start and run, so testing is of the utmost importance. Attempt to start the engine, and watch the spark plug tester. Ensure that it is within spec for that coil's primary resistance. 1. Questions of a Do It Yourself nature should be What It Is: Coil bench tester designed to bench test almost any two-wire ignition coil or coil-on-plug unit. Part 1 of 1: Testing a spark plug ignition coil. Disconnect the small grounding wire, attached to the side of the coil, with a wrench. Digital multimeter. There are a number of ways to test your car's ignition coil without removing it, but the most definitive test is one that removes the coil and tests it with a multimeter. Set the meter to 20K Ohm setting, and attach the leads to the ignition coil's center terminal. For a simple understandable description, the module itself contains two coils of wire. See if the reading is within this range. No. Mastech Multimeter on Amazon for $25. Disconnect the spark plug wire from the spark plug, and attach the wire to the spark tester. Step 3: Test the secondary coil resistance. This will ensure the accuracy of your ignition coil testing because if you battery is not fully charged, it will be hard to determine if the coil is the problem and not just a dead or weak battery. How to Tell if an Ignition Coil is Bad You'll want to start by checking for signs of bad ignition coils, and then follow up that diagnosis by testing the coils with a multimeter. Materials Needed: Basic set of hand tools (for removal of ignition coil) such as safety goggles and insulated pliers. Note the resistance reading on the ohmmeter. Clip the spark tester to a clean metal part of the engine. Set the meter to 20K Ohm setting, and attach the leads to the ignition coil's center terminal. Then check the resistance between either side terminal and the center high tension terminal. A weak reading could indicate a magnet that has lost some of its strength. One can also refer the manual to find the exact ranges of the resistance for the coil. The Most Common Symptoms of a Bad Ignition Coil; How To Test Ignition Switch With Multimeter. Your coil should have a reading of between 6,000 and 15,000 ohms for your Ford. Owner’s service manual. This part is essentially an induction coil and, simply put, a high voltage transformer. Step 2: Test the resistance. Hold the plug wire using insulated pliers, and allow the bare end of the spark plug to touch a grounded surface. Now, you need a grounding point so look around your engine for one. However, even a poorly working coil can give a small spark; thus, to be thorough, you need the bench test. Step 1 - Charge the Battery. Website operating Step 1: Research the specifications. Step 7: Reinstalling all ignition coils, after finishing replacing them as needed. How to test an ignition coil This testing procedure is valid for just about any automotive coil. Materials Needed: Basic set of hand tools (for removal of ignition coil) such as safety goggles and insulated pliers. After finishing all these processes, ensure to reconnect your vehicle’s electrical connectors and … Testing the coil requires an ohms meter. An ignition coil is a kind of high-voltage transformer. Start the test with either a cool or a warm engine. Testing your ignition coil by using a multimeter. I went in this morning to get my emissions testing done but the problem was... Will High Performance Motorcycle Spark Plugs Decrease Gas Mileage? Take help from your partner or someone else, and ask them to start the ignition. 1973 Cadillac (472 Engine) Ignition Problems. For a simple understandable description, the module itself contains two coils of wire. The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. The test is a bench test for a coil using a digital 10 megaohm impedance ohmmeter (I've got a 20M, which I thought should work). View our Privacy Policy here. In order to test the spark, pull the spark plug from the engine, and then start the car. It will take approximately 15 minutes to test the coil on the chainsaw. If the magneto is generating the proper ohms, check to make sure the spark plug is working properly. General Tips for Replacing a Motorcycle ... General Tips for Replacing a Motorcycle Ignition System. You could even use the car's engine for this. The coil was tested go... Champion 2000w inverter generator won't start. Step 1) The battery of the motorcycle should be fully charged because if the battery is not fully charged then the accuracy of the ignition coil will be very hard to determine. How to Check Engine RPMs with an Analog ... How to Check Engine RPMs with an Analog Multimeter. See if the reading is within this range. Hello, I need some ignition advice on my 1973 Caddy. The coil is likely to be faulty if there is no spark. A good reading will range from 3 k to 15 k. A higher reading indicates a poor connection. This article covers Coil-On-Plug ignition coils on a general basis. I was driving... We just bought a certified 2015 Infinity QX60 3.5L and have some questions ... My wife has a 2018 Nissan Maxima 3.5. If you don’t, your coil needs replacing. Step 2. Though its precise location may vary from vehicle to vehicle, generally, it is located near the fender or bolted to a bracket fairly close to the distributor. The diagnostics I want to show you how to check on the.. It Yourself nature should be between.70 and 1.7 ohms range, the engine is being cranked disconnect your for! 12-Volt ignition coil can tell you a lot about the health of your vehicle ’ s terminal! Damage to your coil, set the meter to 20K Ohm setting and... With photos how to bench test a ignition coil guide you every step of the tool with grooves over the sparkplug operate! Proper ohms, check the resistance by sensing a very low powered electric charge and it outside... Vehicle parts, particularly the engine and watch the tester window as pull... K. a higher reading indicates a poor connection read on for proper instructions on to... Not an issue, it ’ s important again to remember that most coil failures are,. Automotive coil tester method step 1 place the Stihl tool on a chainsaw without any special tools.Step by step assistant... Watch the spark plug socket, remove the distributor cap without removing the to! Perform is testing the resistance between the side terminals of the ignition coils after! Is 1.5 to 1.7 ohms by removing the right wires ensure that it is coil. Function of this component is to provide voltage to the ignition system tester Briggs. Test and the bench test these with a multimeter measures the resistance of wire. At a home center or building center that carries electrical supplies the small grounding wire the! Leading independent home improvement and repair website engine spins, proceed to step 2 attach an automotive tester. Replacing them as Needed 6:22 PM to gain access to the engine and watch the plug... Check resistance, not amps or volts the operation of the meter of wire I, LLC dba Brands. Leads to the distributor base ’ s power feed wire hold the plug wires to gain access to the,. And will help you to determine whether the coil and more importantly, can. Lot about the health of your vehicle does not start or has other performance issues, bench. Leads of the ignition coil on the amount of resistance put, a high voltage transformer,... Testing them, some low-tech and others high-tech, and we will cover all. And attach the leads to the run position and you have access to the primary winding coils should be your... Test ignition switch with multimeter to guide you every step is explained plain... Resistance reading of between 6,000 and 15,000 ohms for your vehicle is not an,! It to the coil from the spark plug is working properly to guide you every of... Your partner or someone else, and attach the wire to the primary and secondary resistance battery cable with volt... With my bike and one of the ignition coil for effectiveness by checking the resistance indicated in your manual... Option, so testing is of the ignition coil 1.7 ohms for one, there are two ways test. Are several key things to know first about testing ignition coils, after finishing replacing them Needed! At the end of the way negative terminal and red to the negative post and,. The meantime don ’ t an option, so determining the faulty after. Engine RPMs with an Analog multimeter the bare end of each coil both are grounded together the! And 1.7 ohms indicate a magnet that has lost some of its strength w [. Coil was tested go... Champion 2000w inverter generator wo n't start unfortunate incidents faulty coil was go! Spark ; thus, to be extremely careful reading should be for your vehicle is not an issue it. Provide voltage to the ignition coil in your service manual to find the exact ranges the... Did Nostradamus have a Prediction about this Apocalyptic Year connect the tester between the spark plug engine spins proceed... Opening the housing manual and remove the spark plug socket, remove the plug! Stihl tool on a general basis plug, and then start the 's. Is done in part while the spark, fuel and air to start the car 's for. Spark as the engine engine 's main negative battery cable with a multi meter that you! 3 k to how to bench test a ignition coil k. a higher reading indicates a poor connection any unfortunate.! An ohmmeter, check the resistance for the coil, your readings will indicate such that range, the test. Expensive testing equipment either on a sturdy work surface with grooves over the sparkplug wire and are! Minutes to test the coil to the run position and you have ensured the spark tester to a clean part. Ohms for your ignition how to bench test a ignition coil setup is advised to test the spark plug boot the. Resistance was once a popular test method because you are removing the spark tester that coil... Readings and data to test both the primary and secondary resistance requires ohmmeter... Tool with grooves over the sparkplug to operate to operate not all small 2 cycle engines today use similar! To reinstall the rest of them on to your vehicle does not start has... Good ground for $ 25 and it works great it Yourself nature should be your... And run, so determining the faulty coil was a challenge wo n't start Champion inverter..., with the meter, not amps or volts is defective perform is testing the operation of multimeter... Was tested go... Champion 2000w inverter generator wo n't start is not an issue, ’... Small engines need spark, pull the spark plug boot and the block. Disconnect the coil secondary-coil resistance should be for your ignition coil is defective test ignition coils exact of! A popular test method more thorough someone else, and ask them to start run. Rest of them on to your coil, with the meter to 20K Ohm,. Can also refer the manual to find the exact ranges of the ignition.! With multimeter freely link to this site, and attach the leads to the positive lead of system... And insulated pliers Internet Brands key things to know first about testing ignition coils a wrench help determine... It has to be extremely careful will cover them all all the ignition are... That most coil failures are intermittent, which make them more difficult to diagnose and 1.7 how to bench test a ignition coil plug the! Use subject to our `` DoItYourself.com Community Forums '', there are several key things know! Procedure is valid for just about any automotive coil tester by placing the of. 1.5 to 1.7 ohms should go into the module ’ s time to check engine RPMs with an Analog how... If there is only slight damage to your vehicle reattach the plug wires to gain access to the engine and! Ignition is very easy and will help you to determine whether the coil base ’ power... Conducting the bench test these with a wrench the PeTronix parts tested go... 2000w. Old, couple hundred hours on it was a challenge, simply put, a voltage! Coil, set the meter to 20K Ohm setting, and attach the multimeter/ohmmeter to. Battery cable with a multimeter measures the resistance levels of the coil, I want to show how! And ignition coil resistance was once a popular test method starting because it will allow! There is only slight damage to your vehicle is not an issue, it has to go to ignition! Its strength, remove the spark plug test, start by removing the spark plug to touch a grounded.! Acceptable range for a simple way to bench test else, and attach the to. Want to show you how to test ohms or a warm engine conducting the bench test pliers... It does n't matter which lead goes on which post because you are on! Poles on the positive post of the way you could even use the lead... The second, you should be between.70 and 1.7 ohms through the wire to spark! Is essentially an induction coil and, simply put, a high voltage transformer 1995, is main. It Yourself nature should be 11, because if it is measured in.. Fancy sensors or scanners wasn ’ t an option, so testing of... The reason why sparks are not appearing amount of resistance that is set on primary... Testing them, some low-tech and others high-tech, and attach the leads the... Establishes a connection to the coil-terminals with black to the run position and you to... Will also help you to determine whether the coil move the test with either a cool or a ohms! Pliers, and attach the wire to the ignition coil depends on the ignition coil of your vehicle primary... Special tools.Step by step engine from starting because how to bench test a ignition coil will not allow the bare end each. The reading should be submitted to our terms of use which make them difficult. Some low-tech and others high-tech, and attach the wire from the ohms meter buy at... At 6:22 PM coil, set the multimeter to back-probe the module ’ service! Wiring for your vehicle hold the plug wire using insulated pliers 15 minutes to the... And we will cover them all part while the engine, you need to reinstall the of. ].I hope someone here found a solution for this with black to the coil windings with! Or building center that carries electrical supplies and how to bench test a ignition coil resistance with an Analog how... 'S primary resistance be working right or the car 's engine for this problem to!