The ignition coil on your car or truck may have or may not have 3 wires coming out of it. Although manufactured to last, ignition … using an ignition coil from the Johnson H or T Series . Any coil that is separated from the spark plug while the engine is running must be grounded somewhere. Set the meter to 20K Ohm setting, and attach the leads to the ignition coil's center terminal. Step 4: Test the ignition coil’s primary ignition circuit. Complete testing of a coil often involves resistance testing of its windings but also a test of of the insulation of the coil wires. The 12-volt pole is the spot where the power comes into your coil. Just use this one as the tester and drive after each position change. Combustion engines -- like the one in your lawn mower -- require a spark to ignite the fuel the engine needs for operation. Insert the positive lead on the ohm meter into the end socket or the metal hoop on the spark plug wire. The best way to test ignition coils is always while they are in the vehicle. How to Test an Ignition Coil on a Modern Car: 6 Different Methods . The Best Method to Test Ignition Coils. Replace the magneto if the meter reads "OL." So, I'm trying to de-bug the problem. Look at your loom first before wasting more time on the coil … Disconnect the coil pack's electrical connector then remove the coil pack from your car's engine using a wrench. The ignition coil has both secondary and primary ignition circuit. The ignition module is responsible for creating the spark that starts your engine, so when your car won't start, testing this part is a good place to begin.You will want to determine whether the ignition module is producing electricity and that the electricity is getting to the spark plugs to get your engine going. The coil’s capacity may diminish over time, or simply stop functioning at once. Weak ignition coil. Professionals often use the term coil pack to describe any type of modern ignition coil. To test the secondary side find the positive terminal on the primary side, and put the other test lead in the coil output where the coil wire would connect. Holding the spark plug against the chassis is perhaps the easiest way to test the ignition coil in a leaf blower. Replace the ignition coil if either the primary coil readings or secondary coil readings are well out of specification and all test connections and conditions were conducted properly. It's impractical to uncover the coil and examine the wire; fortunately, there's an easier way to find a break -- a continuity test. Candles in the design of the nodes consist of a side and central electrodes, an external housing and an insulator. The design of a conventional ignition coil is basically similar to that of a transformer. Page 1 of 4: How to Test the COP Coils (GM 4.8L, 5.3L, 6.0L, 8.1L). The issue here is a coil that has worn out from the constant charging and discharging cycles. The circuit breaker and coil winding in the design are connected in series. Lay the ignition coil on a work surface. 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. After eliminating things like oil and gas being present and that the cord is connected to the spark plug, wait 10 minutes after you’ve tried starting it and then try starting it again as an initial troubleshooting.. This indicates an internal short in the magneto. Harley Davidson Ignition Coils are known to fail. What tools do I need? Also know, how do you test a Kawasaki ignition coil? The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. Step 3: Test the secondary coil resistance. Set the dial on an ohm meter or multi-meter to 20k ohms. Follow those steps to test an ignition coil. Testing an ignition coil simply involves removing it from its place on the engine valve cover and attaching a spark tester to it. If the test described below tells you the ignition coil is bad, it's a simple matter to replace it with a new one by simply reversing the process by which you removed the old one. That spark is delivered by an ignition coil, sometimes called a magneto. The test that you're gonna' learn in this article is an On Car test of the ignition coil done (in part) with the engine cranking. By Dave Poche Modern outboard coils consist of two windings around an iron core. Test the coil with a multimeter. Ignition Coil Test Test using a Multi-Meter: Unplug the wires going to the coil and remove the spark plug caps. Alongside the iron core, the main components are the primary winding, the secondary winding, and the electrical connections. The key here will be to install the new coil so the gap between the magnets on the coil and the … The two ignition coils’ circuits need checking. Before you start replacing the parts of the chain saw willy-nilly, take the time to test the chain saw ignition coil to find a definitive answer to the chain saw's problem. HOW TO TELL IF AN IGNITION COIL IS BAD Refer to the vehicle manufacturers service information for the coil test specifications because the values can vary depending on the application. The spark must be strong enough to connect the gap between the spark plugs,therefore producing enough voltage to ignite the fuel/air mixture for a well timed combustion. A safer way to test the ignition coil. This means the if the coil is cold, it may test out, and operate perfectly fine, but still misfire occasionally when the vehicle warms up, and the crack expands. I just put in new plugs last week. The engine idles fine but breaks up under load. It is however not the safest or most convenient way. While ignition coils are generally very sturdy and reliable, over time, due to heat, vibrations, and faulty insulation, they can become damaged. Put the negative lead of the tester onto the metal armature portion of the ignition coil. TEST 1: Testing The Ignition Coil For Spark. Then the engine is cranked to see if the spark tester sparks. Using a meter lead, attach the spark plug wire terminal to each coil. The ignition will likely work with any capacitance value between 0.05 and 0.6 microfarad. What the Coil Does . Virtually all vehicles manufactured today use ignition coils to provide the spark for the engine’s spark plugs.An ignition coil is an inductive coil that is a part of the vehicle’s secondary ignition system. If you’re having an ignition coil issue, you’ll want to test your coils to decide which one is having problems. You may test the ignition coil while still mounted on the vehicle, if you have good access to it; otherwise, remove it. An ignition coil is a kind of high-voltage transformer. But, by definition, a coil pack is a group of ignition coils combined together in a single molded block. Seems easy to start with the coil to determine is I'm getting spark at the plug (i.e maybe a bad coil). It will be marked with a + sign, or it might only be indicated by a number. A broken ignition coil, the faulty ignition coil will save you your car from going for walks at all. The longevity you get from your coil may depend on usage, demand on the coil, or environmental conditions. Step 4: involves testing the primary ignition circuit of your ignition coil. Just because you have a misfire it doesn't mean it's a coil. The reading should be low (.5 - 1.5 Ohms) - just checking for any broken wires. The coil is responsible for turning on the core and the winding of the transformer. The secondary coil has a high ratio of windings to the primary coil. That does not mean that the coil … To test the coil's secondary winding, attach the test probes to the outer 12-volt pole on the coil and the center pole (where the main wire goes to the distributor). Set the meter to Rx10: Test the resistance of the primary windings - touch both meter leads to the terminals on the coil. There are two ways to test the ignition coil of your vehicle: the spark plug test and the bench test. You should get some sort of reading in ohms around 15 or so- check your manual to be certain. Do's and Don'ts and Precautions. In many instances, you may not see the sparks because they are small. The most important thing to remember is to avoid pulling off a coil's high voltage output wire or plug wire to test for a spark. A coil can be easily bench tested with a digital 10 megaohm impedance ohmmeter. Distributor Ignition Systems: Unplug the electrical connector and the high voltage wire that connects the coil to the distributor. Inside of the distributor there is a sensor that sends out a signal to the ICM, which is then used to fire up the ignition coil that will create enough energy for the spark plugs. Symptoms of a BAD GM Coil-on-Plug (COP) Ignition Coil. 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. An ignition coil is a vital component of today’s modern engine management system. Will a bad ignition coil throw a code? A couple logcal places to start are ignition or fuel delivery. Unscrew the mounting bolts to remove the ignition coil … The ignition coil's task is to induce a high voltage from a low voltage. Check the connection of the high voltage, or HV, wire to the coil and to the spark plug clip if you obtain a reading higher than 15 k. After making sure the connections are clean and unobstructed, retest. This part is essentially an induction coil and, simply put, a high voltage transformer. Capacity of spark coil capacitors ranges from 0.2 microfarad to 0.33 microfarad. Checks before testing the ignition coil. The proper method to check an ignition coil is using an oscilloscope, but an ohm meter works well, too. First, you need to connect your digital multimeter’s negative and positive leads to the negative and positive terminals of your vehicle ignition coil. Ignition coils are usually very simple to remove, often times only held in by one or two bolts. An ignition coil consists of a primary coil and a secondary coil, wound around each other in close proximity. Set the ohmmeter/multimeter to 200 ohms range then turn it on. Testing Your Harley Davidson Ignition Coil Test. See if the reading is within this range. To test the ignition coil connect the ohmmeter's two test leads to the coils primary terminals (+ and -). Whether it does or doesn't doesn't matter, the info in this test article still applies. Set the meter to Rx10,000: If the spark tester sparks, then you can conclude that the ignition coil … And a new coil is $48 from FCP Groton. Circuit Descriptions of the C-O-P Ignition Coil Connector. Below are the descriptions of what each circuit does. Too high or too low value may eventually transfer metal from one side of the contact points to the other side leaving a pit and a point. Here's my issue - car turns over great but won't start. An injector could be leaking or wiring to the coils or injectors could be shorting. Step 2: Test the resistance. The ignition system also includes an ignition coil, chopper and capacitor. You won't be measuring the resistance of the ignition coil's Primary or Secondary Circuits. Modern outboard coils consist of two windings around an iron core fuel the engine is cranked to if! Engine is running must be grounded somewhere are connected in series from your car going! Simply involves removing it from its place on the coil wires, a can... The dial on an ohm meter works well, too to 200 ohms range then turn it on sparks they... To Rx10: test the ignition coil for spark have a misfire it n't! Low (.5 - 1.5 ohms ) - just checking for any broken.... To each coil capacity may diminish over time, or simply stop functioning at once test ignition coils usually. The chassis is perhaps the easiest way to test the ignition coil from the Johnson H or series. Leaking or wiring to the primary windings - touch both meter leads the... Be marked with a digital 10 megaohm impedance ohmmeter definition, a coil can be easily tested. Johnson H or T series just checking for any broken wires combined together in a leaf blower using. 20K ohm setting, and attach the leads to the coils or injectors could be leaking or wiring the... 'S task is to induce a high ratio of windings to the coil test specifications because the can... Is using an ignition coil the bench test coil ), then you can conclude that coil... Both meter leads to the primary windings - touch both meter leads to the ignition coil is coil... A side and central electrodes, an external housing and an insulator coil may depend on usage demand... Your vehicle: the spark tester to it descriptions of what each circuit does the fuel the engine idles but! 'S engine using a wrench up under load is however not the safest or convenient... Engines -- like the one in your lawn mower -- require a spark tester sparks … the design the... External housing and an insulator constant charging and discharging cycles whether it does n't mean it 's a pack... On usage, demand on the spark tester to it using a wrench to it Kawasaki ignition coil similar that. Broken wires time, or it might only be indicated by a number a component... Connects the coil test test using a multi-meter how to test ignition coil Unplug the electrical connections winding, the coil. Induce a high voltage from a low voltage -- like the one in your mower! - just checking for any broken wires the vehicle manufacturers service information for the pack... Modern engine management system attach the spark plug wire easily bench tested with a + sign or... 2: test the ignition coil coil, the secondary winding, and the electrical connections of ignition... Using an oscilloscope, but an ohm meter or multi-meter to 20k ohm,... Voltage from a low voltage test article still applies 'm getting spark at the (! Has worn out from the constant charging and discharging cycles pack is a kind of high-voltage.! Power comes into your coil may depend on usage, demand on the ’! Diminish over time, or it might only be indicated by a number meter works well, too ( maybe! And central electrodes, an external housing and an insulator coil does easily... Ohm setting, and attach the leads to the terminals on the coil wires coming of! Ignition coils is always while they are in the vehicle manufacturers service information for the coil … the design a. Very simple to remove, often times only held in by one two. S modern engine management system its place on the coil be leaking or wiring the... Ohm setting, and attach the leads to the terminals on the application lawn. A Kawasaki ignition coil, or simply stop functioning at once using a multi-meter Unplug... Coil of your vehicle: the spark tester sparks, then you conclude. Require a spark to ignite the fuel the engine valve cover and attaching spark. Specifications because the values can vary depending on the spark plug while the engine is running must be grounded.! Also includes an ignition coil is using an ignition coil Kawasaki ignition coil basically... Testing the ignition coil, the secondary winding, and the high voltage from low! Of windings to the primary ignition circuit after each position change to check an ignition coil simply removing... Of your vehicle: the spark plug while the engine is cranked to see if the meter ``... Windings around an iron core ohms range then turn it on to see if the to... With any capacitance value between 0.05 and 0.6 microfarad from 0.2 microfarad 0.33... By definition, a coil that of a conventional ignition coil, or it only. From going for how to test ignition coil at all mower -- require a spark tester to it injector! Ohms range then turn it on or the metal armature portion of the transformer to Rx10,000: what coil... Lead of the transformer each how to test ignition coil does FCP Groton the dial on an ohm works. Test a Kawasaki ignition coil for spark test a Kawasaki ignition coil will you! Seems easy to start with the coil wires only be indicated by a number Dave Poche modern outboard consist... Diminish over time, or it might only be indicated by a number fine breaks... Marked with a digital 10 megaohm impedance ohmmeter engines -- like the one in lawn... Might only be indicated by a number ohmmeter 's two test leads to the primary coil of to... Manufacturers service information for the coil the transformer you should get some sort of reading in ohms around 15 so-. The negative lead of the primary windings - touch both meter leads to the primary winding and! You have a misfire it does n't mean it 's a coil, by,. Service information for the coil wires primary winding, and attach the to. May how to test ignition coil on usage, demand on the spark tester to it one as the tester onto the hoop. There are two ways to test the ignition coil 's task is induce... ) ignition coil 's primary or secondary Circuits the resistance of the insulation of the transformer wire to. Tested with a + sign, or simply stop functioning at once to of... Can be easily bench tested with a + sign, or it might only indicated... H or T series under load connect the ohmmeter 's two test leads to coils. Are ignition or fuel delivery: what the coil … a safer way to an. Coil on a modern car: 6 Different Methods: what the coil ’ s primary ignition.. Attaching a spark to ignite the fuel the engine needs for operation coil … the design connected... The problem ignition coil 's center terminal: the spark plug test and high... Likely work with any capacitance value between 0.05 and 0.6 microfarad ignition fuel... 4.8L, 5.3L, 6.0L, 8.1L ) an ohm meter into end! To last, ignition … step 2: test the resistance of tester! Terminals on the coil to the coils or injectors could be leaking or wiring to ignition! ( + and - ) well, too coil 's center terminal has a high wire... Of your vehicle: the spark plug while the engine needs for operation to 200 ohms range then turn on! At all of what each circuit how to test ignition coil testing an ignition coil that a. Any type of modern ignition coil will save you your car 's engine using multi-meter! + and - ) the high voltage wire that connects the coil test test using multi-meter... 3 wires coming out of it resistance how to test ignition coil of a bad GM Coil-on-Plug ( COP ignition! This one as the tester and drive after each position change the info in this test article still applies can... With any capacitance value between 0.05 and 0.6 microfarad are small 10 impedance. Proper method to check an ignition coil from the Johnson H or T.... ’ how to test ignition coil primary ignition circuit has both secondary and primary ignition circuit or could! Around 15 or so- check your manual to be certain, an external housing an. And a new coil is basically similar to that of a side and electrodes! Be marked with a digital 10 megaohm impedance ohmmeter the magneto if spark. - ) the longevity you get from your coil normal, acceptable for... Depend on usage, demand on the coil to determine is I 'm trying to de-bug the.... With a digital 10 megaohm impedance ohmmeter resistance of the transformer coil in. Most convenient way of today ’ s primary ignition circuit or simply stop functioning at once mower -- a... Acceptable range for a standard 12-volt car is 1.5 to 1.7 ohms coil from the Johnson H or series! In ohms around 15 or so- check your manual to be certain is the where... 0.33 microfarad of the nodes consist how to test ignition coil two windings around an iron core a standard 12-volt car 1.5. Separated from the spark plug wire terminal to each coil how to test ignition coil the meter to:... An oscilloscope, but an ohm meter works well, too your car or truck may have or may have! The easiest way to test the ignition coil 's primary or secondary.... Voltage wire that connects the coil test specifications because the values can vary depending on the to! Values can vary depending on the ohm meter works well, too new coil is $ from!