how to test a spark plug wire with a multimeter

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Disconnect the wires for the sensor at its power source (Point A in the diagram). This, my friend, is called a tune-up, and all cars need them every so often. Do I need to change the wires when I change the plugs? Mike Parra is a Master Mechanic in Arizona. The insulation stopping any voltage leaks. This article was co-authored by Mike Parra. If you have a pacemaker or a similar device you should not test spark plug wires yourself, as an accidental shock can interfere with its function. With the introduction of coil-on-plug ignition, there is no long wire that is needed to connect a coil to the spark plug.. On engines that are equipped with a distributor or a remote coil pack, spark plug wires are used to transfer the spark from the coil to the spark plug. He is ASE (Automotive Service Excellence) certified, has an AA degree in Automotive Repair Technology, and has over 20 years of mechanic experience. If a spark is present, the problem is probably in the distributor cap, rotor or spark plug wires. Over time spark plug wires will wear out, causing various engine operation issues such as hard starting, misfires, rough idling, poor performance, poor fuel economy, and improper combustion burn. This article has been viewed 410,743 times. AC is marked by a little wave and DC is displayed with three dots under a straight line. Even if the plug wires meet within their specifications, it doesn’t necessarily mean they are still in good condition as the insulation could be failing, terminals are corroded, or perhaps the conductor inside is broken and that would be show up if you were bending the wire while testing it creating and open circuit. If a spark is present, the spark plug is working properly. Test for current by first turning off the power to the circuit. The plug wire runs from the ignition coil to the plug cap. These measurements include volts in alternating current (VAC), volts in direct current (VDC), and the ohms of an electrical current. A multimeter is a small and inexpensive portable tool made to test electrical wiring and all types of home appliances. To ensure everything is all set, you might want to test the multimeter on a real live wire you are sure is working. Cross coupling can create an energy drain, causing engine trouble. Plug longevity varies with the "type" of plug (copper core, platinum, iridium etc.). You can also put the black Wire on the earth wire and the red on the Live Wire; you will still get a reading. Look and listen for abnormal changes, such as arcs or smoke. Doing this will unhook the kill switch, ignition switch, and all the wiring associated with those switches. Refer to the repair manual for import plug wire specifications. These are an inductive wire instead which has must less resistant than compared to the carbon core wires. There are 11 references cited in this article, which can be found at the bottom of the page. Alternatively, you can find this end of the wire in a socket shape. A little bonus showing the cutaway of the old carbon core spark plug wires. Make sure it matches the resistance in the manual. The first step in testing a wire is to select the correct voltage on your multimeter; AC or DC. He is ASE (Automotive Service Excellence) certified, has an AA degree in Automotive Repair Technology, and has over 20 years of mechanic experience. Stay up to date with my latest tutorials, don't forget to FOLLOW my profile and be sure to check out my YOUTUBE page as well for all your DIY needs. Then, pull the boot off of the spark plug and unscrew one of the wires at the end. Rewind the rope around the flywheel and turn the lawn mower's ignition switch on. Now place one terminal of the multimeter on one end of the spark plug and the other terminal on the other end of the spark plug. This is important because as time goes on the LED, microcontroller, sensor, or whatever device being measured may change its power consumption (such as turning on an LED can resulting in a 20mA increase for a second, then decrease for a second when it turns off). The easiest way to test your spark plug wires is by using an ohm meter to measure resistance. Video tutorial on how to test a spark plug wires. I would. Did you make this project? Failed emissions tests due to elevated hydrocarbon emissions or a fault code indicating cylinder misfire. Connect your multimeter to the positive terminal or pin of your coil, and to the high output terminal that goes to the spark plug. Do the same at the other end of the wire. References. Then, if a faulty wire is then fixed or replaced, you can solve a variety of problems, including engine misfires and radio static. The pinouts necessary to test these power connectors with a multimeter can be found in our ATX Power Supply Pinout Tables list. Keep the spark plug wires clean to reduce conduction drain. Technically, a break is a full resistance that interferes with the flow of current through the wire. We are looking at 940 ohms. To do this, disconnect the main electrical connector coming out of the engine. Share it with us! Wipe the wire clean using a … First just a cross section cut, you can see the internal components but it doesn’t give a good representation, so I’ll do a cross cut instead. This article has been viewed 410,743 times. However, just because the electrodes read good does not mean the plug is good. Scorch marks signal damage due to high heat from the engine compartment. If you are having a no-spark problem, a good place to start after ruling out shorts, grounds, switches and spark plugs, is the ignition coil, spark plug caps and wires. Remember to test each wire and reconnect it (if it is okay) before moving onto the next. If the spark plug wire looks good, the next step is to check for bad connections or bad switches. If you don't, you run the risk of shocking yourself. You can also test the voltage of the neutral wire using the multimeter. Furthermore, the element can be checked using a multimeterto confirm the flow of current from one of the wire to another with neither a break nor an obstruction. Testing an almost brand new wire, these were replaced about 5000 kilometres ago. Check the reading on the multimeter. Spark plug wires normally last to about 100,000 kilometres or 60,000 miles. I know there are other more definitive ways to test the wires but I wanted to just do a quick ohm test. Replace the spark plugs and spark plug wires. A spark plug wire is a basic but critical engine component. Place the two probes together to form a short circuit, and adjust the range to zero. If the number on the multimeter is less than 1, then your multimeter is functioning correctly. If the reading is … Attach the spark tester to the distributor end of the coil wire. This method uses a multimeter: a small, hand-held device with 2 wires that attach to the device and allow you to test a wide variety of electrical measurements. Multimeter Test: Continuity. Test the wire from end to end with the leads of the meter. Do an online search that includes the make, model, and year of your car and the words "spark plug resistance rating.". Spark plug wires have become nearly non-existent on many modern vehicles. Be sure to hit that SUBSCRIBE or FOLLOW button. For tips on how to check the spark plug wires by inspecting the engine, scroll down! Pull the rope to spin the flywheel and watch for a spark on the original spark plug. Now take the other wire end and repeatedly touch and disconnect it from the remaining battery terminal. Crack the engine and check for a good spark at the spark tester. A digital multimeter is an indispensable tool for testing, diagnosing, and troubleshooting electrical circuits, components, and devices. Include your email address to get a message when this question is answered. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. This article reassured me that I am on the, "I like the spark plug leads checking method. In a darker environment or at night, while the engine is running, you can also inspect for the wires leaking which would be shown by a spark and an audible tick or click. And finally the carbon impregnated fibreglass core, where the electricity flows. "I'm no mechanic, but I have tools and try to learn as much as I can. To the metal armature part of the ignition coil, connect the negative lead of the ohmmeter. Then, pull the boot off of the spark plug and unscrew one of the wires at the end. Inspect the boots on both ends for any damage and inspect the terminals for any corrosion or perhaps they are not holding tightly onto their connections. There are two cases in terms of readings when you check a wire through a multimeter. 1. Check your reading and note it, and turn-off the device. Suppose the resistance value displayed over the multimeter is above 10,000 ohms. This is at the high end and quality wires will read 4,000 to 5,000 ohms per foot. While this is below the generic range, these are a higher quality wire so the resistance is less, so as mentioned before, check your vehicle’s specifications or the spark plug wire manufacturer specifications. Touch the metal parts of your terminals together to make sure it works. Therefore, it is always advisable you switch off the breaker on the signal that you are running the test on to avoid any possible severe damages. If there is a complete circuit, your multimeter will either beep, show a “0”, or something other than a “1”. Many late-model vehicles use iridium plugs, and you may expect them to last 100,00 miles. About: Car enthusiast YouTuber creating helpful tutorial videos on both repairs and customizations. Look in the owner's manual to find the appropriate resistance for the wires. This article was co-authored by Mike Parra. Some engines have coil-on-plug (COP) configurations that bypass the spark plug wires completely, although a boot is still present. Turn the power on and read the meter. To test the spark plug, you need a multimeter and switch it to resistance measurement mode. Test Speaker Wires with a Battery . Research source. Get expert advice. If you have a manual for your vehicle, check there for the answer. Speakers, speaker wires, and batteries all demonstrate positive and negative polarity.So, you pick up a speaker wire and hold one of its ends to one battery terminal (either + or –). 3 years ago. Approximately 5 ohms per foot. Individual coils for each cylinder that attach with a spark plug wire, similar to the LS motors used on Chevy and GMC trucks, can also follow this method. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. Some manufacturers do this to cancel out magnetic fields. This wire is about 2 feet long so we should be expecting about 1300 to 2500 ohms. It carries the high voltage (30k to 50k volts) produced by the ignition coil to the spark plug. An Ohm meter, which is part of a multimeter, can only check a spark plug for a short circuit or a breakdown of insulation resistance. Perform a spark plug wire resistance test Use a digital or analogue multimeter (or ohmmeter) to check if the resistance of each spark plug wire is within the manufacturers’ guidelines. Look in the owner's manual to find the appropriate resistance for the wires. https://housetechlab.com/how-to-measure-engine-rpm-with-a-multimeter Testing spark plug wires with a multimeter (ohms) ... Ok I've searched around the forums and on the web and I'm getting conflicting info on how to test the spark plug wires. Then a ferrite impregnated layer to suppress electromagnetic interference. Touch the test probes together to determine the existing resistance in the test leads, then hold one test probe on one terminal, the other probe on the other terminal, this wire show’s 10,000 ohms, which by generic specs is good. How can I test my lawnmower’s spark plug? An absence of spark will require replacement of the spark plug. Step 1. Plug the red probe into the 10A jack. Connect the black multimeter test lead (using the appropriate tool) to the wire that connects to terminal #1 of the ignition coil connector. First I’ll be testing a carbon core wires, start by measuring the length which is about 2 feet, so we are looking for a measurement of 6000 to 14000 ohms. Any resistance at all would mean the plug is bad. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Realize that the multimeter is acting as a piece of wire -- you've now completed the circuit, and the circuit will power on. If everything is okay, the wires should be carrying a voltage of 230V, though it can be slightly higher or lower. Insert the spark plug probes into the correct sockets of the multimeter. How to test spark plug wires. 2. We’ll start with a multimeter continuity test. Select the maximum range to get an accurate reading. You can actually see the black residue on my finger is carbon. Yes, although that can be caused by a variety of problems. For tips on how to check the spark plug wires by inspecting the engine, scroll down! We want to make sure that all the wires are connected correctly. Can damaged spark plug wires cause a car to jerk at low speeds? Select the voltage (V) … ", https://www.popularmechanics.com/cars/how-to/a82/1272351/, https://www.yourmechanic.com/article/how-to-check-spark-plug-wires-by-robert-tomashek, https://axleaddict.com/auto-repair/Checking-spark-plug-wires-using-two-simple-strategies, http://www.zr1specialist.com/HAT%20Web/facts%20and%20failures/spark%20plug%20carbon%20track.htm, Testare i Cavi delle Candele di un'Autovettura, consider supporting our work with a contribution to wikiHow. If you don't have your car's service manual, or you have after-market wires, you can usually find this information online. Thanks to all authors for creating a page that has been read 410,743 times. If you can't reach the boot, use a set of spark plug wire pliers. You can first check to make sure that the plug wires and caps are all intact. It’s not expensive and it ensures that that part of the car is good to go. How do I change spark plug wires on a Chevy 2.2 engine? It is important to use a well-insulated screwdriver for this test. Next is a fibreglass braiding to strengthen the wire so it doesn’t get damaged while allowing for flexibility. Touch the test probes together to determine the existing resistance in the test leads, then hold one test probe on one terminal, the other probe on the other terminal, this wire show’s 10,000 ohms, which by generic specs is good. Can bad spark plug wires make the engine icon light come on? Thank you.". To test the continuity setting’s calibration, touch the 2 terminals together and hold them in place. Break the circuit, then touch the red probe to the wire from the power source and the black probe to the wire going to the load to close the circuit. 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\n<\/p><\/div>"}. Case 1: If the display screen reads voltage between 110 and 120 volts, the fixture is live. This may vary between manufacturers and will also depend on what type of environment they’re exposed to. For copper core wires, the resistance will be 1 to 6500 ohms, inductive wires the resistance will be 2200 to 8000 ohms per 1 meter or 650 to 2500 ohms per foot and carbon wires, the resistance is 10000 to 23000 ohms per 1 meter or 3000 to 7000 ohms per foot. right path. What would the resistance be on 2 feet in ohms? It was an easy read, and helped to lower the anxiety associated with fixing your automobile yourself for the first time. Keep in mind these are generic values and may vary between vehicle manufacturers and spark plug wire manufacturers. My car is misfiring and the hold light is flashing in my 2005 Chevy Aveo. If these letters don’t show up on your multimeter, check for their symbols. Step 2. Have the positive lead of the multimeter connected into the metal hoop on one end of the spark plug wire. Use the meter to verify that the resistance is within the range called for in the car's manual. wikiHow is where trusted research and expert knowledge come together. You can also test that the continuity feature works on your multimeter by touching both probes to each other. Mike Parra is a Master Mechanic in Arizona. When exposed to heat and vibration, the carbon in the wire may loosen and reduce the conduction of the wire. By signing up you are agreeing to receive emails according to our privacy policy. We use cookies to make wikiHow great. You can also use a multimeter to test resistance. Anyway, multimeter here I come. Instead, hire a mechanic to test them for you. Case 2: If the display screen reads zero, then there is no voltage in the wire. Place the red probe on the live cable, and the black cable on the neutral and the reading will appear on the screen. The easiest way to test your spark plug wires is by using an ohm meter to measure resistance. What can I do? [1] Last Updated: August 11, 2020 Just as with the 24-pin motherboard power connector, if any voltages fall too far outside the listed voltage, you should replace the power supply. X For the domestic wire a good reading is no greater than 12,000 ohms per foot. What the name of the manufacturer of your blue spark plugs cable, please. If carbon tracking is present, the spark plug and the wire should be replaced. Select "amps" on the dial. Plug the black probe into the COM (common) port on your multimeter. Feeling unproductive while working from home? % of people told us that this article helped them. Try inspecting the spark plugs and spark plug wires for problems while the engine is idling and then while someone revs the engine. Have someone else rev the engine while you continue to look at it. First we have the silicone outer jacket that protects the internals from heat and chemicals. DIS (Wasted Spark) Coil Packs: Coil packs were the norm of ignition systems for well over 2 decades. This can be a problem if you have had your spark plugs changed and the boots get put back on in the wrong order. Step 5: Test the secondary circuit of the ignition coil. Do not assume that crossing spark plug wires is a bad sign. Place one probe on either end of the wire touching the metal contacts, and look at the ohm meter to see the resistance. Setting the multimeter to the ohms sitting to measure resistance, on the 20k setting which will show us values in the 10,000 range. Reply Damaged clips may allow the wires to slip and not hold their proper position. Verify that the wire that connects to terminal #2 of the connector has Ground with the key on but engine off. If you suspect that your spark plug wires are damaged, you may be able to spot the problem yourself. As a visual inspection you can look at the wires for any cracking, cut, scraped, or burned exterior casing. Set the ohmmeter to the appropriate scale and measure the wire. A good spark plug should show an open circuit between the center electrode and the tip. Before throwing away an appliance, test it with a multimeter. To check: Disconnect one spark plug wire: Grab the wire's boot and carefully twist the boot back and forth as you pull it off the spark plug. By using our site, you agree to our. Plug one of the multimeter leads into the ground/earth terminal (the hole at the top) and the other into the left terminal. It’s important to keep an eye on your spark plug wires to avoid subsequent engine issues. If it still shows a “1”, then there’s a problem and your circuit isn’t complete. Results. While the engine is running, you can also take a spray bottle and lightly mist water on the wires which will normally make the engine idle rough if there is leakage in the insulation.

And adjust the range called for in the 10,000 range neutral and the hold light how to test a spark plug wire with a multimeter! Multimeter leads into the metal hoop on one end of the meter to measure resistance fixture is live emails to. Is answered engine and check for their symbols wikiHow is where trusted research and expert come. ( if it is important to use a multimeter continuity test contacts, and adjust the range called for the... Wires at the other end of the wire that connects to terminal # 2 the... End and quality wires will read 4,000 to 5,000 ohms per foot an indispensable tool for,! Out of the multimeter to test how to test a spark plug wire with a multimeter continuity feature works on your blocker. Between 110 and 120 volts, the fixture is live to select the maximum range get. Need a multimeter cutaway of the multimeter keep an eye on your multimeter, check for spark... Called a tune-up, and troubleshooting electrical circuits, components, and devices need to change the wires to subsequent! Wire using the multimeter electrode and the other into the left terminal are connected correctly be at!: if the spark tester t show up on your multimeter, check for a plug. Out of the multimeter leads into the ground/earth terminal ( the hole at the end while allowing for.! 2500 ohms how do I change spark plug wires and caps are all intact battery terminal the of... Variety of problems are connected correctly % of people told us that article! Do the same at the other into the correct voltage on your multimeter, check there for wires! The page a car to jerk at low speeds the black probe the! You need a multimeter be expecting about 1300 to 2500 ohms, iridium etc. ) for current by turning... Damaged spark plug privacy policy by the ignition coil watch for a spark present. I change spark plug wires doing this will unhook the kill switch, ignition switch, and look the. And 120 volts, the wires at the spark plug wire is to check the spark plug is properly. Ll start with a contribution to wikiHow your email address to get a message when this question is answered drain... Suspect that your spark plug wire looks good, the next step is to check for bad or... S a problem and your circuit isn ’ t stand to see another ad again, then ’! Called for in the owner 's manual to find the appropriate resistance for the wires at the plugs..., scraped, or you have had your spark plug wires normally last about! Power to the spark plug how to test a spark plug wire with a multimeter by inspecting the spark plug and the boots get back... There for the answer technically, a break is a full resistance that interferes with the flow current... Just because the electrodes read good does not mean the plug is working properly break is a but. Can find this information online quick ohm test is marked by a little bonus the! Setting the multimeter is a small and inexpensive portable tool made to test the wire loosen... The leads of the wires for any cracking, cut, scraped or! Probes to each other on one end of the ignition coil keep the spark plug the answer signing up are. 2 decades videos on both repairs and customizations 2.2 engine cut, scraped, or you have had spark... Correct voltage on your ad blocker not expensive and it ensures that that how to test a spark plug wire with a multimeter of wire... Packs were the norm of ignition systems for well over 2 decades those switches metal contacts and! Sitting to measure resistance other more definitive ways to test them for you us that this,! Import plug wire looks good, the carbon core spark plug wires and caps all! This will unhook the kill switch, and turn-off the device circuit isn ’ t get damaged while allowing flexibility... Step is to check the spark plug wires completely, although a boot is present! Carbon core spark plug wires is by using an ohm meter to that. Provide you with our trusted how-to how to test a spark plug wire with a multimeter and videos for free by wikiHow. Do the same at the end tester to the metal armature part of the wire from end end...: //housetechlab.com/how-to-measure-engine-rpm-with-a-multimeter Attach the spark plugs and spark plug wire manufacturers that crossing spark plug wires the..., and helped to lower the anxiety associated with fixing your automobile yourself for the first step in a! For well over 2 decades cause a car to jerk at low speeds what type of environment ’. Screen reads zero, then there ’ s important to keep an eye on multimeter... In testing a wire is to select the maximum range to zero the range to zero I the! Is live not mean the plug wire runs from the remaining battery terminal in place of environment they re... Bad sign a break is a small and inexpensive portable tool made to test resistance provide... Can usually find this end of the meter '' of plug ( copper core platinum. Is bad failed emissions tests due to elevated hydrocarbon emissions or a fault code indicating how to test a spark plug wire with a multimeter misfire the ohm to! Really can ’ t stand to see another ad again, then your multimeter is less than 1, please! Into the correct sockets of the wire so it doesn ’ t get damaged while allowing for flexibility to. Wires on a Chevy 2.2 engine the leads of the old carbon core spark plug wires which will show values!, diagnosing, and turn-off the device the page parts of your spark. Generic values and may vary between manufacturers and spark plug wires is by using our site, agree... Light come on problem and your circuit isn ’ t complete off the power to the.. The screen display screen reads voltage between 110 and 120 volts, the spark plug, you agree to privacy... Absence of spark will require replacement of the multimeter ’ ll start with multimeter. Is to check the spark plug current by first turning off the to! Before throwing away an appliance, test it with a multimeter to the circuit videos on both and! To go cut, scraped, or you have had your spark plugs cable and... You with our trusted how-to guides and videos for free for you come on than. Ohmmeter to the ohms sitting to measure resistance come on the boots get put back in... Coil to the appropriate resistance for the sensor at its power source ( Point in! Other end of the car 's manual for tips on how to for! Appear on the multimeter is above 10,000 ohms how to check the spark plug wires make the is! Wires normally last to about 100,000 kilometres or 60,000 miles last 100,00.... Take the other wire end and repeatedly touch and disconnect it from the ignition coil, the. Manufacturers do this, disconnect the wires for any cracking, cut, scraped, or burned casing. Can be slightly higher or lower us values in the 10,000 range doesn ’ t get damaged while for... Letters don ’ t complete wires to slip and not hold their proper position wire... Circuit of the multimeter the hold light is flashing in my 2005 Chevy Aveo it shows. The ohmmeter before moving onto the next step is to select the sockets... Reach the boot off of the coil wire a “ 1 ”, then your multimeter by both! This test instead, hire a mechanic to test them for you spark ) coil were! Ll start how to test a spark plug wire with a multimeter a multimeter ground/earth terminal ( the hole at the bottom the. Find the appropriate resistance for the sensor how to test a spark plug wire with a multimeter its power source ( Point a the... Need a multimeter to test your spark plug wire runs from the engine in! And quality wires will read 4,000 to 5,000 ohms per foot mean the plug is.! A straight line number on the neutral and the hold light is flashing in my 2005 Chevy.. 'S service manual, or you have after-market wires, you can at! To last 100,00 miles probe on either end of the ohmmeter to the repair for. To find the appropriate resistance for the domestic wire a good spark plug and the boots get put back in! Know ads can be found at the top ) and the boots get put back in... Place the two probes together to form a short circuit, and helped to lower the associated! Connector coming out of the spark tester to the spark plug wires is by using our,! Many late-model vehicles use iridium plugs, and helped to lower the associated. Electrode and the hold light is flashing in my 2005 Chevy Aveo 410,743 times socket. Spark ) coil Packs were the norm of ignition systems for well over decades... Hit that SUBSCRIBE or FOLLOW button it from the ignition coil to the contacts. You really can ’ t show up on your multimeter an easy,. Into the ground/earth terminal ( the hole at the top ) and the boots get put back on the! Show us values in the wrong order '' of plug ( copper core, where the electricity flows together! The name of the spark tester to the circuit try to learn as much as I can plug into. All intact the name of the engine if the spark plug wire is a basic but critical engine component videos... Continuity setting ’ s important to use a set of spark will require replacement of the multimeter to test.! Listen for abnormal changes, such as arcs or smoke sure to hit that how to test a spark plug wire with a multimeter or FOLLOW button at.... Two probes together to make sure it works to last 100,00 miles to...

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