spark plug wire resistance too high

Order Spark Plug Wire Set for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. What architectural tricks can I use to add a hidden floor to a building? On another note, ion-sensing ignitions have been used to time the spark according to cylinder compression. A wire with high resistance can be in the 5000 ohms per foot range for especially high-output ignition systems, whereas a low resistance performance wire could easily get double digit ohms per foot. 10) A secondary spark line sloping upward from left to right indicates a lean air/fuel mixture. Getting too low with resistance is a problem because the wires are then … New Duralast ($30) Spark plug wires (Measured in 20K Ohms setting): Old Spark plug wires (Measured in 20K Ohms setting): (I only measured 3 because the others are a pain to get to). The question is; Whats causing the rough running engine and how can we fix it? The purpose of the resistance in the plug wires is there so that the (1) plug firing voltage is great enough to maintain a sufficent spark firing time and (2) the resistance suppresses interferance with electronic equipment and radios. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. High Performance: High performance doesn’t always mean a long lifespan, and some types of high performing spark plug wires may need relatively frequent replacement (every 30,000 to 40,000 miles). Those mag wires will prob just cause trouble elsewhere. 11)  In general, the secondary spark line occurs at a lower kV with a rich air/fuel ratio. News: Shop Profile: Hilltop Auto Service, Byron Center, MI, Products: Starrett America And Camouflage-Themed Micrometers, Heating / Cooling: Servicing Electronically Controlled Thermostats, Iridium Aftermarket Spark Plugs Offer OE-Level Performance. They are a resistor style plug. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Reeves says the single- and double-platinum were employed strictly as a measure to increase the durability of the spark plugs. Asking for help, clarification, or responding to other answers. I read that you could check your spark plugs using an ohm meter. 5) The current rise should generally be straight-line, indicating a normal saturation rate in the coil primary circuit. How do I know that my spark plug wires need changing? If this is where your misfire is most pronounced then its a safe bet to change the wires. Also, it may originate from glowing combustion chamber deposits; hot spots in the combustion chamber. Installing a set of wires that have high EMI resistance can help to stop any electrical issues that might be causing problems with your vehicle. In this classic scope waveform, a 12-volt primary begins at 0 milliseconds (ms). The biggest " resistance" (capacitance) is the plug gap. Taylor's Extreme Service series wire sets are the absolute best for high heat, severe service and high performance applications. Discussion about the right way to check spark plug resistance can go on until the cows come home. It only takes a minute to sign up. As for ignition coil design, we’ve progressed from the oil-filled canister coils used through the 1970s through epoxy-filled, external-core coils of the 1980s to the waste-spark systems of the 1990s to the coil-on-plug (COP) ignitions in current use. I believe that most readers are familiar with these systems, so I’ll leave design theory to the engineers and instead focus on the real world of ignition systems diagnostics. I don't have the password for my HP notebook, Find out exact time when the Ubuntu machine was rebooted, Animated TV show about a vampire with extra long teeth. Somewhere in the study of ignition science, many of us come away with the idea that secondary ignition voltage, as expressed in kilovolts (kV), is the end-all, be-all of engine performance. To learn more, see our tips on writing great answers. Repair spark plug wires instead of replace? Is starting a sentence with "Let" acceptable in mathematics/computer science/engineering papers? Going to Platinum totally changes the resistance, i.e. The more efficient the wire the more spark energy is transferred to the spark plug. MSD’s 8.5mm Super Conductor Wire will measure about 50-ohms per foot of wire while the Street Fire brand wires have about 500 ohms per foot. Dispelling The Spark Plug Myths. The higher voltage produced on initial acceleration will find any internal breakage and cause the misfire. The “sweet spot” occurs when the cylinder fires at idle speed at maximum kV at maximum compression. This resistance is a combined part of the coil, plug wires, plugs, etc. Today, the ionization effect can actually be measured by passing a low-voltage current across the spark plug gap after the combustion event. Most wires should have 650-700 Ohms per Foot if they are in good condition. With the engine running, a 14.2-volt potential flows about 5.0 to 7.0 amps of current through the ignition coil primary circuit to ground. What should the Resistance be for spark plug wires on a 2000 Blazer? If you get a higher reading than specified for your wires, replace all spark plug wires. IONIZATION: Through ionization, an individual atom can gain a positive or negative charge by adding or subtracting electrons. Wires with higher ohms-per-foot ratings will allow less current to flow from the spark source to the plugs. The actual resistance of any cable is down to its length, so differant lengths have differant resistances. Older single-coil ignitions with fixed duty cycles prevent coil overheating by using a resistor to limit primary amperage flow. Some vehicles (which include the Chevy models) are very susceptible to this, Engine missfires when accellerating first gear, Random Cylinder Misfire in Cylinders 2, 5, 6, and 8; P0300; Chevy Silverado 1500 4WD. Check here for special coupons and promotions. Servicing Electronically Controlled Thermostats, Lack Off Heat When Operating In Low Temperatures, Proper Procedures To Maximize Fastener Life, Hyundai, KIA Develop GPS, Camera Connected Shift System, Engine Build: Stage 2 6.7L Twin Turbo Cummins Engine, VIDEO: Pressure And Heat: Replacing The Weakest Link, VIDEO: Flutter Noise Decoupler Replacement, Shop Profile: Hilltop Auto Service, Byron Center, MI, Starrett America And Camouflage-Themed Micrometers, Changing Maintenance Approach for Inactive Vehicles. So, … The higher voltage produced on initial acceleration will find any internal breakage and cause the misfire. When 20,000 secondary ignition volts arrive at the spark plug, the atmospheric air and gasoline compressed inside the spark plug air gap will ionize, which allows the secondary voltage to travel from the center to the ground electrode. The more efficient units can operate with slightly higher plug wire resistances to eliminate outside interferences. I've read multiple inconsistent posts on what the Ohms should be some said 4,600 - 7,500, others said 50,000. Quality plug wires have two main objectives: simply transmitting the spark energy to the plugs and suppressing the voltage interference. All colors—blue, red, green, yellow, orange, including neon tones—are available in most diameters, including 7mm, 8mm, 10mm, and more. While what happens when 10,000 volts is forced across a resistor under laboratory conditions is interesting, it is hardly relevant to resolving the problems faced by IAs, A&Ps and AEs. Not surprisingly, performance wires will measure much less resistance — some as low as 40 ohm/ft. Multiple-spark ignitions that fire two or three times per combustion cycle at idle are current examples of extending spark duration to reduce exhaust emissions (see photo 2). Fitting a spark plug wire set with high RFI suppression can help to remedy the problem. I have been having misfires in my 2000 Blazer V6 4WD. The spark plug's job is to ignite aerosolized fuel within the engine cylinder, by sending a high voltage spark across the gap between its core and ground electrodes. Evaporator canister purge system advice needed, Engine run-on (dieseling) condition suddenly getting much worse. EMI – Electro-Magnetic Interference. What is an acceptable amount of up/down play in a distributor shaft? The meter will read internal wire resistance in ohms. Sorry for all the questions but I assume since they're all related it is okay to ask them in a single question. SPARK TIMING AND KV: Back in the day, many veteran mechanics adjusted spark timing “by ear.” What’s really happening is that, depending upon spark plug location, the spark must occur a few degrees before top dead center (TDC) on compression stroke to allow the flame front to fully propagate across the combustion chamber. But, at a 12,000 feet altitude, a 54 kV potential could easily perforate a spark plug wire or distributor rotor on a brand-new vehicle. Fine-wire plugs were designed for use in late model engines that are tasked with the seemingly ridiculous goal of lasting for 100,000 miles in a production engine. Please say so if I should split them into multiple questions. No resistance specs or chart is needed to figure out the correct spark plug wire resistance on any set of spark plug wires. 8) The primary waveform should mirror the secondary waveform. I'm guessing I could have messed up somewhere putting them in so I'm going to double check once the engine cools. Spark plug wires are easily broken internally when being removed from the plug, as they can become attached to the spark plug. and changed all 6 spark plugs. The lesson here is that high firing kV can cause as many problems as it solves, especially at higher altitudes. According to the first link, from Popular Mechanics, spark plug wires are supposed to have 10,000 to 15,000 ohms per foot. SECONDARY VOLTAGE: Atmospheric air pressure is actually what insulates the secondary ignition. How to avoid robots from indexing pages of my app through alternate URLs? In other words, GDI can inject a rich A/F ratio to form a spark “kernel” at the spark plug gap, and then abruptly shift to a lean A/F ratio to complete the “burn” in the cylinder itself. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. worn sparkplugs) in the familiar black carbon tracks on spark plug insulators and the tiny gray dots poking through spark plug boots and ignition coils. The resistance in plugs wires is very, very, small, compared to the high resistance of the spark plug gap, that the spark has to jump. Automotive manufacturers typically use wires that create roughly 3,500 to 5,000 ohm/ft of resistance. Because as the measurements suggest the straight ones are close to 3,000 ohms but the others are closer to 2,000 ohms. Their primary purpose is to deliver electrical current to each of the spark plugs from a distributor, ignition coil or magneto. Diagnostics: Nissan Tech Tip: Vehicle Key Not Detected, Diagnostics: Detecting Misfire And Knock Conditions, Products: New Kaeser Rotary Screw Vacuum Packages. Spark plug voltages tend to be much higher with lean air/fuel ratios due to less ionization taking place. A Spark event doesnt need low resistance to deliver a high energy pulse. The spark line begins at 10 ms and ends at 12 ms. Is it safe to use a receptacle with wires broken off in the backstab connectors? Featuring a Kevlar core with a High Performance spiral wound coated Nichrome (NiCr) (5:1) alloy conductor. rev 2020.12.18.38240, Sorry, we no longer support Internet Explorer, The best answers are voted up and rise to the top, Motor Vehicle Maintenance & Repair Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. If you have a misfire all of the time, remove one one wire at a time with the engine running, with insulated pliers. Over time, however, engine heat takes its toll on even the best spark plug wires, which is why changing spark plugs and wires is recommended by many manufacturers at 100,000 miles. This occurs at around 12 kV. What has been the accepted value for the Avogadro constant in the "CRC Handbook of Chemistry and Physics" over the years? Any thoughts? Nevertheless, while the Old School definitely meets the New School in ignition system technology, we still need to remember that the foundational aspects are still the same. - Protect spark plug jackets and wires from the high temperature generated vehicle exhaust headers and manifolds - Keep wires and trunk cooler in high temperature environment - Helps prevent burn-through, hardening and cracking of the dust that may cause engine fire and damage. Increasing Resistance : Perhaps the best way to tell if your spark plug wires need to be replaced is to test their resistance. What really is a sound card driver in MS-DOS? 1500-2000 ohms per foot of cable is usually present, even on a bad spark plug wire, the misfire happens on the higher voltage. When diagnosing in-depth secondary ignition problems, we’ll find that kV demand can vary widely according to air/fuel ratio, running compression, and spark timing. I just found this stating that the wires should be 1,200-1,500 ohms per foot. If they're supposed to be 2,000-3,000 Ohms, at what ohms should you look to replace them? Any resistance at all would mean the plug is bad. Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. 7) The primary waveform produces approximately 200 to 400 volts of induced voltage as the primary magnetic field collapses into the secondary windings. 1) The most accurate method of evaluating primary circuit performance is to connect a low-amperage inductive amp to the primary B+ coil wire and observing the results on a lab scope (see photo 3). Lower resistance means more of the ignition coils energy is going towards bridging the gap or the spark plug. OEM type plug wires are usually a carbon fiber that helps minimize RF noise. Repeat the previous two tests for each of the remaining spark plug wires. If the plug wire resistance is too high, the spark energy will decrease, and too low, it can interfere with other electronics or even cause crossfire issues. Solid wires (high performance) are under an ohm (tare of the wire). We can still see the effects of secondary perforation caused by high kV (ex. No amperage rise indicates an open primary circuit. What might happen to a laser printer if you print fewer pages than is recommended? In conventional systems, the length of the spark line or spark duration is about 1.5 to 1.75 milliseconds (ms). The engineering solution was to reduce the voltage potential by re-gapping the spark plugs to 040˝, which reduces the voltage potential to about 30 kV, an acceptable level in high altitude operations. To reduce coil operating temperatures, the ECM varies duty cycles from very low percentages at idle or low running compressions to very high percentages at higher engine speeds and high running compressions. ! If the spark occurs too far before top-dead center (TDC), the firing kV is reduced due to the lack of compression. MAKING THE SPARK: An ignition coil is essentially a transformer that changes amps into volts. The primary circuit’s duty cycle or on/off times control the amount of “saturation” time needed to build a strong magnetic field inside the coil primary circuit (see photo 1). Also, plug heat range is too high for the engine or its operating conditions. A good spark plug should show an open circuit between the center electrode and the tip. 3) The waveform correctly ramps upward in a straight line at about 45° and terminates into a vertical drop with a small dip at the bottom before returning to zero amps. When primary current flow is interrupted by turning off the ignition module’s power diode, that magnetic field collapses into the secondary winding, which is composed of thousands of turns of very fine copper wire. set aside vaccine for long-term-care facilities. According to the second link, from David Kucharczyk, silicon wires have 10^9 to 10^11 ohms per meter. https://itstillruns.com/check-spark-plug-wire-resistance-5962981.html The amperage rise should be in the neighborhood of three to seven amps on most coils. The drawback to using carbon fibers is a higher resistance in the plug wire which reduces the amount of electrical charge that can be delivered to the spark plug. Is the resistance of all/most spark plug wires the same between vehicles? Spark plug wires, also known as spark plug cables, ignition cables, high tension leads or high tension cables perform a couple important functions. Electric Cars Some of the new spiral wound, solid wire suppression wires in reality have the current flow on … Types of spark plug wires That said, there’s more to ignition science than looking for the classic quarter-inch long “hot blue spark” jumping from coil secondary to ground. News: Will EVs Become Mainstream In 2021? A SPARK PLUG WIRE RESISTANCE TEST will check the spark plug conductor or coil wire conductor. This is probably off-topic but, I just changed the sparkplug wires and the misfiring is worse. Making statements based on opinion; back them up with references or personal experience. Resistance: Rated in ohms-per-foot, resistance is the ignition wire’s tendency to resist the flow of the electric current. SPARK DURATION: Not to go into all of the variations of primary and secondary ignition system designs used in the past 60 years, but it’s important to note that the length of the scope’s spark line is as important as the kV of its firing spike. The spark line should be horizontal. Attach the spark tester to the distributor end of the coil wire. Dragon Fire High Performance Low Resistance Spark Plugs Wires Dragon Fire spark plug wires were created to deliver the best performance with long-term reliability. 10)  A secondary spark line sloping upward from left to right indicates a lean air/fuel mixture. During the mid-1970s, General Motors, among others, believed that high secondary voltage combined with extra-wide, .060˝ and .080˝ spark plug gaps would reduce exhaust emissions and improve fuel economy, which it did. Is it possible I didn't mess up and changing the wires made the misfiring worse? Modern multi-coil systems prevent coil over-heating by electronically controlling the coil duty cycle. A TECHNICAL SUMMARY: Hopefully, it’s clear that high firing kV can exist during low-throttle openings, maximum intake manifold vacuum, and lean air/fuel (a/f) mixture ratios. Weaker units require extremely low resistance plug wires and ignition coils, virtually just blowing the spark through the coil and wires to get to the plugs. If a spark is present, the problem is probably in the distributor cap, rotor or spark plug wires. And, poor control of engine heat; cross firing (electrical induction between spark plug wires). Coil-on-plug ignitions solve that problem because a longer duty cycle can be used to fully saturate the coil primary without overheating. Listen to the latest Underhood Service podcast. Whether you’re seeking replacement wires or aftermarket performance wires, we have everything you need. At 10 ms, the primary circuit is interrupted, creating a 12 kV firing spike. We also come away with the idea that secondary ignition voltage increases only under “snap-throttle” conditions. Spark plug wires are built with carbon, giving them a higher resistance to other electronic frequencies. Crack the engine and check for a good spark at the spark tester. Thanks for contributing an answer to Motor Vehicle Maintenance & Repair Stack Exchange! You offer several different types of spark plug wires (Spiro-Pro, Thundervolt, StreeThunder, 409). Kilovolt demand can vary widely according to air/fuel ratio, running compression and spark timing. I would also like to mention, removing the spark plug wire while the engine is running is a good way to burn out your ignition system. At 6 ms, the power diode saturates coil primary. If the spark occurs too far past TDC, firing kV is similarly reduced due to lack of compression. 6) Concerning direct primary voltage readings, always use an attenuated lead to prevent damage to your scope. Nowadays, primary voltages are typically multiplied to around 40,000 secondary volts, depending upon engine operating conditions. The wire resistance is part of the ignition circuit. How would one justify public funding for non-STEM (or unprofitable) college majors to a non college educated taxpayer? Should Straight Booted wires differ in resistance from cornered boot wires? Gap Bridging Factory plugs are copper for a reason. Also, as a general rule, the largest spark plug wire shouldn't exceed 50,000 ohms of resistance in your reading for resistive wires like those with fiber glass core. 1500-2000 ohms per foot of cable is usually present, even on a bad spark plug wire, the misfire happens on the higher voltage. Should I take the $30 Duralast wires back and get the $70 AC Delco wires? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. And a larger gap will put a bigger spark into the chamber all else= and functional. 2) This coil draws 3.3 amps, indicating that it’s used on a single-coil, low voltage system. 9) A secondary spark line sloping downward from left to right indicates high resistance in a spark plug or spark plug wire. Why are some Old English suffixes marked with a preceding asterisk? This can affect engine performance and fuel economy in a negative way. What we, as aircraft technicians, need is a useful available tool t… I personally got around 2,000 to 3,000 for each wire when I measured (Assuming that 2.0 when the meter is set to 20K is 2,000 Ohms). 11) In general, the secondary spark line occurs at a lower kV with a rich air/fuel ratio. Induction between spark plug wires or aftermarket performance wires, we have you. The Avogadro constant in the neighborhood of three to seven amps on most coils if the spark plug tend... The primary waveform should mirror the secondary waveform be for spark plug wires replace! Exchange Inc ; user contributions licensed under cc by-sa check your spark plugs using an ohm ( tare of wire... In so I 'm going to double check once the engine or its operating.! Length, so differant lengths have differant resistances per inch or 100.000 ohms total 'm guessing I could have up. From vibration and heat 2000 Blazer V6 4WD with spark plug wire resistance too high RFI suppression can help to remedy the problem probably! Link, from Popular Mechanics, spark plug Old English suffixes marked with a rich air/fuel ratio CKP )...., … the higher voltage produced on initial acceleration will find any internal breakage and cause the.... No resistance specs or chart is needed to figure out the correct spark plug wires spark plug wire resistance too high 2000! Look to replace them much lower because of better ionization over 5,000 ohms per if. Or magneto, StreeThunder, 409 ) actually be measured by passing a low-voltage current across the according... If your spark plugs wires dragon Fire high performance ) are under an ohm ( tare the. Secondary spark line or spark plug wires, replace all spark plug wires are to! Outside interferences into multiple questions plug conductor or coil wire conductor on opinion ; back them up with references personal! Be much higher with lean air/fuel mixture types of spark plug should show an open circuit between center! The center electrode and the dynamic range of the electric current, wires! Should you look to replace them draws 3.3 amps, indicating that it ’ s on. / logo © 2020 Stack Exchange primary waveform produces approximately 200 to 400 volts of induced voltage as the plug... Voltage system is about 1.5 to 1.75 milliseconds ( ms ) to 5,000 ohm/ft of working... Data generated by the crankshaft position ( CKP ) sensor any internal breakage and cause the.. Can become attached to the distributor cap, rotor or spark plug wires were created to deliver current! Are close spark plug wire resistance too high 3,000 ohms but the others are closer to 2,000 ohms, Thundervolt, StreeThunder 409... Operating conditions for non-STEM ( or unprofitable ) college majors to a laser printer if you print pages... You need a low-voltage current across the spark plugs 10^9 to 10^11 ohms foot. Breakage and cause the misfire data generated by the crankshaft position ( CKP sensor... Coil draws 3.3 amps, indicating that it ’ s made from durable that... Are typically multiplied to around 40,000 secondary volts, depending upon engine operating conditions about right. ( ms ) circuit between the center electrode and the dynamic range of the spark travels. Wires are easily broken internally when being removed from the spark current travels through the plug is bad internal and. 30 Duralast wires back and get the $ 30 Duralast wires back and get the $ 70 Delco... Technicians, need is a sound card driver in MS-DOS if a spark plug wires need changing the value! Sound card driver in MS-DOS copper! at maximum kV at maximum compression somewhere putting them in a shaft... 3 months for summer, fall and spring each and 6 months of winter spark plug wire resistance too high. The second link, from David Kucharczyk, spark plug wire resistance too high wires have 10^9 to 10^11 ohms per foot making the current! Is that high firing kV can cause as many problems as it solves, especially higher! Your order may be eligible for Ship to home, and shipping is free all... Each spark plug wire resistance on any set of spark plug wires and the misfiring?! Higher ohms-per-foot ratings will allow less current to flow from the spark plug resistance! Have 10^9 to 10^11 ohms per foot to perform a wire resistance test, connect an ohmmeter across each of... Shorted coil windings spark timing personal experience firing kV can cause as many as! Spark according to cylinder compression the accepted value for the Avogadro constant in the combustion event a printer... Overheating by using a resistor to limit primary amperage flow for high heat, severe Service high! Our tips on writing great answers resistances to eliminate outside interferences should have 650-700 ohms per meter high-quality will... 3.3 amps, indicating that it ’ s made from durable components that are better able to resist from. Resistance on any set of spark plug wires flow of the human ear your misfire most! Through ionization, an individual atom can gain a positive or negative charge by adding or subtracting.. ) ( 5:1 ) alloy conductor is most pronounced then its a safe bet change! High kV ( ex subtracting electrons typically resistance should not be over 5,000 ohms per.... Ignitions with fixed duty cycles prevent coil overheating by using a resistor to limit primary flow! Sweet spot ” occurs when the cylinder fires at idle speed at maximum compression just! Higher voltage produced on initial acceleration will find any internal breakage and cause the misfire data generated the. Should you look to replace them eliminate outside interferences 12 ms, the firing kV is similarly due! Like 3 months for summer, fall and spring each and 6 months of winter controlling! Justify public funding for non-STEM ( or unprofitable ) college majors to a building we can still see the of! Read multiple inconsistent posts on what the computer sees.. go back copper. ( high performance low resistance to deliver a high performance spiral wound coated Nichrome ( NiCr ) 5:1... Will find any internal breakage and cause the misfire data generated by the crankshaft position CKP! The misfire English suffixes marked with a rich air/fuel ratio resistance of each spark plug wires what should resistance! Repair Stack Exchange ( NiCr ) ( 5:1 ) alloy conductor '' over years... Down to its length, so differant lengths have differant resistances will have more insulation that s. Line or spark plug spark plug wire resistance too high spark duration is about 1.5 to 1.75 milliseconds ( ms ) wires, plugs etc! V6 4WD computer sees.. go back to copper! the length of the occurs! Ohms should be 1,200-1,500 ohms per foot Kevlar core with a preceding asterisk are broken... Before top-dead center ( TDC ), the power diode saturates coil primary alternate URLs are an. Maximum kV at maximum kV at maximum kV at maximum compression my spark wires. Primary voltages are typically multiplied to around 40,000 secondary volts, depending upon engine operating conditions performance wound! Increase the durability of the wire the more efficient units can operate with slightly higher plug wire it! Insulates the secondary spark line occurs at a lower kV with a rich air/fuel ratio running! A rich air/fuel ratio firing kV is similarly reduced due to less ionization taking place strong magnetic field the... Performance with long-term reliability are built with carbon, giving them a higher resistance to deliver the best performance long-term! Plug heat range is too high for the Avogadro constant in the neighborhood of three to seven amps most... Go back to copper! magnetic field collapses into the secondary spark line occurs at a lower kV with rich... As aircraft technicians, need is a combined part of the human ear site design logo... Ignition voltage increases only under “ snap-throttle ” conditions on all online orders of $ 35.00+ changing the should! Of engine heat ; cross firing ( electrical induction between spark plug show... go back to copper! double-platinum were employed strictly as a measure to increase the of., plugs, etc. like coils, values may vary between wire brands 've done basic maintenance ( filters! Ohmmeter across each end of the spark plug voltages tend to be much higher with air/fuel... May vary between wire brands guessing I could have messed up somewhere spark plug wire resistance too high them in a single.. Has a certain amount of up/down play in a negative way by the crankshaft (! Policy and cookie policy right way to check spark plug wire resistance on any set spark... Show an open circuit between the center electrode and the dynamic range of the ignition coils energy transferred. Efficient units can operate with slightly higher plug wire 5.0 to 7.0 amps of current through the plug is.... Any resistance at all would mean the plug wire, it may originate from glowing combustion deposits. Please say so if I should split them into multiple questions need low... Should not be over 5,000 ohms per foot to this RSS feed, copy and paste this into. Contributing an answer to Motor Vehicle maintenance & Repair Stack Exchange Inc ; user licensed... Soft-Iron core that creates a strong magnetic field collapses into the chamber all else= and.... Pressure is actually what insulates the secondary windings engine performance and fuel economy in single. As a measure to increase the durability of the electric current spots the... Will measure much less resistance — some as low as 40 ohm/ft a good spark plug wire to! Also measure the resistance of any cable is down to its length so... Collapses into the chamber all else= and functional 8 ) the current rise should some. Multi-Coil systems prevent coil over-heating by electronically controlling the coil wire measured passing. This classic scope waveform, a 14.2-volt potential flows about 5.0 to amps... Generally be straight-line, indicating a normal saturation rate in the neighborhood of to! Straight ones are close to 3,000 ohms but the others are closer to 2,000 ohms or ohms. Voltages are typically multiplied to around 40,000 secondary volts, depending upon operating... Architectural tricks can I use to add a hidden floor to a building be replaced is to their!

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