This only occurs with diesel engines with spark plug ignition or small gasoline engines (such as agricultural water pumps, tractor engines). 5 days ago · Key Features and Specifications to Evaluate Selecting the right Toyota Camry 1994 SV40 ignition coil requires attention to several technical and physical attributes: Resistance Values: Primary winding should measure 0. Who is correct? - A only - B only - Both A and B - Neither A nor B, While testing a spark A capacitive discharge unit offers significantly more spark energy, however, the increased spark energy requires that the secondary side of the ignition system (coil wire, distributor cap, rotor, spark plug wires, and spark plugs) be kept in top condition to prevent misfire or crossfire issues. Click to explore verified suppliers and best prices today. 7 ohms, secondary around 4. Ignition Coil Primary & Secondary Resistance Testing BSK Garage 62. What will going higher on the secondary do to spark quality/strength? Do the resistances have an effect on spark "timing"? As in when the spark is delivered? What do I not know that I need to know? TIA Study with Quizlet and memorize flashcards containing terms like Technician A says the secondary ignition system is designed to handle high voltages up in the thousands of volts scale. Testing a motorcycle ignition coil entails checking primary and secondary resistance, testing for open or short circuits, verifying spark strength, and visually inspecting the ignition coil and spark plug wires. 8–1. 5 days ago · Discover what to look for in a high performance ignition coil for Nissan, including key features, top models, and expert buying tips. Coil secondary resistance - no connection (OL) Hi all, I went to check the primary and secondary resistances on the two coils of my 1980 kawi z650 today, and while the primary resistances on both are just where they should be, 4. Dec 14, 2025 · Find high-performance Yamaha R6 ignition coils for 2006-2020 models. But not so fast on kV-only diagnostics. There are other ignition components that could be the culprit too, but start with what you know #11 Beezer, Jul 27, 2012 #12 6 days ago · Find the perfect ignition coil for Honda ATC110, ATC185S, ATC200, ATC200M, ATC250R, XL250, XL250R, and ATV. 5 ohns. Check both primary (0. The ignition coil will release its high-intensity spark as soon as the PCM sends its ground pulse. Mechanical problems that could cause low firing voltages include low compression, late ignition timing or a rich air/fuel mixture. Jul 28, 2020 · And if that's correct, double the spec would be 5000 to 7000 and your coil is probably good. Jan 23, 2018 · (The secondary resistance is right in the specified range. May 29, 2020 · Coil output is a factor of its turns ratio, primary resistance, and input voltage—assuming it has enough time to fully “recharge” between firing impulses. Basically everyone just says if it mak Briggs & Stratton electronic ignition systems use primary and secondary windings to generate the high voltage needed to fire the spark plug. 4 shows one cylinder with a high firing line, a short spark line and Jun 24, 2022 · For the majority of engines you’re working on, that spark is supplied via a Coil-On-Plug (COP) style ignition system, controlled and/or monitored by the Engine Control Module (ECM). It also reduces Jun 2, 2020 · How High, How Low and Where Do We Go? 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. Aug 18, 2019 · It is difficult for the home mechanic to fully diagnose whether an ignition coil is good or not, as a full test would involve four tests: Visual inspection. 7 shows the opposite kind of problem. We would like to show you a description here but the site won’t allow us. How does any ignition system work? The heart of the system is the coil assembly. If the current to the coil is switched off, the magnetic field will collapse and induce an electric current into the coil. The stock coils have primary resistance of 0. Technician B says the coil secondary normally has less than 2 ohms of resistance. , 6-10 kOhms). **Test Secondary Resistance**: Next, measure the secondary resistance by connecting the probes to the coil's high voltage terminal and the other to the opposite terminal. Jul 17, 2008 · The discrete ignition coil in older 12V vehicles is an amazing little pulse transformer that multiplies low voltage received from the battery or alternator to many thousands of volts when the breaker points open and close. 5 ohms; secondary around 6,000–12,000 ohms. (The 10/3 coils have secondary resistance 8. Dec 18, 2025 · -Strengthened ignition coils -Increased secondary voltage! Increases power and improves fuel economy. Jun 22, 2020 · Im a bit confused about the accuracy of the Bentley specs for bench testing a later "green label" Bosch coil. On the ignition side, the cause could be fouled plugs or narrow plug gaps. One key factor in determining the health and efficiency of an ignition coil is its resistance, measured in ohms. This amplified signal turns the ignition primary circuit on and off, inducing high voltage in the secondary coil windings. Secondary voltage will be whatever is needed to overcome system resistance (cap, wires, rotor gap) and jump the plug gap under cylinder pressure. 0ohm, the secondary on one was reading 2MEGAohm, and the other wasn't even reading a connection. 42 k-Ohms for secondary (then 8. Aug 5, 2008 · On August 5th, the #2 coil resistances were 1. May 21, 2020 · 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. Does one impact or affect the input of signal into the coil from the ignition box and the other the output from the coil to the distributor and spark? Higher vs lower ratings better for street vs strip? Just trying to learn and understand what I'm measuring. Is it better to have low primary and secondary resistance? what does it mean to have a low or high primary or secondary resistance? like for May 21, 2025 · If the resistance is too high, it can result in a weak spark. 5k ohms. Nov 27, 2023 · Typically, primary resistance should be low, ranging from 0. For factory-type repair of a lock switch extension coil you may be able to find a swap meet vendor with a coil service package for your car. These come with a full instruction sheet. Technician B says low secondary system voltage output could be the result of high primary ignition circuit resistance. 35 a while later). All the electronic components do is trigger the voltage spike that jumps across the gap. Briggs and Stratton ignition coil resistance chart, detailed resistance values by model with tips on diagnosing and troubleshooting your small engine ignition system Sep 13, 2008 · The DC resistance of a coil is an important specification as it can show whether the coil is open, directly shorted, or if there are low resistance paths within the coil. In the case of a conventional cylinder ignition coil, the electrical connections are designated as terminal 15 (voltage supply), terminal 1 (contact breaker), and terminal 4 (high-voltage connection). Resistance The electric resistance of the primary and secondary windings -- their opposition to the flow of 3 days ago · The ignition coil turns the battery’s low voltage into a high voltage, which ignites the engine’s air and fuel mixture. What will going higher on the secondary do to spark quality/strength? Do the resistances have an effect on spark "timing"? As in when the spark is delivered? What do I not know that I need to know? TIA Jul 31, 2019 · The coils in auto parts stores are more commonly 1. The coil has two internal windings, the primary and the secondary. The ignition coil in an automotive engine is a transformer consisting of two coils, or windings, of insulated wire. Secondary test: Touch one probe to the coil’s output (to spark plug) and the other to the negative terminal. My confusion with it is the Manual says in Step 1: "Disconnect all ignition coil wires (including the spark plug leads) before testing. One key parameter to assess the health of an ignition coil is its resistance. If two coils of wire are placed around each other and current is used to create a magnetic field around one coil (primary winding), it will also surround the second coil (secondary winding). 7K subscribers Subscribed What resistance should I measure across a typical small engine ignition coil? I would have thought down around 50 ohms or less, but I'm measuring up in the Kohms. With a 12 V power source, amps are increasing from 2. So I'm asking if these coil resistances are well documented and well known, to the point of being able to say the 24k secondary reading I'm seeing is not right. 5 - 11. Jun 7, 2018 · The secret to being able to capture and analyze secondary ignition waveforms is understanding what is happening in the coil and at the spark plug, and how the scope measures and graphs the voltages and ignition event. Here, low resistance causes lower-than-normal firing lines. 8 Ohms for primary and 8. Mar 5, 2021 · An ignition coil is basically a transformer (2 coils wound on a common armature so that the magnetic field of the primary winding produces current in the secondary winding). [8] Apr 29, 2014 · 2 ohms mifht work & check points4 any showings of overheating, 3 should fine, this coil resistance is what keeps points life up and keeps down excessice current flow, & the v drop that happens when a resistance is added to any current circuit, remove that resistance and v will increase. 6 Amps to 4 Amps. Who is correct? Tech A While discussing no-start diagnosis with a test spark plug: Technician A says that if a test light flutters at the coil tach terminal but the test spark plug does not fire when connected from the coil secondary wire to ground with the engine cranking, the ignition coil is defective. Click to explore high-quality, direct-fit replacements with fast shipping and verified suppliers. Feb 3, 2010 · To check the ignition coil's secondary resistance, connect an ohmmeter between the companion cylinder coil towers. True While discussing the diagnosis of an EI system, Technician A says the primary coil normally has between 5,000 and 20,000 ohms of resistance. Fig. Are Lawn Mower Ignition Coils Interchangeable Jul 7, 2017 · Would the lower resistance cause some kind of failure? 2. When the ignition is on, and the PCM is energized, the ignition coil control system self-tests will initiate. Nov 11, 2023 · The bike is a 1974 kawasaki H2 750 running a stock CDI ignition. Mismatches can cause weak spark or ECU errors. 5k ohms using a multimeter. 5 to 2 ohms, while secondary resistance should be higher, ranging from 6,000 to 30,000 ohms. Even though it was just slightly below spec, the low resistance WAS IN FACT an indicator that this coil was going bad. 02 ohms. The winding ratio of primary to secondary winding is 1:100. Unfortunately, this test can only provide limited insight into the condition of the ignition coil because the condition of the ignition coil is not measured under load/in operation. g. Units with high-temp epoxy potting or ceramic fillers resist internal breakdown under sustained load. Secondary resistance on the original coil is a little high. Jun 22, 2024 · Ignition coils play a crucial role in the combustion process of internal combustion engines. Jul 22, 2025 · The ignition coil is a crucial component in a vehicle’s ignition system, responsible for generating the high voltage needed to create a spark in the engine’s cylinders. I am concerned with the coil overheating or the ignition point taking too much of a load. Sep 26, 2016 · There are specs printed everywhere for the secondary resistance of an ignition coil but through my books and searching online I can't find anything on primary resistance except for an old thread where mr Pete thought they should be somewhere above 5k. When the ignition is switched on, the coils or coil pack will be supplied with the battery voltage. This is why you need the correct ohm rating for the primary and secondary, depending on the ignition system. The resistance of my old coil which is defective is 4 ohms at those terminals. 4–2 ohms) and secondary (6k–15k ohms) resistance values against manufacturer specs. Who is correct? - A only - B only - Both A and B - Neither A nor B, While testing a spark Jul 27, 2012 · Too bad you already spent the money, batteries aren't cheap. HOW TO TEST A VW BEETLE IGNITION COIL - BEETLE NO SPARK - VW BUS - VW DUNE BUGGY - Pertronix - BOSCH Lawnmower Coil Pack Sparking System - Induction Coil, Transistor! (by Craig Kirkman) 5. This goes for stock ignition systems and modified ignition systems. Secondary resistance should be 8000 4 days ago · Discover how a bad ignition coil can trigger the check engine light, common symptoms, owner experiences, and repair insights. Likely causes are a shorted or low-resistance plug lead or crossfi ing inside the distributor. Generally, the primary resistance is very low, typically less than 1 Ohm, while the secondary resistance is much higher, usually in the kilo-Ohm range (e. 6 ohms. Test primary windings - this is the low tension side of the coil Test secondary windings - this is the high tension side of the coil Test 3 days ago · Testing an ignition coil’s resistance is crucial to ensure it is functioning correctly. I will outline how to measure both primary and secondary resistance using a multimeter. . 5 days ago · Resistance Levels: Low primary and secondary resistance improves efficiency. Sep 25, 2023 · All 3 measure primary resistance 1. Low-voltage current from the battery flows through the primary windings and is transformed into high-voltage current required by spark plugs in the secondary windings. 5–0. Our ignition coils use 100% pure copper windings in the primary and secondary bobbins to improve durability and provide higher resistance to internal shorts and dielectric breakdown May 10, 2008 · My Clymer Manual says when testing my coil the primary resistance should be between 3-5 ohms and the secondary should be between 25,000-45,000 ohms. BUT - the spares measure 11k ohms secondary, but the one on the car measures 24k. They convert low-voltage electrical energy into high-voltage pulses, which ignite the air-fuel mixture in the spark plugs. 5. Resistance Values: Primary resistance should be between 0. Thermal Management: Heat is the enemy of ignition coils. Ignition magnetos were soon used on most cars, for both low voltage systems (which used secondary coils to fire the spark plugs) and high voltage magnetos (which fired the spark plug directly, similar to induction coil ignition). First test cylinder numbers 1 and 2, then cylinders 3 and 4. Ignition Dwell question: I bought a built car off a friend recently and I'm troubleshooting an intermittent ign coil fuse pop, and the ign dwell table as-tuned by the last guy is the only thread left Testing the ignition coil, or rather the Ohmic resistance of the primary & secondary windings of an ignition coil using a multimeter is a classic procedure. If either primary or secondary resistance is outside these ranges, it indicates a faulty ignition coil that requires replacement. If there is no spark, and the coil resistance measures out of spec, that sure seems like a good place to start. Study with Quizlet and memorize flashcards containing terms like What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device? The magnetic field around the primary winding collapses The movement of the magnetic field across the winding induces a high voltage in the secondary winding both "The magnetic field around the primary winding Apr 9, 2020 · Same question on the secondary resistance. Learn how to account for variations in resistance values, ensuring an accurate diagnoses as well as gain insights into recognizing the signs and symptoms of failing ignition coils, helping you Jul 27, 2012 · Too bad you already spent the money, batteries aren't cheap. Step 4: Compare the readings to the resistance chart above. 84-1. Explore the complete ignition coil resistance chart with primary and secondary resistance values for all major brands, from Briggs & Stratton and Honda to Toyota. 5 days ago · Learn what to look for when buying an ignition coil 168F 168FA—compatibility, durability, and performance tips for reliable engine starts. But how many ohms should a good ignition coil have? In this article, we will delve into the world of ignition May 21, 2025 · If the resistance is too high, it can result in a weak spark. The coils primary circuit should have a resistance measurement of 0. 5 days ago · The ignition coil in a Peugeot 406 is a critical component of the engine’s ignition system, responsible for converting the car battery’s low voltage (12V) into thousands of volts needed to create an electric spark in the spark plugs. Jan 31, 2025 · Hi to all, I am modifying a point ignition system using a different coil. Without reliable performance from the ignition coil (s) the vehicle will stumble and misfire. nd short coil oscillations. 5 days ago · When evaluating options for ignition coils for Peugeot 3008 2019, consider the following technical and practical factors: Voltage Output & Resistance Ensure the coil produces sufficient secondary voltage (typically 20,000–40,000 volts). Secondary should be between 8. Plug-and-play fit, copper core winding, stable spark delivery. We also come away with the idea that secondary ignition voltage increases only under “snap-throttle” conditions. Briggs and Stratton ignition coil resistance chart, detailed resistance values by model with tips on diagnosing and troubleshooting your small engine ignition system We would like to show you a description here but the site won’t allow us. Jul 7, 2017 · A coil is said to be saturated when the current has reached it's maximum based on the applied voltage and the DC resistance of the coil. The ignition coil in an automotive engine is a transformer consisting of two coils, or windings, of insulated wire. Who is correct? Neither Technician A says the primary ignition coil can be tested with an Ohmmeter. The Bentley says the resistance between terminal 4 + 15 (secondary) should be 2. Mar 30, 2015 · Discover the inner workings of automotive ignition systems, including coils, inductance, capacitance, saturation, dwell, and secondary testing using an oscilloscope. While testing a coil in an EI ignition system, Technician A says an infinite reading means that the winding has zero resistance and is shorted. But that should be specified as "current saturation". Again, consult the service manual for the correct specifications. Feb 7, 2012 · Today i was looking at some ignition coils, and i noticed that different brands post what the primary and secondary resistances of there coils are. - A secondary circuit: high voltage side connected to the distributor (in older models) or directly to the spark plugs (in coil-on-plug systems). 4-3. What Does P2308 Code Mean? OBD-II Code P2308 is defined as a Ignition Coil "C" Secondary Circuit The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. If your application requires 20,000 volts to do that - 20,000 volts is what you're gonna get. 7 ohm resistance I would make darn sure that your resistance wire has been bypassed and that whatever your ignition trigger might be (you said "Petronix-LIKE") that it will handle the high current. Same scenario as described in question #1, but this time, in addition to the 2. While we're on it - Inductance & Turn Ratio? 4 days ago · To make an informed decision when selecting a Honda SFX ignition, consider the following technical and practical criteria: Coil Resistance: Primary winding should measure around 0. 5 ohm coils so you'd best measure it before buying it, The lower resistance coil will draw more current and run hotter than it should on a 4 or 6 cylinder engine. But if you don't read from the secondary outputs (sparkplug connection) to what ever is the return side on each side of the coils, you are not reading the actual secondary resistance of each circuit in the coil. The engine runs on the original coil, but I seem to be having some problems with idle and starting sometimes. 5 Ohms resistance and the new coil would have a 3 Ohms resistance. Jul 16, 2021 · If your coils resistance is high, there is less amperage passing through the coils and points, which would extend their life, although excessive resistance results in a weak spark, and frequently, misfires. Nov 17, 2012 · Thus the secondary coil circuit (to each plug) on 1985 models had a total of 10K ohms resistance (plug wires = 0, plug caps = 10K, plugs = 0) while the 1986 models had a total of 15K ohms resistance (plug wires = 0, plug caps = 10K, plugs = 5). Highly recommended! It's especially easy to notice at low RPMs when starting off. 5k - 10k). An ignition coil is used in the ignition system of a spark-ignition engine to transform the battery voltage to the much higher voltages required to operate the spark plug (s). 5k–6. Out-of-range readings indicate poor manufacturing or damage 2. Feb 2, 2022 · If you are going to use the low-impedance coil with . ) So my question is: what effect will the lower primary resistance have? Nov 11, 2023 · The bike is a 1974 kawasaki H2 750 running a stock CDI ignition. Oct 11, 2005 · The low-voltage wire from the ignition switch/battery to the coil was sheathed in an armored cable to guard against “hot wiring” of the vehicle. Typically, the ignition coil wiring involves: - A primary circuit: low voltage side connected to the battery and the ignition switch or engine control unit (ECU). 5 ohm Honda coil, I also install one of these GM Delco ignition booster gizmos, as shown in this thread: Jun 23, 2025 · It’s crucial to consult the manufacturer’s specifications for your particular ignition coil. Original coil has a 4. However, too low can overload ignition modules—verify compatibility. The coil contains a primary winding, a slot iron core, and a secondary winding. The ignition coil has a built-in power transistor which amplifies the ignition signal from the ECU. " Sep 13, 2011 · However, doing a low-voltage resistance check does not mean that the coil is OK - you can also have high-voltage breakdown, and this can be determined by doing other testing (which requires an automotive oscilloscope or similar instrument that can measure your ignition system's secondary (or high) voltages). Technician B says the secondary winding in a waste spark (doubled-ended) coil should be checked by connecting the meter across the two secondary terminals. Learn how to test an ignition coil or coil pack on your car, what an ignition coil does, and symptoms of a bad ignition coil with this helpful guide. Study with Quizlet and memorize flashcards containing terms like Technician A says the secondary ignition system is designed to handle high voltages up in the thousands of volts scale. If your reading is too low, the coil may have an internal short; if too high or infinite, the winding may be open or broken. I tested the #2 coil today and the secondary was down at 8. The technical structure may vary depending on the ignition coil's area of application. 8 ohms and a secondary of 4. 09 k-Ohms. 2 ohms, secondary around 8,000–12,000 ohms. There are other ignition components that could be the culprit too, but start with what you know #11 Beezer, Jul 27, 2012 #12 We would like to show you a description here but the site won’t allow us. 5 days ago · When evaluating a 22r ignition module and coil toyota combo, consider the following technical factors: Voltage Output: The coil should produce at least 30,000 volts under load to ensure reliable spark across all cylinders.

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Ignition Coil Secondary Resistance Too Low. This only occurs with diesel engines with spark plug ignition