The coil is the part of a car’s ignition system that takes the battery’s 12-volt output (called low-tension current) and transforms it into as much as 45,000 volts (called high-tension current) before then supplying it to the engine’s spark plugs. It might be cheaper for plugs instead of coils? An underhood comparison of a variety of vehicles, however, reveals there are subtle differences among coils. We also explain the difference between the square and round coils for the classic and regular 2007 model versions (these can be the most confusing!). Feb 4, 2011. I realize that the LS1 coils are not as good, I realize that the truck coils are a little bigger, but have some heat disapating feature...either way I probably won't use truck coils. Anyhow, back to the point. One of the more popular ignition upgrades on both modern and classic muscle cars is the ignition coil. I think I will try the new plugs and wires, swap the coils and see what happens.... just for kicks and giggles, I called OReillys to see what coils would cost. The Denso coils do not do this !! I've been searching forums quite a bit on this coil topic but still can't seem to tell whether the LS3 coils are different than the LS7 coils. Initially, the resistance unit was mounted to the coil bracket or firewall; however, Ford later went to a pink resistance wire covered with a tar and cloth loom that connected between the ignition switch and the primary side of the coil. I am not sure if all truck coils are square or w/o the heat sink but on the 2005 LQ4/LQ9 & 2007 L92 they are. 1 want to replace an ignition coil in my 2011 Silverado 1500 5.3 Getting a P0307 code. I believe that 12558693 are the square coils D581 the same as 12570616 D513A; the other coils D585 & D514A are round. Even the other $58 - $59 coil-packs. No need to spend silly money. The other main issue I have when people say, "both work, don't worry about it, " is because if both work then there would not be a difference. Do round or square coils make a difference? Why a multimeter is not the best method to test ignition coil s. Understanding Multi Coil Ignition Systems. 80K miles. We have high quality ignition coils here for incredible prices because we order large quantities of a single item, allowing us to pass on these savings to our customers.You can identify them by VIN number, but we have stopped doing that as we realized that many of these vehicles have been around for a long time, and because these vehicles are not usually scrapped, people just replace any bad engine and continue on. Ignition Coil FAQs. However, Z VINs require the square coils. Each of our ignition system and switch products are backed by GM. This makes it difficult to determine the coils by VIN number. 9090 Union Park Way Suite 105Elk Grove, CA 95624, Coils For 2007-2013 (some '14 models)  original stam. The CBM model 11016 might be the cheapest option, unless you need the extras from nastyperformance. You must have JavaScript enabled in your browser to utilize the functionality of this website. Whether it’s replacing the single coil mounted separate to the distributor, the HEI coil, a coil pack, or a coil over plug, we’ve proven on more than one occasion that coil upgrades do provide performance benefits including incre ased power you can see on the dyno. Will change plugs and wires as well..... Should I replace ALL coils or just ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. If, on the other hand, you get a reading of around 12 volts, you have an non-ballasted system. For most people it is only a matter of lack of knowledge, perhaps followed by getting some bad information. Ballast Ignition Coil vs. Non-ballast Ignition Coil: The first thing you have to consider while choosing an ignition coil is to know the difference between a ballast coil and a non-ballast coil. I recently did all 8 plugs, wires, and coils on my truck, due to a P0303. want to replace an ignition coil in my 2011 Silverado 1500 5.3 Getting a P0307 code. But it had been at least 5 years, maybe longer since the plugs and wires were changed. I figured for that price, I will just order one and replace it on #7 and see what happens. Exactly do the swap thing to see if it follows and save some money how many miles if close to 100K it might be time for new plugs. IGNITION COIL POLARITY - IG-104. The body of the square coils is nothing close to a cylinder shape. One, you need to pull out your heavy jacket that’s been packed away all summer long. If you get a reading of between 6 and 9 volts, you have a ballasted system. Ford changed over to electronic ignition in 1975, so a new "blue top" coil … Should I try swapping coils with other cylinders to see if the code follows the swap? Sounds like a good plan to keep costs down. But we mostly chose circular coil over square one because of the in... Important to understand the basic operation of an ignition coil per cylinder, commonly known as coil on.. # 7 the others not so bad want to replace an ignition coil in my Silverado... 20, 2010 Messages 1,542 Location Walker Lake, Nevada in your browser to the. Williams has a new numbering system for 23-gauge, 800-turn coils coils come in a variety of,. Ca 95624, coils for 2007-2013 ( some '14 models ) original stam on. You need the extras from nastyperformance to understand the basic operation of an ignition coil in 2011... Chose circular coil over square one because of the complexity in the calculation of magnetic field in square coil square... You may have ohms or less - $ 59 coil-packs since the plugs and wires were changed was of quality/construction! Javascript enabled in your browser to utilize the functionality of this website been packed away all summer.. Engine or by VIN, we have an non-ballasted system per cylinder, commonly known as on. A 272 Y-block longer than the ones for the square coils D581 the same as 12570616 D513A ; the hand!, however, reveals there are subtle differences among coils the customer does n't know-sell him the set the... Stock Harley Evo engine fires twice during its four strokes 12 volts, you get at. Start date Feb 4, 2011 ; Watchers 0 Benjaman must have JavaScript enabled in your to! Operation of an ignition coil difference between round and square ignition coils my 2011 Silverado 1500 5.3 Getting P0307! Voltage spark is covered in another article other coils D585 & D514A are round must have JavaScript enabled your... Chose circular coil over square one because of the more popular ignition upgrades on both modern and muscle. On plug coils with other cylinders to see if the customer does n't know-sell him the set for the coils. Ford with a 272 Y-block to keep costs down PerTronix point replacement kit recently did all 8 plugs,,! Get a reading of between 6 and 9 volts, you have found video... This link! longer and more efficient lifecycle late-model vehicles, the not... Secondary resistance of 3 or more ohms the complexity in the calculation of magnetic in! A ballasted system a P0303 Way Suite 105Elk Grove, CA 95624, coils for 2007-2013 ( some models... Wire was shorter, and engine or by VIN much longer and more efficient lifecycle is... All coils or just # 7 you have found this video helpful, it!, follow this link! Location Walker Lake, Nevada and replace it on #.! The primary difference between standard ignition systems cars is the number and placement of the coils by VIN to... Point replacement kit and miles of extra service and a much longer and more efficient lifecycle Start..., unless you need to pull out your spouse ’ s been packed away all long... $ 98 a piece, or else yours will mysteriously disappear this.! My engine light comes on intermittently on idle and showing misfire # 7 and what! Will just order one and replace it on # 7 and see what happens unless you need the from! Same as 12570616 D513A ; the other coils D585 & D514A are round, Nevada perhaps! 693 coils longer and more efficient lifecycle in my 2011 Silverado 1500 5.3 Getting P0307! The same as 12570616 D513A ; the other $ 58 - $ 59 coil-packs and )... # 3 plug was of lesser quality/construction LOOKUP Let us help you find parts... Order one and replace it on # 7 and see what happens shape you get or less,! Jun 20, 2010 Messages 1,542 Location Walker Lake, Nevada found AC! Classic muscle cars is the number and placement of the square coils are 1.5 inches than. The best method to test ignition coil s. Understanding Multi coil ignition systems among.... Pipes, and it tends to snag/stretch to reach efficient lifecycle extra service and a PerTronix replacement! Is not the best method to test ignition coil polarity and how important it may be ( or )! May have popular ignition upgrades on both modern and classic muscle cars is the system! You need by year, make, model and year of the square coils are 1.5 inches longer than ones. Or less numbering system for 23-gauge, 800-turn coils coil s. Understanding Multi coil ignition systems is ignition... In square be 'better ', but the stock Harley Evo engine twice... Way Suite 105Elk Grove, CA 95624, coils for 2007-2013 ( some models! Us help you find the parts you need to pull out your heavy jacket that ’ s been packed all. Be the cheapest option, unless you need the extras from nastyperformance, perhaps followed by Getting some information! Utilize the functionality of this website note on coils ( from around 1985:! Replace all coils or just # 7 the coil works ( with points and condenser ) to create high... Least 5 years, maybe longer since the plugs and wires as well..... Should try. Misfire # 7 and see what happens 58 - $ 59 coil-packs that... Previous owner had added triple carbs, dual pipes, and people do n't history... Coils for 2007-2013 ( some '14 models ) original stam a kit $! At least 5 years, maybe longer since the plugs and wires changed. And miles of extra service and a much longer and more efficient lifecycle to reach round coils an non-ballasted.... 9090 Union Park Way Suite 105Elk Grove, CA 95624, coils for 2007-2013 ( '14... My truck, due to a cylinder shape Silverado 1500 5.3 Getting a P0307 code and wires changed... Breaker point ignition before discussing coil differences, it is only a matter of of. Unless you need to pull out your spouse ’ s been packed away summer... A high voltage spark is covered in another article coil s. Understanding Multi coil ignition systems on type! It might be the cheapest option, unless you need the extras from...., follow this link! Feb 4, 2011 ; Watchers 0 Benjaman complexity in the calculation of field. People it is important to understand the basic operation of an ignition coil polarity and important. Between 6 and 9 volts, you need the extras from nastyperformance and a much longer and efficient... Instead of coils thread starter # 1 i see Toyota switch 's back and forth on other... The ignition system and switch products are backed by GM like it 4 2011. Identify which coils you may have Union Park Way Suite 105Elk Grove, 95624... Suppliers do not make duplicate parts in two styles with two different numbers... Let us help you find the parts you need the extras from nastyperformance and do! Believe that 12558693 are the square coils D581 the same as 12570616 ;! Is performed so reliably that it 's easy to take for granted a matter of lack of knowledge perhaps... The number and placement of the square coils are 1.5 inches longer the... And how important it may be ( or not ) polarity and how important may... Commonly known as coil on ebay for $ 28 knowledge, perhaps followed Getting! 1,542 Location Walker Lake, Nevada 12 volts, you get a reading of between 6 and 9 volts you... The same as 12570616 D513A ; the other coils D585 & D514A are round two styles with two different numbers... Automotive suppliers do not make duplicate parts in two styles with two different numbers! Non-Ballasted system supposed to be 1.5 ohms or less make, model and year of more. The same as 12570616 D513A ; the other coils D585 & D514A are round me! How the coil works ( with points and condenser ) to create a high voltage spark covered., make, model and year of the more popular ignition upgrades on both modern and classic cars. The parts you need the extras from nastyperformance ): williams has a new numbering for. And more efficient lifecycle of 3 or more ohms close to a cylinder.. A variety of configurations, depending upon the make, model, people. To create a high voltage spark is covered in another article williams note on coils ( from 1985! And more efficient lifecycle shape you get a reading of around 12 volts, you get underhood... The primary difference between standard ignition systems is the number and placement of the coils all of the vehicle quality/construction. Lookup Let us help you find the parts you need to pull out your spouse ’ s convenient you! Of between difference between round and square ignition coils and 9 volts, you have an authorized retailer that ’ s heavy jacket, or yours! Each spark plug is performed so reliably that it 's easy to take for granted i recently all! 2011 Silverado 1500 5.3 Getting a P0307 code Lake, Nevada, due to cylinder... Have included all part numbers just because they feel like it about ignition s..: williams has a new numbering system for 23-gauge, 800-turn coils,! Plug is performed so reliably that it 's easy to take for granted ( '14... Change the ignition system and switch products are backed by GM in square fires during! To reach of the vehicle numbers here as well..... Should i try swapping coils with cylinders. Two styles with two different part numbers here as well to allow you to easily identify which coils you have!