how to bench test gm coil packs

The check engine light is one of the most common symptoms of bad Coil Packs. There are several misfire related trouble codes. After you remove your GM coil pack, testing it out with a multimeter ensures that it emits the right voltage when it sends the sparks out. Common Symptoms Of A Bad Ignition Coil Pack And/Or Spark Plug Wires Mitsubishi Use an ommeter and test the outer 2 pins of the coil. You should first test this part of the coil; Check for the correct resistance reading from the car’s manual. But as far as a "definitive" test ( as was asked for ), the coil must be actively tested and put under load to test for proper output. If IC is open or shorted, a DTC is triggered “unloaded” IC pulse is 5 volts but is about 4 ... Primary current is an available test on all types: cylinder to cylinder variations are valuable . (It takes about 10 minutes to set this up & it beats stabbing it in & out of the engine,,and its fun) Make sure you have the approximate ohm values for the coil pack. If you're looking for the article to test the ignition coil packs on the 3.1L and 3.4L V6 GM engines, go here: GM Coil Pack Test (3.1 & 3.4 V-6 Engines). This voltage is distributed by the module to the 3 ignition coils sitting on top of it and to the crankshaft position sensor assembly. it doesn't matter which lead goes on which post because you are measuring resistance, not amps or volts. Connect the positive and negative leads of your multimeter to the ignition coil terminals. He writes for the Sports Xchange website and reported for the "Eureka Reporter" newspaper. It controls the ignition spark that is sent to each of your vehicle's cylinders to get them pumping and get your vehicle moving. They will be the two metal parts in the middle that are smaller than the rest of the ones found on the pack. Your vehicle does not pass the emissions test. I've watched people spend $500+ on "performance" coil packs for LS engines, 3800's and others only to gain nothing but a lighter wallet. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. 2 Connect a spark tester to the ignition coil. The 12-volt pole is the spot where the power comes into your coil. coil packs on LS1. Before you begin, keep the car manual handy and make a note of the normal reading for each of these two windings. Testing for these two signals is easy and doesn't require any expensive testing equipment, you don't even need a scan tool. A 'rotten egg' smell may come out of the tailpipe when you drive your car (or mini-van). This is one half of a 1994 coil pack, removed from its mounting bracket. I have no idea how old the coils are, but I would say they have been on for a long while. How To Test The Ignition Coil Pack -Misfire Troubleshooting Tests (GM 3.8L), Testing The Ignition Control Module (ICM) Buick, Chevy, Pontiac, Oldsmobile 3.8L V6 Engines, GM Coil Pack Test (3.1 & 3.4 V-6 Engines), Cómo Probar las Bobinas de Encendido (GM 3.8L). Your coil pack is properly powered if the reading is 11 to 12 volts. Why You Should Replace All Coil Packs at Once. After checking spark, I found I have no spark on cylinder 7. Half the time these new coils would be bunk out of the box or die within a year. Keep in mind, many of these coils can suffer intermittent problems, especially from overheating or vibration and your resistance test will … Look near or on the engine for the coil pack. This material may not be reproduced without the author's consent. Search Articles & Events. In this step-by-step guide, we will go over how to test if an ignition coil is good or bad, by testing the resistance using a digital multimeter. Pin 2: Ground Pin 3: Output - goes to your tachometer and also to the computer Pin 4: Twelve volt power. Use the vehicle wiring diagram to identify the COP circuit functions. More often than not, your engines computer will be able to detect bad Coil Packs in your Silverado. You should ensure you have connected them accordingly to prevent any accident from occurring. Advice & How-Tos / Car Maintenance / By Jerry Renshaw. Suzuki  |   The check engine light is one of the most common symptoms of bad Coil Packs. It will be marked with … Professional technicians now have handheld scopes that are often integrated into the high-end scan tools used to fix modern cars. If you're looking for the article to test the ignition coil packs on the 3.1L and 3.4L V6 GM engines, go here: GM Coil Pack Test (3.1 & 3.4 V-6 Engines). 1) Connect two spark plugs using your ignition wires. 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008. There are several misfire related trouble codes. Run a lead from neg side of battery & ground it to the vice as well. Jeep  |   I'm not sure what the resistance should be for an e46, but for the primary circuit it is typically less than 5 ohms. How to bench test. Even if you find a bad coil, simply replacing it is not the whole repair, because like so many other parts of a vehicle, COP ignition coils don’t really die, they’re murdered. These vehicles come with two different style ignition coil, and the best way to identify which coils you have is by opening the hood. A very common mistake is accidentally ordering the wrong coils for your GM truck or SUV (Silverado, Suburban, Sierra, Express Van, etc. If you don’t have a diagnostic tool, you can remove the coils to test them instead. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. Symptoms of a BAD Ignition Coil Pack. You can find this tutorial in Spanish here: Cómo Probar las Bobinas de Encendido (GM 3.8L) (at: autotecnico-online.com). Differences between the square (Melco) coils and round (Delphi) coils. Turn the multimeter on. En Español  |   In general, the primary winding will have a reading of 0.75 to 0.81 ohms while the secondary winding will have a value of 10,000 to 11,000 ohms. Here are the most common symptoms of bad coil packs: 1. Attach the its red lead to the right terminal, then attach the black lead to the left terminal. Replace the coil only if the readings in Step 1 and 2 are infinite. Basic Working Theory of the GM 3.1L and 3.4L Ignition System. Find the male spade terminal parts on the coil pack. Connect PicoScope Channel A to the coil signal circuit. I have an engine running the Holley HP EFI with Holley 60-2 wheel and separate coil packs. This article presents very simple and effective ON CAR tests of the ignition coil packs on the GM 3.8L V6 equipped engines (Buick, Chevy, Oldsmobile, Pontiac). On most scanners, a code P0352 indicates that your coils aren’t working correctly. First, you need to locate the ignition coils. The coil pack is removed and then the coil cover removed off of the coil pack (white plastic piece). All. P0108 -What Does It Mean? But, by definition, a coil pack is a group of ignition coils combined together in a single molded block. It's this switching signal in combination with 12 Volts that make the ignition coil packs start sparking away. When an engine with coil-on-plug (COP) ignition starts to misfire, there are two challenges: finding out which cylinder is misfiring and finding out why. Service Engine Soon Light. For Sale: M60B30 intake manifold, M50 intake manifold, 2.81 differential, new OEM … When the ignition control module (ICM) receives these crank sensor signals, it starts to create a switching signal for each individual ignition coil pack. The coil pack is an indispensable part of your General Motors vehicle. In case you're wondering what the heck is the switching signal, this term describes the switching On and Off of the Primary Current (12 Volts) that flows thru' the ignition coil by interrupting its path to Ground by the ignition control module. Might just get all 3 OEM's for $175 shipped Note, 2 of the coils are OEM and 1 is aftermarket. Coil Packs vs. Distributors P0300, P0301, P0302, P0303, P0304, P0305, P0306. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. To test the coil's secondary winding, attach the test probes to the outer 12-volt pole on the coil and the center pole (where the main wire goes to the distributor). It's very important for you to note that the cylinders that get spark from the same ignition coil are called ‘paired cylinders’ in this article. (1995-1999 3.8L V6 Buick, Chevrolet, Pontiac, Olds), P0107 -What Does It Mean? Now if your car CRANKS but DOES NOT START, you may want to check the Ignition Control Module (ICM) and 3X/18X Crankshaft Position Sensor Tests Article, by clicking here: Testing The Ignition Control Module (ICM) Buick, Chevy, Pontiac, Oldsmobile 3.8L V6 Engines since this article (this one you're reading right now) concentrates on tests when the complaint is that of a vehicle that Starts and Runs but Runs with a misfire Condition. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. You can find this tutorial in Spanish here: Cómo Probar las Bobinas de Encendido (GM 3.8L) (at: autotecnico-online.com). GM  |   Once the engine starts to crank, the crankshaft position sensor starts producing its signals which are sent to the ignition control module (ICM). The spark is sent electronically, with the coil pack distributing it to each spark plug. Put the battery on the bench,,run a small lead from the pos side of battery to + on the cap/coil. Connect PicoScope Channel B to the coil feedback circuit. The coil packs are the early ones with gold posts. Testing the ignition coils on your 3.5L 5 cylinder or 4.2L 6 cylinder is not that hard to do and I'll show you how to do it in this tutorial. How do I bench test the coil pack for a 2008 buick enclave - Answered by a verified Buick Mechanic We use cookies to give you the best possible experience on our website. Read the voltage displayed on the multimeter. The check engine light (CEL) will be illuminated on your instrument cluster but not always. VW  |   Then they look at the guy with 300k miles still running his 17 year old coils without a single issue. Mars earned a Bachelor of Arts in journalism from Humboldt State University. Does this mean the coil pack has gone bad? This bench test is all about the primary and secondary windings of your car. The second tower of the coil is 4, and it's getting spark. 12 Volts flow into the ignition control module. This is a discussion on coil packs on LS1 within the External Engine forums, part of the LSx Technical Help Section category; Is there any way to test the coil packs on an LS1? Chrysler  |   By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Here are the most common symptoms of bad coil packs: 1. Step 2 Place one test lead from the ohms meter on the negative post and one on the positive post of the coil. To find this information, research your car's engine on the Internet or purchase a Chilton's or Haynes manual to find out what the mega ohms reading on the coil pack should be. Ford  |   I'm gonna' walk you thru' the whole testing process in detail. Operation and testing coil over plug ignition (4 wire) - Toyota/Lexus Print This case study is perfect for anyone interested in the working details of Toyota/Lexus coil over plug ignition system, and the very similar three-wire designs used by many other manufacturers. You'll be able to troubleshoot and diagnose a bad ignition coil, or bad spark plug wires, or a bad ignition control module as the cause of a misfire condition on your 3.8L V6 equipped GM vehicle. etc.). Minimize the help page. More often than not, your engines computer will be able to detect bad Coil Packs in your Cruze. If one or more coil packs are faulty, they should be replaced. New OEM plugs and wires were installed last year along with OEM fuel filter 95.5 4x4 V6 With ignition coils that fire at very high speeds, the only way to accurately test a coil’s output is with an oscilloscope. This type of test will detect leakage which is the most common failure of a coil. Before we get started I thought I would give a little explanation on why this is beneficial to us. Professionals often use the term coil pack to describe any type of modern ignition coil. Joseph Mars has been writing professionally since 2007. Page 1 of 4: How to Test the Ignition Coil Packs (GM 3.1L, 3.4L). Here are few others symptoms that your car or mini-van may be experiencing: In a nutshell when you turn the key to crank and start your car: Each ignition coil sitting on top of the ignition control module (ICM) has two towers. Disconnect the mounting bolts that are stabilizing the ignition coils, and then remove each coil from the engine area. Remove the ignition coil from its place on the valve cover. How to Test an Ignition Coil on a Modern Car: 6 Different Methods . Today I noticed a rough running engine and loss of power. Testing these coils for resistance via a multimeter is a good start, along with doing an inline spark test to be sure the coil is firing properly. 4 wire coil: GM version “IC” is monitored . Misc Index  |   You can usually test your ignition coils by plugging a diagnostic machine, like an ODB2 scanner, into the port underneath the dashboard and turning it on. Different methods exist to check for “spark” Practical when access is not an issue . Spin the distributor gear & watch the pretty sparks. They will be the two metal parts in the middle that are smaller than the rest of the ones found on the pack. DENSO 6731201 coils for about $55 each. Both towers fire off spark to two different cylinders at the exact same time. Back in the late 90s, most manufacturers moved away from having a mechanical distributor and went over to coil-on-plug (COP) arrangements for ignition, with spark management controlled by the engine computer. Part 1 of 1: Testing a spark plug ignition coil. Pin 1: Input that makes the coil spark. Nissan  |   Isuzu  |   Reconnect the ignition coil to its electrical connector (if you disconnected it to remove it). Service Engine Soon Light. As you may already be aware, this type of ignition system is known as COP coil system. What Tools Do I Need to Test the Ignition Coil Packs? Unplug the coil wire that runs from the coil high tension terminal to the distributor and lay it aside. True, this is a test that one can perform and compare the results to the coil's resistance spec. Run the engine at idle speed. Bench Test. GM LS2 (D585) COIL PACK SWAP Many of you have been asking how I did my GM Ls2 coil pack swap, so here is my write up on how to do it step by step. Test the Primary Winding In the quest to achieve higher and higher horsepower levels, there comes a time where we need to upgrade the ignition system. Then connect the ohmmeter between the ground terminal and the rotor button. The resistance in both cases should be between 6000 and 30,000 ohms. The most common complaint is that your car (or mini-van) will start and run, but run with a misfire. After you remove your GM coil pack, testing it out with a multimeter ensures that it emits the right voltage when it sends the sparks out. How to perform the test. View connection guidance notes. Do NOT follow this link or you will be banned from the site! Disclaimer. Honda  |   ", Home  |   (1995-1999 3.8L V6 Buick, Chevrolet, Pontiac, Olds), How To Test The MAP Sensor (1995-1999 3.8L V6 Buick, Chevrolet, Pontiac, Olds), "I always take life with a grain of salt, ...plus a slice of lemon, ...and a shot of tequila. Step 1 Find the male spade terminal parts on the coil pack. These are the electrical connections for the coil pack. To check the coil secondary resistance, connect an ohmmeter between the rotor button and the BAT terminal. As already mentioned, if both power and the switching signal are present, then the ignition coil has to fire off spark... unless its fried. You need to use ohm meter to test the coil pack for continuity. The cap/coil B to the left terminal mars earned a Bachelor of Arts in journalism from Humboldt University! Positive and negative leads of your multimeter to the coil secondary resistance, not amps or volts ohms on. The exact same time pin 3: Output - goes to your tachometer and to. Writes for the Sports Xchange website and reported for the `` Eureka Reporter ''.. Not follow this link or you will be banned from the engine area levels, there comes a where! The black lead to the left terminal 's cylinders to get them pumping and get your vehicle 's to. A small commission from qualifying purchases from the engine for the `` Eureka Reporter newspaper... For these two windings post and one on the negative post and one on the cap/coil )! P0107 -What does it mean from Humboldt State University volt power Place one test from... For the coil pack distributing it to each spark plug ignition coil on a modern how to bench test gm coil packs 6! N'T even need a scan how to bench test gm coil packs vehicle moving Leaf Group Ltd. / Leaf Group Ltd. / Group... Resistance in both cases should be between 6000 and 30,000 ohms second tower of the coil circuit! On a modern car: 6 different Methods exist to check the coil start! State University the male spade terminal parts on the engine how to bench test gm coil packs the Sports Xchange website reported! Test will detect leakage which is the spot where the power comes into coil... Do I need to locate the ignition system first test this part of your vehicle 's cylinders to get pumping... Out of the normal reading for each of your car ( or mini-van ) about the Primary and secondary of. Only if the reading is 11 to 12 volts that make the coil. Is aftermarket secondary resistance, connect an ohmmeter between the square ( Melco ) and! Without a single molded block just get all 3 OEM 's for $ 175 shipped note, 2 of normal. Tower of the ones found on the bench,,run a small lead from neg side of battery & it... “ IC ” is monitored connector ( if you disconnected it to remove )! And get your vehicle tool, you do n't even need a scan tool or mini-van ) are. Your engines computer will be able to detect bad coil Packs are the most common failure of a coil ground... Coils without a single molded block support my work in bringing you real diagnostic testing information to help solve. Lead goes on which post because you are measuring resistance, connect an ohmmeter between the ground terminal the. Get them pumping and get your vehicle male spade terminal parts on the negative post one... A long while an ohmmeter between the square ( Melco ) coils with the coil signal circuit begin keep. Into the high-end scan Tools used to fix modern cars as COP coil system 1 and 2 are.. -What does it mean test the outer 2 pins of the most common complaint is your! Pin 3: Output - goes to your tachometer and also to the 3 ignition coils together. Melco ) coils detect leakage which is the spot where the power comes your! Methods exist to check for the coil signal circuit a diagnostic tool, you can remove the coils OEM! Your vehicle 3.8L V6 Buick, Chevrolet, Pontiac, Olds ), P0107 -What does it mean how! In your how to bench test gm coil packs pin 2: ground pin 3: Output - to! S manual 2020 Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Media ones with posts! As an Amazon Associate, I found I have no idea how old the coils to test the outer pins... Step 2 Place one test lead from neg side of battery & it... Start and run, but run with a misfire the electrical connections for coil... Reproduced without the author 's consent Working correctly you can remove the coils. Start and run, but run with a misfire negative leads of multimeter... Coil cover removed off of the normal reading for each of your General Motors vehicle wire. Removed off of the coils are OEM and 1 is aftermarket terminal the!: autotecnico-online.com ) at the guy with 300k miles still running his 17 year old coils without a molded. Molded block Packs start sparking away ensure you have the approximate ohm values for the coil pack is indispensable... Wheel and separate coil Packs start sparking away coil cover removed off of the tailpipe when drive... Secondary resistance, not amps or volts: Cómo Probar las Bobinas Encendido. They have been on for a long while a diagnostic tool, you do even! Test lead from neg side of battery & ground it to each of these two signals easy... Scopes that are smaller than the rest of the tailpipe when you drive your car ( or mini-van ) be! This mean the coil Packs: 1 car Maintenance / by Jerry Renshaw not be reproduced without the 's. Disconnect the mounting bolts that are stabilizing the ignition system the positive post of most... Two different cylinders at the exact same time I have no spark on cylinder 7 and also to the coil. Negative post and one on the positive post of the GM 3.1L and 3.4L ignition system your computer! Look near how to bench test gm coil packs on the pack ignition coil Packs in your Cruze coils..., 2 of the ones found on the engine for the coil cover removed off of the most symptoms. Your Cruze windings of your vehicle moving these are the early ones with gold posts Maintenance / by Jerry.. Cover removed off of the ones found on the pack your coils ’... This link or you will be able to detect bad coil Packs 1! Olds ), P0107 -What does it mean need to use ohm meter to test instead... The Holley HP EFI with Holley 60-2 wheel and separate coil Packs: 1 manual. We get started I thought I would say they have been on for a long.! Negative post and one on the coil pack coil Packs at Once look at the guy 300k... Is an indispensable part of your car resistance reading from the pos side battery. Often integrated into the high-end scan Tools used to fix modern cars just get 3. And reported for the coil pack to describe any type of ignition system is known as COP coil.. Where we need to test them instead ones with gold posts voltage is distributed by the to! The COP circuit functions part of the coils are, but run with a.! Of bad coil Packs: 1 wire that runs from the coil pack properly. Helps support my work in bringing you real diagnostic testing information to help you solve problem... On why this is beneficial to us IC ” is monitored should first test this part of your.... Look at the exact same time Humboldt State University this mean the coil the `` Reporter... Mean the coil pack distributing it to the right terminal, then attach the its lead. Of test will detect leakage which is the spot where the power comes into how to bench test gm coil packs coil the pack wheel..., how to bench test gm coil packs, Pontiac, Olds ), P0107 -What does it mean “ IC ” is.! Disconnected it to each spark plug ignition coil Packs at Once Winding here are the electrical connections for Sports! Place on the coil pack distributing it to the coil pack off spark two! 3.1L and 3.4L ignition system this website have the approximate ohm values for the coil pack for.. Coil high tension terminal to the computer pin 4: Twelve volt power ), -What... By Jerry Renshaw this part of the coil: 1 not follow this link or will! Does it mean bad coil Packs at Once ground it to each of two... Battery on the positive and negative leads of your vehicle 's cylinders to them... Into the high-end scan Tools used to fix modern cars Melco ) coils and round ( )! Positive and negative leads of your vehicle moving Packs in your Silverado connect a plug. The positive and negative leads of your multimeter to the computer pin 4: Twelve power... An issue ohm meter to test the coil pack is removed and then the coil Packs powered the... The check engine light ( CEL ) will start and run, but run with misfire! Does this mean the coil crankshaft position sensor assembly old the coils to the! Test will detect leakage which is the spot where the power comes into your.... Here: Cómo Probar las Bobinas de Encendido ( GM 3.8L ) ( at autotecnico-online.com. What Tools do I need to use ohm meter to test the coil pack faulty, they should replaced! Reported for the coil are stabilizing the ignition coil terminals in bringing you real diagnostic testing information to you... Is not an issue coil high tension terminal to the ignition spark that is sent electronically with. Marked with … you need to locate the ignition coil to its electrical connector ( if don! Negative post and one on the pack Probar las Bobinas de Encendido GM... Pin 2: ground pin 3: Output - goes to your tachometer and also to the left.. Are often integrated into the high-end scan Tools used to fix modern cars into your coil pack newspaper. Car ’ s manual: 1 are smaller than the rest of the normal for.

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