hei coil failure symptoms

Engine Misfire. Newer vehicles use either coil-on-plug (COP) ignition coils or coil packs. Weak Spark. This is unlike a remote coil that doesn't need to be grounded. I'm not a member, so I can't see the photo you attached. Second- You are driving, the car shuts off. new spark plugs in it too. Got any recommendations? I also had found at least an oz of oil in the dist. From my memory, the large cap HEI's need that ground strap to run, they won't run at all unless it is in place, and not compromised by dirt/corrosion. wiggled wires around and there was no change. This low voltage could be insufficient to get the distributor to fire. When hot they quit then some of the time after they cool will work again. Older rotors were made form lower quality plastics and can transmit spark through them, increasing resistance and heat, failure. No more problem. The most common sign of a bad coil is the car just shutting off when driving. Now I know why my engine went out like like a light switch while cruising down the highway. put new module in it. Make sure you have a ground strap running from the engine to the firewall and one from the engine to the frame. But when I try to start it no spark is going to the plugs. Sep 1, 2001. The most common of the bunch is the ever reliable GM HEI internal cap. Hard Starting. wouldn't start back up. USUALLY, switching coils, in search of better ignition or higher secondary voltage will result in a component failure over time. Then it starts doing that all over again. As the ignition coils are among the ignition system's most vital components, an issue can cause spark to be compromised, which can quickly lead to performance issues. Any reduction in fuel economy can indicate the electronic spark timing (EST) in the HEI control system has failed. I don't know if it applies here , but an old timer told me not to leave the vehicle turned on without it running . Limp home, replace HEI coil (tried Echlin, AC Delco, etc.) What happens if there is no voltage in the HEI distributor? 82 gmc will runs fine, won't start after you shut it down. The coil ground path should already be from coil to distributor body to engine to negative battery cable to battery negative post, no diversions form that path. DIS ignition systems are much better in terms of reliability with less moving parts to fail however there is still a handful of us that cling onto old school distributors. Roughen the contact area of the clamp with a few hacksaw blade cuts or coarse file so that good contact is made. Also make sure the intake manifold bolts make good contact with the intake, no fibre washers under the bolt heads because the ground return extends from the intake-head -block. Just a thought. Maybe you have a bad connection and that R&Ring the coil moves something that gets it working again for a while. Automobile engines run maintaining sequences. cap head. There are three wires that exit the side of the distributor, and plug into the bottom of the cap. Jeff Smith Writer. Weak Spark. HEI's need 12V power you can't use a Resistor or Resistor wire. Found something that may or may not have been a problem. If the positive hot wire from the battery that feeds the distributor has no voltage to it, the HEI distributor will not function. Reduced Fuel Economy. Do you need a coil with an HEI distributor? With its well documented project builds, technical articles, factory specifications, photo gallery, classifieds, active message forum, product reviews and original automotive content it's an unbeatable source. Electrical Arc and Shorts. Did you ohm-out the bad coils? You pull over, try to start it but it doesn't fire. I have been out of the daily grind of being a mechanic for 20 years and out of auto parts for 15. make sure the rotor isn't loose and that Hard Starting. It just cuts off but immediately starts right back up. Aug 24, 2014. Plugs gapped at .045 Symptoms: Gradual power drop off, at 2800 RPM plus it turns to "spark blow out". I didn't screw around with trying to fix the thing, just bought one of these 49 dollar job's from KMA performance with 65K V coil. Could also be the pick up coil--often they fail only intermittently,after the engine warms up and gets hot..then after it cools off it will start and run again,at least for awhile--sometimes days,before acting up again!..can be a real butt pain to diagnose,since many other causes have similar symptoms,like corroded wiring for example. The key functions for the HEI module are to set the current limits for the ignition and establish the dwell circuitry. A control module and magnetic pickup are mounted in the distributor, in place of a conventional ignition systems breaker points and condenser. What happens when the ignition control module goes bad? I remember that the in cap coils also have a ground strap that goes to another one of the coil hold down screws in the cap. Did this test and found my problem. For a better experience, please enable JavaScript in your browser before proceeding. Rechecked for loose grounds. I put maybe 100 miles on it or so, and one day it stalled, and wouldn't start. I have a 86 k10 with HEI and it started one day and the choke would not kick off hit the gas pedal to try to make it cut off and it died. I thought, great! He said it nots good for the points/module/etc . We recommend converting to an electronic ignition on a musclecar engine over a point-type ignition system for several reasons. turn the rotor by hand and let it go, does it snap back? The starter will crank the engine but there will be no fire coming from any of the spark plug wires or spark plugs. I can't figure it out for some reason. The lack of a ground strap will cause the coils to burn out in short time. What does an HEI module do? It also results in violent vibrations and jerking motions. Take the cap off and then take off the rotor. I've had four coil failures this summer - three in the past week. Make sure to get a quality oil filled (not epoxy) coil . The distributor is grounded through the dist clamp and the gear drive. Motorcycle Ignition Coil Failure Symptoms are-. If that doesn't fix the problem, check ebay. gm hei ignition module failure symptoms. It requires minimal wiring and is easy to install. I am told this could be a weak pickup coil. Engine Fails to Start. Opening the coil's circuit causes that field to collapse, resulting in tens of thousands of volts being induced in the coil's secondary windings. Milton (and David) thanks for the refresher and update! Ignition coil failures result in 1 or more spark plugs not receiving the appropriate amount of charge. The HEI system controls the spark timing changes for the engine, which regulates emissions, engine performance and fuel economy. No money required! [3] I would disconnect the tach for a while. Testing the secondary circuit of the coil. Smog Check Failure. There is a gasket between the bdy and intake to seal oil leakage. Mostbut not allHEI systems have the ignition coil mounted in the distributor cap. A faulty ignition module can affect ignition timing, resulting in an engine that misfires and runs rough. And I metered the harness that connects to the distributor and that was good. See all 12 photos. Just to make sure sprayed down with terminal cleaner. gm hei ignition module failure symptoms. MSD sells a cap to mount an external coil. I replaced the distributor cap and coil again last Saturday. Replacement process: Check cap, check rotor, check bushing. Since then it has grown to be a leader among full size Chevrolet K5 Blazer and GMC Jimmy web sites across the Internet. How to Market Your Business with Webinars? 1 What are the symptoms of a bad HEI coil? September 29, 2022 . Using the multi-meter set on the ohms setting, touch the positive lead to the red wire terminal and the negative lead to the yellow wire terminal. There are three stages that i have found of this: First- You are driving, the car shuts off. The bushings go bad and the coil wears into the housing causing a short and in effect a no start situation. JavaScript is disabled. Testing an HEI or High Energy Ignition Coil with an Ohm Meter The common denominator in the issue would seem to be the plug wires. Reduced Fuel Economy. You pull over, turn the key and it fires right up and you drive home. The in cap coils create ALOT of heat and are very tough on the modules, wiring, etc. Whether it's engine overheating or ignition coil overheating, whenever you notice that one component on your car overheating, you should act fast. JavaScript is disabled. The first was coming back from Belton. They run between the distributor and spark plugs. could be a faulty ignition module. For your immediate issue, simply substitute a known "good" coil, the one that you now have. I had forgotten about the ground strap in the middle terminal and the grief it can cause when missing. It produces sputtering and coughs like sounds when you try to start it. An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. For a better experience, please enable JavaScript in your browser before proceeding. I'd appreciate any feed back. Signs & Symptoms of a Bad Magnet Pick Up HEI Distributor. gm hei ignition module failure symptoms By knitter's pride smart stix 2, 2022 real witches cauldron By knitter's pride smart stix 2, 2022 real witches cauldron 4. OH remember new DON'T mean good.The work or not also applies to the module.Good luck. Long story short, car has been running Pertronix Ignitor I and Flamethrower oil-filled 1.5 ohm resistance coil since '05 and using OEM resistor wire from ignition switch to coil, had first Flamethrower coil go out on me late August '07 going into Goodguys MidAmerica Nats, swapped it out with chrome-plated version and didn't have problems until now. Jon N. ~ The person who doesn't listen to the media is the best informed. Smog Check Failure. How does the HEI system affect fuel economy? DIS ignition systems are much better in terms of reliability with less moving parts to fail however there is still a handful of us that cling onto old school distributors. Bad HEI ignition distributors give off some warning signs that can be diagnosed by the vehicle owner. New GM crate with GM distributor died after about 1000 miles. Swapped it with another coil. Jun 5, 2011. First Generation Camaro Info and Tech - 1967-1969, The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. It is usually the first thing to go in an HEI. If you do they wont operate properly = weak or no spark. HEI internal coil failures are pretty common. Dirty, increased resistance, failure, or, no contact, coil won't fire. Engine Fails to Start. Bad HEI ignition distributors give off some warning signs that can be diagnosed by the vehicle owner. make sure you have a ground strap under the cap where the coil is. The engine is the ground for the module and coil, and, the engine should have a direct negative large gage wire, called a battery ground wire, directly to the negative post on the battery, so, no extra ground straps should be needed. 6 How can I tell if my HEI system is failing? This system works in conjunction with the vehicles computer, and will announce a failure via a trouble code light on the dashboard. Also, HEIs allow full alternator voltage to go through the ignition system, which with our 50,000-volt coil allows larger plug gaps for better combustion and more power. Make sure they are in and secure. I don't know what you mean by "spark blow out" exactly, but I'll reply to what I think you mean as a weak spark misfire. Plug Wire Engine Miss. What are the symptoms of a bad HEI coil? Maybe one of them is a ground? Why is the Definition of done so important to an agile team? Artificial Intelligence is no match for Natural Stupidity. 29. Do you have the ground strap on the coil???? got it to start today running like shit. https://mrcheckout.com/wp-content/uploads/2017/01/Profile.jpg, HOW TO : GM HEI Distributor Pick-up coil troubleshooting. In most cases, it is seen a worn-out ignition coil is creating issues like engine misfiring. 5 How does the HEI system affect fuel economy? But even these fail from time to time. I would start with the module. :thumbup: A forum community dedicated to hot rod owners and enthusiasts. make sure the cap isn't cracked. Again, I checked for spark at the plug, and there wasn't any. One thing I found years ago when the HEI was first being used was that the wires coming out of the pole piece would work loose and when things turned they would cut in and out. I have not seen a coil give this kind of trouble they usually work or not. The Latest In Performance HEI Coils And Modules. The engine may also run well at low speed, but wont accelerate well. I dropped it in and I'm not getting any spark from the spark plug wires I metered the coil when I turn the ignition forward and it has power going to it. The Latest Innovations That Are Driving The Vehicle Industry Forward. When I got it, it wouldn't start, so I checked for spark at the plugs, there wasn't any. When the ignition coil fails, the car starts but won't stay running. In addition to a good heat transfer paste (NOT dielectric grease), you really need to get rid of the in cap coil. It starts losing power/backfires, dies, then will start back up and act fine (after a cool down time) until a few minutes later when its built up heat again. What I didn't expect to find was this after a random no-start on my old pickup this morning. I put in a used coil I had laying around, and it fired right up. make sure the centrifugal advance is operating correctly. Ran fine the other. 3. But without an external coil, a stock HEI cannot provide a strong spark at rpm levels commonly seen on the racetrack. Matthew Hussey | The Psychology of Entrepreneurship, Epic 80s Entrepreneur Training Video Grasshopper.com. New coil, cap, rotor, plugs. Good luck! HEI coils have a grounding bar under them, goes from the coil yoke to the center terminal of the 3 wire connector, and to distributor ground. I have a 89 Chevy truck with a 5.7L engine. Take care and peace out:-), Your email address will not be published. it now just cranks and acts like it wants to start but doesn't any help would be greatlyappreciated. Check alternator output 14.3 volts. So, you must be very careful about it. The HEI system controls the spark timing changes for the engine, which regulates emissions, engine performance and fuel economy. Put a different distributor in (used)before these issues. Electrical Arc and Shorts. There are three wires that exit the side of the distributor, and plug into the bottom of the cap. one time when my truck had points i decided to leave the radio on and the points fried, tried replacing them and it was easyer to go to HEI and it runs better and i can jam to the radio now!! Stalling: A failing ignition module can occasionally prevent the engine from getting spark, causing it to stall. The coil failed in my 350 but I didn't find it untill I tried another mudule with no success. Testing the pickup. ACCEL, Pertronix, MSD, Performance Distributors, and several others offer performance versions . Maybe one of them is a ground? JavaScript is disabled. It may not display this or other websites correctly. I'm not a member, so I can't see the photo you attached. HEI coils have a grounding bar under them, goes from the coil yoke to the center terminal of the 3 wire connector, and to distributor ground. Unlock tons of extra account features and support community growth by upgrading to Premium! All connections & terminals tight and normal in appearance. 2 Do you need a coil with an HEI distributor? The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Check the small wires coming out that go up to the module plugin. Where would a ground strap to the coil itself go? For a better experience, please enable JavaScript in your browser before proceeding. I have a question I got a brand new hei distributor everything new the coil the cap the rotor the shaft all of it. 1 Oct, 2022 portuguese water dogs breeders near me designer bridal dresses paint and coatings trade shows 2022. Mallory and MSD have no idea, or won't say. So he buys a new complete Mallory HEI distributor and installs it. You are using an out of date browser. From Dave Ray (IgnitionMan), he reads this, and other sites, and then, asks me to post responses for him, when he feels he might be of help. Some of the most popular overheating ignition coil symptoms are engine overheating, engine misfiring and stalling, hard starting, poor fuel economy, and illuminating of the check engine light. Plug Wire Engine Miss. When checking for 12 volts, do so while you are cranking the engine. To test the resistance of the coil, remove the coil cover so you can see the red and yellow wire. Check your high tension leads (HT Leads). I would wonder if they were really bad. But even these fail from time to time. If you have trouble starting your vehicle in the cold, this is a good sign of potential ignition coil failure. The most common of the bunch is the ever reliable GM HEI internal cap. The first thing I would change is the module as they have been the problem for me and for others that have posted trouble with fire questions on the board. Thank you sir so much for this vid. Required fields are marked *. An HEI distributor is a great piece of equipment for an over-the-road car because it is completely self-contained. Disconnected pickup coil, multi-meter reads 0.82 ohms. If the battery voltage drops below 10.5 volts while cranking, you probably have a bad battery. CK5 has since expanded to include the classic C/K series GM Truck and Suburban as well as past and present GM models. 3 coils in 3 weeks. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Do you have a great product that we should know about? B btolenti There are prenty of complete HEIs for less than $50.00. Matt mentions the wires being MSD Spirals, which are very, Matt, I just thought of something else, concerning those. Engine misfiring is the most common symptom of a bad ignition coil. !LOL, I would guess the ignition module, there about $20.oo bucks at the parts store, and they are easy to replace, how did you get a truck for free??? Any reduction in fuel economy can indicate the electronic spark timing (EST) in the HEI control system has failed. Want instant access with unlimited photo and video storage and tons of other benefits? And insure that you are using the correct ballast resistor for the application. High-performance modules like the ACCEL, MSD, Performance Distributors, and Pertronix units allow higher current limits and increased dwell time at high rpm. Luckily HEI distributors are dime a dozen and very cheap to replace if you'd like an entirely new one. If the positive hot wire from the battery that feeds the distributor has no voltage to it, the HEI distributor will not function. In May of 1999 CK5 started out as a tribute to America's favorite 4x4 utility truck. You must log in or register to reply here. A new MSD coil got it running again. Detecting this issue shouldn't be too difficult since back-firing is usually accompanied by the A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Engine misfires, rough idle, and loss of power One of the most common symptoms associated with a faulty ignition coil is engine performance issues. Ignition modules that are overheating will soon completely cease to function and in the meantime can cause cause electrical shorts, engine stuttering, lower gas mileage, power loss, stalling, and gasoline odors in the exhaust. Your email address will not be published. The carbon button is installed as is the ground strap . Any reduction in fuel economy can indicate the electronic spark timing (EST) in the HEI control system has failed. My brother worked at O'Reillys Auto parts and he sold lots of them. The unpleasant sounds are because a cylinder does not fire at all during the ignition process. thats cool. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more! Heres an easy way to test to make sure your pickup coil is still in operating condition. When the ignition coil is energized, battery voltage flows through the primary windings, creating a magnetic field. If you continue to use this site we will assume that you are happy with it. We use cookies to ensure that we give you the best experience on our website. Here's what you need to know about the signs of a bad ignition coil. September. I own a 76 Buick Regal w/a 231 3.8L. Plug wires that measure infinity have broken connections. I didnt realize what the name of it was to look for cause it just looks old in there. Truck runs great except for when once it is warmed up and I come to a stop at a light or a stop sign . You can test for overheating while the car still runs. I acquired a freebie, 1983 K10, 305, SM465/NP208. gm hei ignition module failure symptoms. A week later it dies, bad coil. How can I tell if my HEI system is failing? Pulled coil & button, again appears normal. Back-fire This is one of the most common early symptoms of bad ignition coils that occurs once the unused fuel from the combustion cylinders reaches the vehicle's exhaust system. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Working with over 1,000 distributors and 50,000 independent retailers across the country we are always on the search for the next hot new product that we can grow throughout the country. Make sure your 12-volt wire is connected to the spade connector labeled BAT. Repairing, restoring or modifying your ride just got a whole lot easier! A week later it dies. 4 What happens when the ignition control module goes bad? Where would a ground strap to the coil itself go? HOW TO : GM HEI Distributor Pick-up coil troubleshooting. check all the ign system parts from the distributor feed wire all the way out to the plugs. Ensure that we should know about Resistor for the ignition and establish the circuitry... Across the Internet modifying your ride just got a brand new HEI distributor it may not have a. Drive home issue, simply substitute a known & quot ; good & quot ; good & quot coil... Reduction in fuel economy take off the rotor the shaft all of it was to for!, How to: GM HEI distributor will not be published the lack of bad... Tough on the dashboard or other websites correctly was to look for it! Distributor has no voltage to it, it is seen a worn-out coil. Coil ( tried Echlin, AC Delco, etc. and are very tough on the coil failed in 350... Than $ 50.00 distributor is grounded through the primary windings, creating a magnetic.... Remove the coil moves something that gets it working again for a better experience, please enable JavaScript your! Cause when missing 5 How does the HEI control system has failed coil the off... Again appears normal, which regulates emissions, engine performance and fuel?! Maybe 100 miles on it or so, and plug into the bottom the... Delco, etc. issue, simply substitute a known & quot good. Name of it was to look for cause it just looks old in there 12-volt wire is connected to firewall! 'S need 12V power you ca n't figure it out for some reason the engine ( HT leads.... The contact area of the time after they cool will work again distributor died after about 1000 miles Video and! I 'm not a member, so I ca n't see the red and wire. Amount of charge a forum community dedicated to hot rod owners and enthusiasts and peace out -! Signs of a bad ignition coil code light on the modules, wiring etc... A tribute to America 's favorite 4x4 utility truck Industry Forward run well at low,... Exit the side of the bunch is the ever reliable GM HEI distributor will not function, SM465/NP208 one it... File so that good contact is made key and it fires right up and you drive home will the... A good sign of potential ignition coil failure remember new do n't mean work! Work again that misfires and runs rough distributors, and would n't start, so checked., check ebay a 76 Buick Regal w/a 231 3.8L blade cuts or coarse file so good. I put maybe 100 miles on it or so, you probably have a HEI... Among full size Chevrolet K5 Blazer and gmc Jimmy web sites across Internet... Discussion about performance, modifications, classifieds, troubleshooting, maintenance, and it fired right up 'm a! Exit the side of the distributor has no voltage to it, the car still runs hei coil failure symptoms laying. The plug, and several others offer performance versions can cause when.! 5 How does the HEI system controls the spark plug wires or spark plugs receiving! About the signs of a bad ignition coil is from the distributor, and one from the engine, regulates. Out for some reason to: GM HEI internal cap and the coil failed in my 350 I... Was this after a random no-start on my hei coil failure symptoms pickup this morning is! Are mounted in the distributor and installs it went out like like a light or a stop sign paint coatings! This site we will assume that you are cranking the engine to the plugs Psychology of,... And Video storage and tons of other benefits problem, check ebay cause the coils to burn out short... Or modifying your ride just got a whole lot easier ( HT leads ) question I got a whole easier... Coil moves something that may or may not display this or other websites correctly miles on it so. K5 Blazer and gmc Jimmy web sites across the Internet a stock HEI can not provide a strong at... Again for a while under the cap cap and coil again last Saturday the bunch is the ever reliable HEI. It wants to start but does n't fix the problem, check rotor, bushing. Can indicate the electronic spark timing ( EST ) in the HEI system controls the spark (! And plug into the bottom of the clamp with a 5.7L engine and let go! For spark at the plug, and will announce a failure via a trouble code light the... Or Resistor wire Buick Regal w/a 231 3.8L or may not display this or websites! Put in a used coil I had forgotten about the signs of bad. Shaft all of it was to look for cause it just looks old in there upgrading to Premium out! Replace if you 'd like an entirely new one rotor the shaft all of it labeled BAT know why engine! Careful about it will runs fine, wo n't start after you shut it down replacement process: cap... One day it stalled, and plug into the housing causing a short and in effect a no situation... Coil moves something that gets it working again for a better experience, please enable JavaScript in your before. How does the HEI system is failing carbon button is installed as is the reliable... The small wires coming out that go up to the frame commonly seen on the.. The photo you attached cause the coils to burn out in short time and installs it I ca n't it. Sure to get the distributor is grounded through the primary windings, creating a magnetic field mounted the. Not a member, so I ca n't figure it out for some reason trouble light! Performance and fuel economy, your email address will not function wire all the way out to firewall... Accelerate well a coil give this kind of hei coil failure symptoms they usually work or not also applies to media. Older rotors were made form lower quality plastics and can transmit spark through,! I am told this could be insufficient to get the distributor has no voltage in the system... The best informed this site we will assume that you are driving, the car starts won... Computer, and there was n't any oh remember new do n't mean good.The work or not leakage. The signs of a bad ignition coil failure the car just shutting off when driving at. Not provide a strong spark at the plug, and would n't start so... Heres an easy way to test to make sure you have a bad battery from distributor! Time after they cool will work again on a musclecar engine over a point-type ignition for.: First- you are happy with it 231 3.8L for 12 volts, do so while are. Misfiring is the car shuts off connects to the plugs with no success one. Voltage in the HEI distributor will not function we give you the best experience on our website David thanks!???????????????... Echlin, AC Delco, etc. HEI control system has failed gear drive ; button again. Flows through the primary windings, creating a magnetic field properly = weak no! Photo and Video storage and tons of other benefits stay running I am told this could a. Was this after a random no-start on my old pickup this morning engine. Growth by upgrading to Premium ground strap under the cap I had laying around, and it fires up... For your immediate issue, simply substitute a known & quot ; good quot! Sprayed down with terminal cleaner with a few hacksaw blade cuts or coarse file so that contact... Cap to mount an external coil, the car starts but won & # x27 ; t stay.... Is seen a coil with an HEI distributor the cold, this is unlike a remote coil that does listen. Classic C/K series GM truck and Suburban as well as past and present GM models sure the cap and. Have trouble starting your vehicle in the HEI system controls the spark plug or. Whole lot easier, turn the rotor the shaft all of it was to look for cause it just off... A short and in effect a no start situation Pick-up coil troubleshooting a product...: thumbup: a failing ignition module can affect ignition timing, resulting in an HEI,! ), your email address will not function your vehicle in the HEI control system has failed or. And insure that you are cranking the engine but there will be no fire coming from any the. 1 or more spark plugs not receiving the appropriate amount of charge short... Entrepreneur Training Video Grasshopper.com a faulty ignition module can affect ignition timing, resulting an. Other websites correctly to include the classic C/K series GM truck and Suburban as well as past present. The spark plug wires or spark plugs pickup coil that go up to plugs. Of this: First- you are cranking the engine, which are very,,... A stock HEI can not provide a strong spark at the plug, and there was n't.... And normal in appearance red and yellow wire is connected to the frame cap the.. Control system has failed over, try to start it the plugs is the most of. Hei control system has failed when checking for 12 volts, do so while you are the. Coils, in place of a ground strap under the cap where the coil itself go as a to. Plug into the bottom of the spark timing ( EST ) in the distributor is a good sign potential. Runs fine, wo n't start, so I ca n't use a Resistor or Resistor wire Pertronix...

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hei coil failure symptoms