Symptoms of Bad Ignition Coil (Explanation and Lecture How to Test It)
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- เผยแพร่เมื่อ 27 ธ.ค. 2022
- In this video I will explain why a car's ignition coil goes bad, how to test it, how to check if it's functioning properly and when to replace it. In addition, I will explain the symptoms and common problem you may occur when an ignition coil is failing.
Top5autorepairs
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You’re sharp as a an old school mechanic; compliment deserved! These are old diagnostic practices before all the fancy diagnostic equipment became a crutch to most mechanics. Thanks for possibly saving many folks diagnostic charges in the hundreds of dollars by using these simple but effective tricks 👍🏼
I corrected the word dance in the original comment to fancy….
This is the best and most simple explanation of cause and symptom of this issue that I found. You are excellent at keeping it simple for us non mechanics who like to try to fix their own issue. Thanks a lot!! 👍🏻👍🏻
Cheers man, made my home repair job easy just bought 4 new coils.
You explained it exactly as my car symptoms. Thank you so much
God Bless the Men. Also, i thought my coil failed. But it was moister in the plug connector. I just dried it with tissue. Fixed.
My uncle just gave me a 2013 Nissan Sentra sv with brand new transmission. After having the transmission changed it started to shudder on taking off so he gave up and gave me the vehicle. I changed all coils and spark plugs after pulling the code p0304 or whatever I cant remember but once I changed out coils and spark plugs it purred like a kitten. 👍🏾😎
Ordered ignition coils...already changed spark plugs...hope it ain't my fuel injectors...about to give it try...thanks for ur input...💪🏿
@@brandonrobinson693any luck on ur situation?
Make sure you sell that thing before the transmission goes again. They go after about
60 - 100k miles terrible transmissions
This helped me a ton! My 04 Bravada had one bad coil, which I found by your pull-up method. Replaced, and I'm back on the road. Thanks! Subbed.
What a great video man!!! When i think of a pro mechanic video this is exactly how i visualize it
Old school mechanic wisdom. Thank you for what you do. God bless you.
Thank you, I got the first method in hand and will try as soon as Soon as I reinstall my fuel injectors.
Excellent tutorial on the different options to test.
Super instructions. Thank you!
Really good diagnostic tips in this video!
Thank you for the explanation!
What you explained we understand well
Thank you
Thanks for making this video. It helped me out a lot! 🙏🏽
Awesome video.
Thanks for saving me money.
Great info .....thank you for the video
you are the best bro be blessed got my self new coils,my car has more power
Thank you for posting this video, I saved alot of time and money, and having to deal with a mechanic.
Thank you for the knowledge
Good explanation. I have a misfire on 2016 Chevy Traverse, but it just gives me P300 (random misfire)
I wish it would give me a specific cylinder code...
Vehicle only hesitates/rough idle when it gets to operating temperature. When its cold in the morning, it runs fine for the first little bit of driving.
Muy bueno, gracias 🙏
Very very good,thanks
Good and very comprehensive explanations about the coil. I learned something new. For my VQ37VHR
thanks bro, you nailed it!
Great video! Thanks 👍😊
Great video, very helpful!
& you given me a response back for likeing you materials, so now I'm subscribed, my sis will be & a few friends, so I say again Sir..
'Thank you' you are great
Ur awesome dude. Thnx for this video.
Thanks for information
Wow great advice and video, i have a check engin light on, it's steady, no flashing. My code is reading p302 its a 2017 jeep wrangler unlimited. Its involved just to get to coil and spark plug on the drivers side of the engine. Is there anything else i should be looking for before i start tearing this apart. It seem like it running fine, low speed, at idle, at high speed. If the check engine light wasn't on, i wouldn't of noticed an issue with it. That's how good it seems to be running. Just scratching my head iver here. Any of your thoughts would be appreciated. Thank you
Thank you! 🇺🇸
I like the old methods of testing coil , sometimes diagnostic scanner doesn’t often detect poor coil unless it has failed completely.
I have a 2014 town and country van, when I step on the gas I get a shale from the engine or trans. Not sure what it could be. Might be the coil, or the cadlic converter. What do you think?
Cann ignition coil cause mpg to be 4-5 below spec in honda crv 2014? I checked no test fire in obd scan tool.
Thank you.
Will you get a check engine light if the coil became weak but still works? My car has a slight misfire and when i go full throttle power is sometimes little hesitant. And how do you check if the coil is weak and not just dead?
My Denali XL ('15 Model) with 150K miles is starting to chug briefly upon starting about every 5th or so time starting. I'm wondering if this could be from bad coil pack or plugs? It runs pretty well once it gets through the initial start, but I know coil packs take a while to go bad so maybe this is just the start.
Can a bad ICM/Rotor/Distributor cap or plug wires cause a rough idle intermittently as well as when I'm driving about 1500 rpm and the truck feels like it's shifting but will also sometimes do a stutter feeling while driving. It always does it when I first start the vehicle and drive until it warms up. I was thinking it was this. I've changed the IAC/Coil/TPS/EGR etc.....the transmission fluid is still clear. I'm hoping it's not the TQ converter.
Interesting , i have been going to a Honda dealer for a year trying to get my car running .
Got desperate and replaced the spark plugs myself . The cause of the problem was obvious to me - BUT it is not mentioned in this video
Thank you!
I got a Chrysler 200 2013 everytime I get to 50 thru 60 it act like it wants to hesitate idk if that could be the ignition coils or not?
Thanks!
Thanks brother
The resistance on each of my coil packs is 1.3 ohms and everyone might want to check theirs! Also i determined that i had a bad connection to one of the coil packs. Now it is acting up again so maybe it wasn't a bad connection after all or maybe one of my coil packs is acting up when it gets real hot!
Thanks man ... For real
Awsome, thank you
Above & beyond,, great explanations & teaching
I was working on my 07 Toyota Avalon. With over 190k (I have 237k now)at the time back in 2021, I replaced all spark plugs , replaced coils but I only left the front three ones. The back of the v6 is harder to get to so I replaced all coils so I didn’t have to. Transmission was also serviced and fluid is bright colored. But I’ve been experiencing shuddering and lack of performance when accelerating from dead stop and vibrating at a stoplight in drive. Do you think it’s because of not replacing the front three coils?
Bravo Well Said Great Info I have the shakes and it also Jerks when pulling off is that the ignition coil also ?
I have same issue.. was your issue ignition coil? When my car runs for a few mins everything sounds perfect again
Ignition coil broke off. It wad sparking orange. Partner purchased a brand new one and it shit itself. What could be causing the issue?
Can plugs or coils go intermittently bad at the end of their lifespan? Scanned my car and it gave me a “pending” code p0303 for cylinder 3 misfire. Now I turned it on again and the engine light is no longer flashing. It drives fine. Weird. Anyhow, I’m not sure if the Spark plugs or coils are bad, but maybe the mechanic can tell me and I could save money and not need to replace both plugs and coils. Good video 👍🏽
Good point.
Coils do not all fail the same all the time. The coil on plug 'pencil' types are subject to much more heat than older designs and will often only misfire when warmed up.
Ford expedition coil no#1 misfire,I've change only that also change all spark plug.now 3,5 misfire...should I have change all coils?
Hi I have skoda rapid i have changed spark coil and ignition coil still I have the engine sign flashing and I have epc.do you know what will be the problem.i have diagnosed it says po351 which I changed more then 3 times after awhile I get still the same signs
Very good
Thank you for so informative film. Is there any mileage after which you need to replace the Ignition Coils? And can faulty ignition coils prevent the alternator from charging?
Update: It was burned Alternator. I've checked w/voltage between Alternator Harness and ground, it was ~ 5V, so the signal fm/ Power Control Module was going on Alternator. Looked like it was a failed Alternator, and it was. I fried the alternator performing one cleaning procedure for EGR Valve ports longer that advised in one film. The time interval to run the engine w/EGR Valve removed should be 2-3 sec, I saw film long time ago and mixed up, I thought 20 sec. When I counted to 10, I shut it off since Rpms went to 4000, it was very loud sound, and a smell of burning. I thought it is carbon particles are burned, but it was the alternator. After I replaced it the problem was solved. Not big deal, but I'm surprised why the fusible link between the Starter and Alternator survived, but the alternator was burned? Can someone tell for how many Amps you use a fusible link for the alternator on 90 Amps. I've read that usually you go with 20% higher Amps, so for 90 Amps alternator it should be 118 Amps. They sell 100Amps fusible links, but I'm not sure about those 20%. They also sell 80 Amps, but you don't won't to go too low, since your alternator can get disconnected too often. Can't find that info anywhere, so I would really appreciate any opinions on this matter. Thank you for this informative film and attention to my questions. It helped me to zero down the problem.
Usually ignition coils should last beteeem 50,000-100,000 miles. To answer the second question, a bad ignition will not prevent the alternator from charging. It's unrelated.
@@Top5AutoRepairs Thank you so much. Just in my scanner for possible solutions of the code P0631 (I have Battery Light and that code, the battery is not charging, the voltage on it drops w/engine running) they say: someone replaced Ignition Coil(s), also Engine Collant Temperature sensor. I assume those parts also can cause P0621. Thank you again, your films are great, it is a pleasure to listen to such a professional.
My nissan misfires wen warmed up and the rpm drops wen i unjack all the coil packs cud it still be ah coil ?
Give this man a riase
Sir ignition coil kiya set ma change karna chahiya ya khali go kharab hua ha wo bhi change kar sakta ha. Honda civic 7007 ma. Or honda civic 2007 ha orignal spark plug ka part number bata den ga. Thank you
Good tips 👍 thank you bro
If i have P0350 what can be the cause of this trouble code and what should i do??
can you nake a video showing us the sparks n the differences please
My altezza rs200 losing power while drive after change transimission somebody told perhaps piston ring gap so I have to overhaul engine or buy new engine
What if your vehicle won't start? My truck lost all power going 70 mph and wouldn't turn over. Has power so can I just turn the key to accessory?
Thx
My coils keep going bad on my 2002 F 250 I replaced all of them when one coil went bad about 3 years ago and now 2023 and 2 coils have gone bad and today another coil can anyone please give me some advice I keep taking it to a highly recommended garage and they fix it and don't charge alot but the coils keep going bad
I have a misfire on 7 and i swapped it out with some extras i had but the engine stopped shaking and the rpms dropped to .5 and not on 1rpms which is where its been
my 5.4 2 valve is miss firing but no service engine light and code reader dont show miss fire
If I get bark on the boot does that mean it's still good
Question: is it bad for the engine to idle the engine while you have one coil totally removed?
Helloo my car keeps stalling on a highway visited a mech and they keep changing spark plugs but the symptoms persists. Kindly help
Charles from kenya
How do you know if the spark plug is bad and how to test
Who ever reads this and having trouble telling if your car going out or about to turn off /1.make sure you have a new battery or alternator that can cause your car to turn off with no response just noise 2. Make sure you replace your head gasket and starter. head gasket will cause your car to turn off randomly at any given moment and you might panic thinking it won’t start but let it cool down then start it. bad starter going to be rough every time you start your car might be quick or the sound of your starter starting the car will definitely make your face expression change but if it’s to late for that warning then your car will turn off but you be Able to turn the power on but not the car itself unless you knock it with a hard item 3. Bad transmission or coils pack now this a tuff one because both problems have the same symptoms when you accelerate on the gas you will lose power in your rpm but I’m sure if you having a bad coil problem your signs in misfiring or slip in your rpm your acceleration will make you go slow then randomly speeds up bad transmission when your accelerating you down on power meaning if your driving 40 or 50 your car rpm will start to jump or start going down while your foot is on the gas paddle
Id just tear the motor down take head gasket out so it breaths well when put back together... Oh and file the rings down smooth before putting head back on
Can just a bad , failing, old spark plug cause the exact same symptoms you’re talking about?
Yes
I need help, my 2012 jeep patriot have a misfire for cylinder #4 , I put new spark plugs and swap the fuel injector and coil from #1 to the #4 and still got the code for cylinder #4 I already checked the compression and #4=190 #3=160 #2=190 #1=185 and I checked the volts connector with a multimeter and I'm getting on all 4 almost 12v the only thing that I have not change are the coils. Any ideas, thanks
What turned out to be the problem?
How would you diagnose a coil that's misfiring sometimes but not all the time? I recently bought a 2002 Lexus LS 430 with the 4.3 liter V-8 engine and it misfires part of the time but not constant and there's no check engine light on.
How do you know it is actually misfiring?
@@explorehunter It's fixed now. I took it to Autozone and they hooked a scanner to it and it stated that there was a misfire in #1, #2 and #5 cylinder so I ordered ignition coils for it. I can usually tell by the way the vehicle drives and feels if it's spark related.
@@bodeine454
great that your car is fixed! My car also vibrates while cruising at 80-110kmph and the vibrations comes from front end and center console. I am going to replace engine mounts and see if the problem solves. No misfire code yet here. GS430 2004.
@@explorehunterAny updates?
I saw oil build up on my first ignition coil from the left
I had a bad coil yet when I scan the car no code
What are the odds that all the coil packs fail at the same time ?
Can I change like 2 coils this week and the other 4 next week. Between the tow, the plugs and coils I can’t do them all
Or will that harm the car more
I already changed the new one but it's still not working.
Is it possible that the car is not giving a code but the coils are beginning to fail? Car rattles at idle while on drive I changed the throttle body and some motor mounts also the belt pulley and belt. No code at the moment
Yes it's possible due to weak spark. Worn spark plugs and failing ignition coil.
Yes it's possible due to weak spark. Worn spark plugs and failing ignition coil.
So I am trying to figure if I didn’t gap my plugs properly of if my coils are failing because every morning when I go to start my car it’s rough but when I warm it up and start driving the symptoms go away I recently changed my spark plugs and the battery on my Dodge dart I have regapped my spark plugs three times and it’s still starting rough engine feels like it’s shaking
Did you figure out what was wrong?
@@adamchanez7470 I did it was bad motor mount and I wasn’t supposed to gap pre gapped plugs so I had to buy new ones. Now I have a bad control arm problem
hi, when I pulled the coil out it had oil at the bottom, where it goes over the spark plug, could you say why is oil there? Does that means that my engine is going bad?
There is oil because the valve cover gasket/spark plug tube seal is bad and is causing oil to leak inside the tube. Most likely the engine is 👌.
Hey so i have a similar issue….. i had a P0301 come up and then disappear….at red lights or stop signs car shakes…..rpm also sits below 1000….when accelerating it seems fine….i held the ignition coil above a little and heard that tsk tsk tsk sound on all of them…..i also sprayed throttle body cleaner in the throttle body….im not sure what else it could be….it’s a 2006 nissan altima 226k miles….can anyone help please
Nissans eat coils for breakfast
I always figure out why things went bad. If you just "replaced a coil pack" what did the plug wires, boots, and plugs look like because that's why they usually go bad. If that's a Ford with "cop" (coil over plug) ignition it's cheaper and usually just as good to just replace the spring and boots and clean the contacts than it is to buy a Ford coil. Just about every vehicle made works better with manufacturers specific parts. They release a spec (a range of specs) to aftermarket parts and it's usually non specific so it doesn't run quite as well.. might have more power but consumes more fuel or other things you might notice. Try buying manufacturer parts rather than aftermarket if you want it to run like it did from the factory. But those COP's are rebuildable if you're a home mechanic. Someone with a garage is just going to replace the whole thing because of what labor costs. But if I had the choice of new aftermarket or rebuilt manufacturer specific I'd choose rebuilt manufacturer specific.
Thank you friend help me save some money
i pulled my ignition coil and it came out with the other half stuck and the middle spring
Is it normal for some coils to have little scratch lines inside?
Scratch is fine but if it's cracked then it needs to be replaced
I ended up pulling all 8 connectors, 1 at a time, to see and hear engine rpms change. Cylinder 5 and 7 ended up having bad coils. When I pulled connectors on both, the rpms didn't change while shaking, but the others did, so that's how I knew they were bad. I changed them today, and engine has all 8 cylinders firing again. YAH!! BTW, I did check the spark plugs to see if they had spark, with the help of my buddy giving me the idea of checking the plugs with my lawn mower. So all is good, for now.
My Acura STX 2009 no stered how can check it power the coils only crank to stered don't do it thank you
Can a failing coil work fine when cold but as it warms up, begin to fail ?
Yes it can
Yes
Solved my coil issue, had a short to ground at the plug going into the coil@@johnnyjackson9641
Driving car no problem??or some problem if i drive the car???
I use the coil stress test to check for bad cop.
Why is there no explanation for testing the resistance of the ignition coil with a multimeter?
My car currently
Show a live demonstration
What if you can’t even start your engine
❤
I only have one coil.
Thank yu sooo muchhh