Symptoms and causes of a bad ignition coil

Рет қаралды 635,565

Күн бұрын

The first 4 minutes or so of this video is for you DIYers. I will show you how to identify a bad ignition coil with just a simple test light. The rest of this video I will be showing how to ID a bad coil using both primary current and secondary voltage waveforms on a scope. Finally I will show you how to determine what caused the coil to fail as well as how to repair a plug wire that is damaged, when you are in a pinch.
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

Пікірлер: 337

@rosseryn8216 2 жыл бұрын

I was showing my youngest kid (19) a few months ago ow to repair spark plug wires like this. This is an outstanding trouble shooting, thi sis the 4th video of yours I have watched and they have all been great. Getting the book.

@ScannerDanner 2 жыл бұрын

Thanks so much! www.scannerdanner.com

@johngreen6643 7 жыл бұрын

Good vid man. I do those "field repairs" on wires quite often & the tip for stressing the wire while cutting is a great tip to keep from cutting into the carbon center. Usually I'll just take the razor all the way around & pull off the outer wire. Sometimes the razor does nip the carbon center requiring me to cut the end flush & start over. That's whats great about working on cars, you never really know everything. Thanks for the vid, you do an excellent job & want you to know it is appreciated in Spokane, Washington. Keep up the good work!

@gregcalvert68 8 жыл бұрын

Great information! I just took off the wire for #3 and started the engine...no spark. Shut it off and replaced #3 wire and did the same for #6...spark. Bad coil...Thank you!

@MrHeenanite 8 жыл бұрын

This video was a GREAT tool. My 2006 Chrysler Town and Country had a #2 misfire and I simply seen this video and did the test light trick and the same thing happened just like this video. I replaced all the spark plugs, wires and a new coil. Works like a camp. Thank you very much for the video you saved me a ton of money on not bringing it to a auto shop!

@ScannerDannerPremium 8 жыл бұрын

+MrHeenanite awesome! Thanks for the feedback

@armenta65 7 жыл бұрын

one of the best video's i ever seen this guy was clear . any body would be able to understand how to test for bad coil

@SteveRobReviews 8 жыл бұрын

Now that was cool, ha not you getting shocked - ok that was cool :) but the retest showed the misfire looked like it was gone but you demonstrated the fix was not quite fixed and confirming the fix is a must do. Awesome Paul.

@chasgarza3960 2 жыл бұрын

You are so AMAZING in your lessons. The way you explain everything. Is just perfect. You are my forever go to mechanic on learning online. I'm having issues with the p0300 but I changed the coil and ignition control module and still no spark on the new 3&6. Also change spark plugs and wires. I am stamped. I have fuses in both boxes some work. Some don't on perfectly good fuses. I'll figure it out. I get more and more troubleshooting info. The more I watch your videos. Thank you so much for doing this for us. The money you are saving so many people abs education you give us is powerful.

@ScannerDanner 2 жыл бұрын

What are you working on? Year, make, model and engine size? Thanks! I can help further. If it is a Chrysler or Dodge with a waste spark coil assembly. (4 pin plug) the next test im going to have you do is with a test light on the control wires for the coil. I have some videos on this too. I'd be in my chapter 22 playlist right here on YT

@lorettablevins7669 6 жыл бұрын

coil pack was out on my Plymouth Voyager, I had it installed and it ran great!!,, but.. about a mile down the road started acting up again. long story short... I had to reset the codes. (took off Neg battery terminal for approx. 20 minutes). PROBLEM SOLVED!! thanks for this awesome video!

@Ivan_Glamdryng 6 жыл бұрын

Good video. Well explained and demonstrated. Kudos on elaborating on how to shade tree ( no offence ) the plug wire. You sir are a great instructor.

@markslusz5590 7 жыл бұрын

Thank you!!! I am a novice and these videos really help!

@JahanZeb1976 8 жыл бұрын

Great video dear Paul Danner as always. Learned new concepts to check after a repair. You are correct, normally people are thinking of the spark wires bad where they sparks. Great idea you discussed. Regards,

@ScannerDanner 8 жыл бұрын

+LearningZone thanks so much

@johnmckamy6398 7 жыл бұрын

learningzone do you have a channel, always looking for new channels

@WallysPlace66 7 жыл бұрын

Excellent video. Thank you. I was able to determine that my coil pack is good. I appreciate it.

@xdygmnyrdf 6 жыл бұрын

I'm just watching all ScannerDanner's videos for entertainment.Very interesting to watch him solve new puzzles and mysteries.

@onecrazywheel 8 жыл бұрын

Dang this video helped me so much. You made my day much better. Thank you.

@odinschild8303 7 жыл бұрын

This helped my ALOT. Was the same problem I had. I was thrown off because I was still getting a spark on #2 but not enough ,but my wires were good.

@DaveSender66 8 жыл бұрын

Thanks Paul, I learned something new today !

@rodnewcomb 8 жыл бұрын

Another great video. I learned some great stuff on diagnosing spark problems today!

@thomstittle 6 жыл бұрын

Mr ScannerDanner, you are a God send! I was able to identify the exact problem with my 2005 3.8L Chrysler TC. The number four coil was no spark at all. All others were good spark. NOTE: I don't like eels either. Got the jolt lol. But I learned how to use the tester as in your video. I think I had a bad plug, then a bad wire, then the bad coil. Just like you mentioned in your video. I am going to get the new coil. I already got new plugs, and cleaned the air intake (really nasty) and put on some new wires. Thanks for your valuable information.

@ScannerDanner 6 жыл бұрын

awesome. Thank you!

@chicanoforever9005 6 жыл бұрын

GOOD VIDEO MY I BOUGHT SOME WIRES A WHILE BACK FROM AUTO ZONE SO AS SOON AS THEY WERE INSTALLED THEY WERE SPARKING LIKE THAT!!! PIECE OF JUNK WIRES!!!

@dondale68 5 жыл бұрын

I won't tell ya my feelings on autozone! On my daughter's Taurus w/ the 3.0 DOHC, the coil burnt out, pain in the rump to get to it, got another coil off ebay for $20. Changed it again a year later, ya get what ya pay for! I should know better!

@nemanjadzombic6101 5 жыл бұрын

Thank you for another perfect video!!!

@ozzstars_cars 8 жыл бұрын

Another great video, thanks for posting

@fuckumaddafakka8529 7 жыл бұрын

Nice video, the pacemaker warning cracked me up.

@timmyturner1078 8 жыл бұрын

Thanks a lot man.. just today started to get a misfire on one cylinder. looks like the fix for me

@ilitt59 7 жыл бұрын

Super well done, and you speak and explain very well , do more

@mostlymoparih5682 Жыл бұрын

Shocking lesson. Always good stuff Professor. Happy Motoring.

@christakamatsu8296 8 жыл бұрын

Thanks, very informative! Much appreciated!

@julialeslie9213 8 жыл бұрын

There is a lot of old-tech wisdom here. Thank you for this video.

@ScannerDanner 8 жыл бұрын

Thank you!

@wyattoneable 8 жыл бұрын

Thank you for the tips and lessons on the scanner.

@ScannerDanner 8 жыл бұрын

+wyattoneable no problem! thanks for watching

@jeffreyamoroso91 8 жыл бұрын

That was an excellent diagnosis and determination

@dennisebora 8 жыл бұрын

Very Informative video :). Thank you !

@whitetiger8652 8 жыл бұрын

Great information Paul.

@salemogla1495 8 жыл бұрын

good job all your videos are helpful

@dogfood2525 8 жыл бұрын

Great vid Mr. Danner. I learned a great deal. Thanks. A DIY'er

@ScannerDanner 8 жыл бұрын

+Dog Food awesome, thank you!

@dwayneharmon133 7 жыл бұрын

I actually like this dude

@jamiedevans13 8 жыл бұрын

love your videos Paul. I have learned so much. I also love your brothers videos. I love not only does he troubleshoot but he does the bull work ( the actual engine, transmission, or what ever ). Smart man .... a real 360 mechanic. I know this is not my business, but why as smart as you are and your brother....why don't you and him own your own garage together. Not wanting to be personal. Both of you are awesome. You both together would make a serious money.

@ScannerDanner 8 жыл бұрын

+Jamie Evans we've talked about it but I love my teaching job. Thanks!

@chriscanty8214 7 жыл бұрын

thank you for your service Mr scanner I've learned so much for your chanel

@ScannerDanner 7 жыл бұрын

Thank you Chris

@screwsnutsandbolts 6 жыл бұрын

Excellent videos !

@martinguitarhd28 8 жыл бұрын

Priceless info here for us diyers .Thank you for showing this .I need to join your premium channel when i have some spare cash.Trying to save for a scope so i can learn along .

@ScannerDanner 8 жыл бұрын

+martinguitarhd28 email me through my website and I'll give you a coupon for a free month. You don't need a scope to benefit from the material. Thanks! Just mention this post.

@themountainman2613 8 жыл бұрын

Your one brave tech, Playing with old wire is like playing with a snake, going to get bit:)I seen high resistance in ignition wires do alot of destruction burn through rotors jump terminals in caps.thanks for the voltage ramps good to see bad patterns/ good ones.

@ScannerDanner 8 жыл бұрын

+Jeremiah johnson for sure, thanks for the comment

@robbocop33r12 5 жыл бұрын

I actually jumped when you got that shock at the coil lol, i've had it a few times, i hate it! In fact i even get shocks off good leads on cars if i just touch them accidentally, i think there's something wrong with me! :-) Getting right into the lessons on your Premium channel Paul, loving it!

@chriss4365 4 жыл бұрын

lol i think they are 5k volts a shocking experience.

@israelcasen2185 3 жыл бұрын

Pro tip: watch movies at Flixzone. Me and my gf have been using them for watching loads of movies these days.

@leroylevi7432 3 жыл бұрын

@Israel Casen Yea, have been using flixzone for since november myself :)

@lorenzoanthony6807 3 жыл бұрын

@Israel Casen definitely, been using flixzone for years myself :D

@lildevilchild23 8 жыл бұрын

I've tested for spark with a timing light to by putting the wire clip on each wire to see if the light blinks and found dead wires. sounds dumb but works

@ScannerDanner 8 жыл бұрын

that works but has variables to the test. week spark will still blink the timing light and may not fire the cylinder

@keithshreve6736 8 жыл бұрын

Excellent Video!

@Hidingfrompeople 7 жыл бұрын

Great video, I subbed.

@SoapAndChis 3 жыл бұрын

Thanks for the video I appreciate it.

@mrghiax 8 жыл бұрын

Another brilliant video Paul. Faultless materiel and presentation as always.

@ScannerDanner 8 жыл бұрын

+mrghiax thank you!

@DriveShaftDrew 8 жыл бұрын

very good info and testing

@Candoit2 6 жыл бұрын

Thanks! Now I can check my coil! Have a PO302 code. Replaced sparkplug and plug wire. Still same code and misfiring on # 2. Great video and very helpful. Oh...subcribed!

@ScannerDanner 6 жыл бұрын

Thanks Roddy! Are you working on this same engine? I have some other videos dealing with this same ignition system if you need additional help.

@Candoit2 6 жыл бұрын

ScannerDanner thanks. finished installing coil and everything just as you said in video!! thanks...saved me a bunch of money!!!!

@yobrogoodwht3566 7 жыл бұрын

what a smart guy you are , well done.

@ScannerDanner 7 жыл бұрын

thank you!

@mattalexhoward 7 жыл бұрын

thanks for the info

@johnnysokko8505 6 жыл бұрын

Really like the emergency repair. I learned something useful there too. Thank you for these great videos.

@planet1250 8 жыл бұрын

Thanks for the lesson! Awesome real life trick too :)

@ScannerDanner 8 жыл бұрын

+planet1250 thank you for watching

@nolvissimancaherrera8704 8 жыл бұрын

amigo Danner saludos desde Venezuela gracias por la informacion que aportas atraves de la internet e aprendido muchas tecnicas que eran desconosidas para mi a pesar de no ablar ingles pero atraves de los videos los puedo entender que Dios te bendiga y te de mucha salud vida asta luego

@ScannerDanner 8 жыл бұрын

+nolvis simanca herrera I'm sorry my friend but I do not speak Spanish

@Lecon60 8 жыл бұрын

great video.

@gilbertocarmona8312 8 жыл бұрын

thanks a lot for your video, my car's coils have spark on one side but not on the other I'm going to buy the coils today.

@ScannerDanner 8 жыл бұрын

+sancho villa make sure you check your plug wires for opens too, you can smoke your new coil

@gilbertocarmona8312 8 жыл бұрын

+ScannerDanner alright. I replaced two coils last night on my 95 camaro with a 3.4 liter v6. was going to buy new wires but was running low on funds lol. this coming weekend I'm going to replace them and the plugs which I'm sure are pretty bad but it's running great now even with dirty plugs thanks again

@youguyshearthat 7 жыл бұрын

thanks man appreciate it .

@REPOOCNITSUJ 8 жыл бұрын

awesome video. thanks a million!

@ScannerDanner 8 жыл бұрын

thank you!

@jimbuford4147 5 жыл бұрын

I have a PM. They are not nearly as sensitive as once was as now they are insulated against electromotive current. I recommend still have someone nearby until you see how yours will react.

@stigonutube 8 жыл бұрын

Great video there, those sparks scares the shit outta me "got zapped by 240V years ago my heart was pumping real fast for a few minutes after touching wire just for a second" now i got a healthy respect for power 12v or 240v,not that i meant to shock myself.

@ScannerDanner 8 жыл бұрын

+stigonutube 240v is a lot different from a 12v system for sure!

@alichaudhary2164 8 жыл бұрын

thanx Paul

@neilwilliams8608 6 жыл бұрын

Can an ignition coil cause a car to crank but not run? 2006 Impala 3.9 4 door sedan. Awesome video. Thanks so much.

@ScannerDanner 6 жыл бұрын

I believe your 3.9 is a coil on plug engine, so no, a single bad coil would just give a a single cylinder misfire.

@neilwilliams8608 6 жыл бұрын

The ignition coil is in back near the firewall where the spark plug wires are attached. Just one black plastic piece. Thank you very much for your reply.

@ScannerDanner 6 жыл бұрын

This is a waste spark system then? It has a coil pack with three coils in it. So again, no, a single coil failure would give you a 2 cylinder misfire, not a complete no start.

@jesusmalagon4336 8 жыл бұрын

thanks Paul cool

@mitchellk9907 8 жыл бұрын

hey paul another great video, how about a video on all your diagnostic gear? I recon that would make a great video

@ScannerDanner 8 жыл бұрын

+Mitchell K for sure. I'll do that sometime

@ampload 5 жыл бұрын

Awesome Video as always ! Paul Do you have a "Link " for you Test Light that is safe testing on a ICM Module - Coil I want to purchase one like yours... Thank you my friend.

@jaygames1980 5 жыл бұрын

I like to get everything ready while it's off then start it only to see the spark then shut it off. I have zapped myself a few times in my life. I had a bad coil with too much resistance on primary side and idle misfire. Nobody could tell me what it was so I replaced it and imeadate fix and smooth idle.

@gvvq-pi5ml 8 жыл бұрын

Your braver than me Paul, i had a few shocks years ago and i used "Chicken" pliers after that, complete plastic pliers, Snap on do good ones...50kv doesn't do you a lot of good, they say amps kill but i don't like HT much, i don't have a pacemaker by the way..but I'm still allergic to that lol, i am retired now at 67 years old, but i still enjoy watching your video's..from Fred in England.

@ScannerDanner 8 жыл бұрын

+Tom Smith thanks Fred. I guess I kind of like it :) It keep the neurons firing properly in my brain. :)

@KW-CCCO 8 жыл бұрын

+Tom Smith back in high school auto shop almost 30 years ago a buddy of mine used to enjoy shocking himself on the spark plug tester. You always knew when he was doing it because somehow it backfed into the speaker system inside the shop and you could here it zapping. Lol

@albertsautodiagnosticsllc2130 4 жыл бұрын

Mr Danner in your opinion what suggested training can you recommend to get someone ready for ASE Certs particularly for electrical and engine performance p.s im already a scannerdanner premium member lol so besides that

@Dino30ish 8 жыл бұрын

Who makes the probe you used in the 3rd test ? I am having trouble with a 99 Jeep Grand Cherokee 4x4 , with the 4.0 engine .... I have a dead miss on cylinder 6 , but I do not know how to test the big "6 pack" coil on the jeeps .... Ive done a few tests that point to the coil , like turning off the fuel injectors , ect ............. Cylinders 1 and 6 are connected by the coil , cylinder 1 has spark (and fuel )(evident when I shut the injector off ) but I can not figure out how to test #6 (the idol actually improves 75-100 rpm when #6 injector is turned off ) ............. On the exhaust all 5 cylinders have an average temp of 350* , cylinder 6 is at 120* .... I can smell fuel in the exhaust like its running rich ............. But the other problem I am having is the Jeep will not stay running unless I am on the gas (4 out of 5 times , the 5th time it will idol but it is really rough ) ..... .............................................. I had a random misfire code , so I swapped the spark plugs (they were due) .. After I swapped them , the jeep ran great for about 5 min .... When I tried to back out of the driveway everything took a turn south ................. Now it is sitting in my driveway and I am stuck ... But I do not want to throw parts at it ... 150$ coil is not exactly swap friendly ... All of the other sensors ect are reading ok , but every time the jeep misfires the ASD relay tries to turn the jeep off ....... If I stay on the gas you can feel the engine turning on and off with the ASD relay ............... CKP seems to be ok , but I am not sure what I am looking for on the scope , I have the 4 triggers grouped on the graph like the tech manual shows but I dont know what I am looking for otherwise to make sure the CKP is working properly .......................................................... ANY help would be appreciated , this is my wife's Jeep and our only car at the moment ......... ( ohh and I do have your book , but I am more of a visual learner ... So seeing how its done or being shown what I am looking for works better for me than reading and trying to incorporate that into a test ......)

@nunya6174 7 жыл бұрын

I developed a technique of long needle nose or pliers of choice with a reliably attached jumper wire to ground, spark it all day and it chooses pliers over you every time. one time after I pulled a poor insulating wire off a coil while leaning over a car, if your not grounding your body on the car it's not so bad but if you're other hand is planted or leaning on the fender you give the circuit a return path to ground and the increased current causes exceptionally more stun gun effect/pain, hurts, every single time lol. knowing this I hover when doing this, but one time a bad combo of little too small work pants/possible faulty belt position caused my man bulge to be the closest thing to the car by the fender, my hand was directly on the wire so direct connection there, I was looking down and litterly saw the arc go on the return path to ground out of my zipper area. that's right manhood to ground arc. oddly my hand hurt like hell but just got a strong tingle I'd rather not feel again down there.

@jaimesustaita285 5 жыл бұрын

can u do this with any type coil, like the one i have on my 94 jeep cherokee ?

@hpt08 7 жыл бұрын

used to have to change ht leads once a year on ford escort. bad coil pack on a v8 jag creates loads of heat in the engine bay and enough vibration to make you not want to drive it!

@WhatTheHeckTV 7 жыл бұрын

my jeep cranks no start at all ,im getting 20 volts on ac from coil but no spark from the plug cap,or plug wires any help thanks

@jameswasher3938 3 жыл бұрын

Hi Paul. Another great video. One question however. Around 3:40 you say that since #4 isn't firing you should check the #4 wire and plug (to make sure that wasn't the cause of the coil failure, I assume). My comment is that when you jumped the #4 wire/plug with your test light we had no spark. When you jumped #3 we do have spark. Wouldn't that imply that the #4 wire and plug are OK(-ish) and that the #3 wire/plug is where the problem is? I.e. when you jump the #3, the waste-spark had no trouble passing though the block and back through the #4 plug and wire. Also, since things do fire with #3 wire/plug jumped, doesn't that imply the coil is actually OK? All of this is assuming this is a waste-spark system. I'm probably wrong as I'm pretty new to all of this. I'm just trying to learn all I can.

@zvonimirbobicex-4962 8 жыл бұрын

when u pushed the test light into that plug wire boot, that spark was not weak as u suggested, but strong, bcus there was no open there :)

@cthammontree 4 жыл бұрын

When the coil pack goes bad , can it start out with a little rough vibration at acceleration then get to it does it all the time

@KalashZikov 3 жыл бұрын

Damn good episode

@billrimmer5596 8 жыл бұрын

Wouldn't setting the ohm meter and checking the wire resistance also b a good way to determine high secondary resistance? Around 4000-5000 ohms would work, right? Thank u for all the great teaching!

@ScannerDanner 8 жыл бұрын

+Bill Rimmer yes, you could do that as well

@PineHollowAutoDiagnostics 8 жыл бұрын

Hey Paul, cool emergency roadside plug wire repair! Nothing like a few KV to keep you awake through the day right? lol I have a quick question about the primary current ramp: how do you explain the different signature and lack of turn-on oscillations on the primary current ramp? That secondary winding still seems functional, as the companion cyl still has a good spark...

@ScannerDanner 8 жыл бұрын

+motoYam82 Not sure I can. In this case it is one of those things that may help ID a buried coil (one you can't get to) in the future. With one tower shorted out, there was a difference in that ramp with both the turn on oscillations and the arc of the ramp. But I'm just stating the obvious there.

@PineHollowAutoDiagnostics 8 жыл бұрын

+ScannerDanner Cool, definitely a great idea to compare a known-good and known-bad on the same car. Possible explanation for the different current ramp...might be completely off here but just thinking from basic principles: Since the secondary winding is shorted to the coil pack base on one tower (internal damage), the charges in that winding circuit now have less "room" to move. Basically the CAPACITANCE of one entire spark plug wire is now out of the picture. This would mean that the secondary could not respond to counter the magnetic field of the primary as well as before. Thus it is slightly easier to build up the current in the primary, and the turn-on oscillations (feedback via mutual inductance) are reduced in amplitude. I guess a completely shorted secondary winding would be an extreme case of this scenario... Sound plausible? Ignition waveforms are always the trickiest to analyze :)

@ScannerDanner 8 жыл бұрын

+motoYam82 perfect description my friend. Thank you!

@franciscojrbonaos9364 7 жыл бұрын

hey great video a my car problem a if my car is park if start my car is not starting if car has rest in 15 minute is start again what problem?

@sara78130 8 жыл бұрын

nice one

@blee0518 8 жыл бұрын

04 honda civic, not turning over,. have spark(tested by arc on grounding, just not sure if arcing was very consistent), fuel(new plugs are wet), compression(150-160), where should i start looking from here. this started after my timing belt tension spring broke and i had to fix. timing is exact, hand turned to even the tension. im just lost. no codes either. any help would be awesome.

@eveinfinityz 8 жыл бұрын

Ouch! 11:43 ,keke, great video.

@ScannerDanner 8 жыл бұрын

+Come play Eve thanks!

@rockersuki 5 жыл бұрын

In October my car was misfiring after idling for a few minutes. Turned out I had a burned out spark plug & dirty fuel injectors. Replaced and cleaned, put lucas in gas tank. Ran fine until today. Now it's dying again at idle, engine jerks once when I come to a stop and I notice the loss in power like crazy. I have a catback exhaust and sound is significantly quieter. No lights on my dashboard, but took it to autozone to run diagnostics and nothing came up. Do you think this is a burned out coilpack?

@oldschoolgamerforever6440 7 жыл бұрын

i have 2007 chevy impala with a cylinder 1 misfire and i did exactly the same and my cylinder 1 coil was getting spark? what does that mean?

@heathenthatheretic5960 5 жыл бұрын

I have a 94 deville. Shacks bad and lacks power like krazy. I changed the fuel filter which was clogged full of gunk. But still shacks and lacks power. I think it's the spark plugs. Also car is not throwing and trouble codes at all other than ac being bad. So should I take eack coil off of the distributor cap using the test light and if I get a spark that means good I'd not means bad coil?

@ramonnavarro720 7 жыл бұрын

Is this one of the reasons, the car over heats.? thank you.

@Cyberstrike98 8 жыл бұрын

Couldnt you use a spark plug tester in place of the Verus?

@mohawkmike142 8 жыл бұрын

There is a great rubber lube right there Paul. Brake fluid is the best thing I've ever used and won't harm a thing. Motor oil no so good.

@ScannerDanner 8 жыл бұрын

+moomike laloo great tip! brake fluid it is next time. In hind sight, it doesn't really matter as these plug wires are getting replaced.

@kylewatkins5415 5 жыл бұрын

I have a 06 GTO and the computer says random misfire. Most of the time if you drive it a bit the misfire goes away. But if you stop and turn the car off then start it back, it acts up again until you drive it a bit again.

@arefaynetesfaye1069 4 жыл бұрын

I LIKE IT

@quianagayden4977 8 жыл бұрын

With the coils going bad will it cause your vehicle to ride rough at times Will it show up on full diagnosed text

@sunnyhillestate1 6 жыл бұрын

Great video!!! very helpful. I replaced the spark plugs and wires as they had 80k on them. In doing so I created an incredible miss fire. After verifing that the firing order was correct, I used your method to test coil and found the coil to operate. Then I tested the BRAND NEW wires and found 2 loose terminals.(without getting a jolt). Even still, in park or neutral this vehicle seems to act as being rev limited at 2700-2800. Although during test drive I was able to accelerate throughout rpm range. Can you suggest any solution? Is this the coil pack "going"...Any info would be appreciated! 2006 Chrysler t&c 3.8l I am subscribing!!!

@ScannerDanner 6 жыл бұрын

There is a rev limiter on these when in park or neutral. If it is running good now then you are fine.

@freddylee729 8 жыл бұрын

Thanks for your video Paul. When you are using a test light to check ignition spark, how do you tell that the spark has enough energy? sometimes I'm not sure if the spark is strong enough when using the test light. from Freddie in Australia.

@ScannerDanner 8 жыл бұрын

+HYUNHO LEE I look for at least a half inch arc with most coils producing about an inch. (25.4mm I think)

@stevejette2329 6 жыл бұрын

Bought old 1994 Toyota 4Runner, V6 3.0. Starts fine, warms up fine, then starts to miss when warm. Timing mark jumps around, all plug wires fire erratically. Eventually sounds like it will stall. ANY feedback welcome. THANKS.

@DERRON298 6 жыл бұрын

What should I do when cylinder 3 and 6 is not firing from the coil pack

@rickchapman3707 8 жыл бұрын

I have never been able to repair a faulty HT cable it never works for me I now know i should of cut the burnt bit off nice video Paul!! Oh by the way i bought a second hand Snap on vantage pro which i haven't used yet . There is an Opel Astra that has a engine management problem which im going to have a look at soon...

@ScannerDanner 8 жыл бұрын

+Rick Chapman cool Rick

@paulfiebke3909 3 жыл бұрын

Were can i get the miney skope at? Keep up the good work

@ScannerDanner 3 жыл бұрын

Here www.aeswave.com/scannerdanner-c512/ It is called a uScope

@ayodelesunday4264 3 жыл бұрын

My Nissan xterra 2002 model coil frequent got burnt. What could cause it and what is the solution

@otilucgonzales 8 жыл бұрын

Fantastic video once again!! BUT there is something that I don t understand..and is ..how come that on the fist test there where no spark and sudently on third there where..?as a fact on the first test with the test light it was totally dead..isn't it?

@ScannerDanner 8 жыл бұрын

+martin rodriguez without watching this video, I'm not sure what you're talking about. Sorry.

@buffalobill5709 3 жыл бұрын

What about if you see the spark out of the coil? Does that mean the whole coil is bad?

@geraldmartin3625 4 жыл бұрын

ScannerDanner, you mentioned a website in a previous video for a cheap way to get a wiring diagram. I can't remember which vid it was. Can you provide me that info?

@ScannerDanner 4 жыл бұрын

eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=