Just wanted to say - EXCELLENT PRESENTATION - SPEAKING, CLARITY - EXCELLENT.

Great presentation. An excellent example and some outstanding photos as well. Thanks!

Brilliant! Superb presentation! Thank you Wells Vehicle Technology and Super-Master Mechanic Mike! Job "well" done!!

Great video. My confidence in the integrity and mechanical competency of most shops/tech has been slightly restored by your video (main reason I do most of my own work).

I'be never seen a presentation on spark plugs like this one.I learned something new.

What a great presentation, informative, direct and easily understood. GREAT JOB young man.

I learned so much from the close up comparison of the spark plugs. Very easy to comprehend. Thank you for making this video. Very informative.

Thanks much for your VERY WELL EXPLAINED information! I thought I knew everything about spark plugs and ignition systems before, now I do!

Mike, I gotta tell you, you speak very well, easy to listen to, good cadence, very professional. Nice job.

Mike you are such a fantastic communicator...you presented the issues flawlessly and in a simple manner that even an idiot can understand. Well done.

Most detailed look at spark plugs diagnosis on the tube. Thank you for puttin this excellent video together to help others.

Most guys did their own tune ups. I had a tach, timing light, and dwell meter. Plugs cost maybe $1.50 each. Air filters and that little piece that went into the breather cost maybe $3. Points & condenser was maybe $6 or $8. I did my own, and could dial in the rpm's timing, and dwell angle to perfection. I had a 327 Chevy, and with the engine idling, you couldn't tell it was running. There was plenty of room under the hood to work, even with a big V8. I miss it.

Great video. I must be the same age as your Grandpa. I started working on car's when I was 10 year's old. I'm 65 now. Your video reminded me of the 12K mile tune-ups years ago. Thanks for the information. I still do all of my scheduled maintenance myself. Thanks again. Bill

Very useful and damming evidence of lacking maintenance. Good tutorial. Thanks

I'm a retired licenced aircraft mechanic; a Canadian A.M.E.What he's saying is: Look after your equipment, it'll look after you!

Wow.. I was not expecting such a brilliant video... Great job !. This is a very informative presentation that shares the detailed insights that only experience and know how can provide. I feel like I just came from class having gained a wealth of knowledge in a 9 minute lesson. Thank you. My Pop taught me well also, and I do what I can myself. I'm always looking to learn more, however , and you've delivered some dandy tidbits of knowledge here. .. Big Thumb Up and New Subscriber. 👍🏼🤙🏼

Love watching your videos, thank you very much. This particular video got me thinking about when I first started working on cars in the early 90s. I was seeing cars from the European end of the industry, and it's amazing how much everything has changed. I never really worked on carburetors much but the technology and evolution of fuel injection has been amazing. After seeing this evolution, it convinced me that technology didn't just pop up one day after a ufo sighting in Roswell, 😉.

Great video. Very informative. I'm can't seem to get my SXS to fire and think the plugs are the culprit. This video is a great tool to look for clues.

Outstanding video! Super informative. Very well put together

Thanks for the great video. I learned so much.

Excellent video and thanks for the fantastic explanation!

Changing plugs and coils on 2011 f150 5.0 could not figure why I was having a p0300 code turns out she was arching threw the boots. Thank you very much for sharing your knowledge with us diy guys

Liked seeing the arcing of the energy through the boot to insulator of the spark plug. Never knew that could happen. Good tips : what else to for on plugs, not just gap. Thx

Extremely well done video!!!

Good video, great pictures very informative 👍👌

Great video. Some people just do not realize the importance of changing their spark plugs. There are a lot of spark plugs out there claiming that they can last 100,000 mi before being changed but your manual may recommend something different but that is not always the case as you mentioned spark plugs can wear out prematurely for different reasons so this is a very good video. Example, my wife has a 2020 Kia forte LXS it's the 2.0 motor 4 cylinder obviously and I have read that NGK or denzo spark plugs are the choice from the factory. Her car has the original spark plugs or had the original spark plugs and they were neither one of those, Champion spark plugs. Upon removing each spark plug I have noticed that they had normal wear on them and the only reason why I removed one spark plug to look at it is 1 to find out what kind of spark plug was used from the factory to see about replacing the spark plugs and a part number on the spark plug and 2 I wanted to see the condition of the spark plug which appeared to be normal wear. Kia recommends changing the spark plugs which are iridium every 30,000 mi to 40,000 mi max but the manual recommends every 97,000 mi. The only reason why I took the spark plug out mainly it's because I wanted to see the condition of the spark plug because my wife was having a power issue problem with the car and only being 3 years old I figured well it's got to be the spark plugs or it could be the coil packs. She was not having a misfire but only a performance issue when it comes to stepping on the gas from a stop and it was intermittent. Anyhow, I changed her spark plugs to Bosch double iridium spark plugs which are gapped to 0.039 which I found out they meaning Kia puts the gap at 0.039 but some of the kids are gapped at 0.032. upon further inspection of the spark plug I did not see where the electrode was worn down that bad at all and she has 86,000 mi on the car already so I went ahead and changed the spark plugs as a normal maintenance thing, changed her oil, and air and cabin filter. I made sure that I got the same gap at 0.039 and the car runs or in this case performs like it was brand new from the factory not only does it work like it's supposed to but it seems like it has more pep to it than it did before and I was leaning toward it was the spark plugs causing that this whole time. That has been a month ago and she has not had any problems since. Like you said in your video, maintenance is very important especially for these newer vehicles that have very sensitive components and will throw a check engine light for just about anything. This is for all the people that really want to take the time to read this and know The importance of maintenance. You cannot always go by your owner's manual is what I'm trying to say because at 86,000 mi I change the spark plugs and the owner's manual claimed 97,000 mi on iridium spark plugs but I figured I got the spark plugs that I would change them out it would not hurt and it actually fixed the problem. Something as simple as spark plugs fouling out or just completely slap worn out will cause all kinds of ignition problems so be aware of a problem as soon as it arises and try to get it fixed ASAP because like he said in the video it could end up costing you thousands of dollars in the long run for something as cheap and simple as changing the spark plugs. On a four-cylinder the spark plugs being on top it's very very simple to change them Just make sure you have the proper gap and do your research if you're doing it yourself.

thanks for such a great video, mine are well over rounded. And even have a sandy problem

Thank you for this very informative video, guys. Kudos!

Excellent video I just dealt with worn out spark plugs was able to diagnose and fixed the problem Multiple OBD codes & multiple misfires luckily there was no arcing into ceramic or coils. Car runs like new.

Thanks. Very informative and useful presentation. Well done.

Such an awesome video, wish u were my guidian in this field

Well done. Very informative. Didn't fall asleep once.

Dude I'm a female and you have helped me so so much to understand things I would have never even thought of thank you so much 🥰

Thanks for explaining you make it understandable

I hated points & capaitators. Glad we have advanced. Look after motor & it will serve you well. Awesome vid.

Ditto others - excellent presentation! Thanks

Kudos for covering spark tracking. You are spot on stating that as the spark plug gap increases, more electrical energy is required to create a spark. Furthermore, you are correct in that the surface spark tracks are due to electrical energy finding a "shorter" path to ground. The correlation between spark plug gap and spark tracking is a bit misleading. A good spark plug whose electrode is worn will suffer a dielectric breakdown around the inner electrode's insulator well before sparking through the exterior insulator and traveling down the spline. If surface spark tracks are found, it is most likely due to a manufacturing error, physical damage to the plug, or an old plug. The sintered alumina insulation found on most spark plugs will have micro-fractures whose insulating characteristics suffer with age. An increased gap just stresses the problem, but does not cause it. Surface spark tracking and other forms of carbon tracking are also the result of improperly seated boots, letting in moisture, ionized air, and other contaminants, or installing "dirty" spark plugs in the first place. Tracks on the inside of boots are generally not a problem. Applying a coating of dielectric grease on the inside surface will seal those up and decrease the likelihood of it happening again with a new spark plug. If the cabling is old and the boot is cracked, then replacement is a good consideration. However, if the rest of the cabling still looks good, a cheaper and more effective solution is the use of a third-party replacement boot. That, with some dielectric grease will make it as good as new.

Love the presentation of your videos mike 👏🏻👏🏻👏🏻👏🏻

Excellent info! great job.

Very good clear and informative

very well stated. its good that you showed why the coil had to be replaced. most shops wont go that far.

Cheers from a mechanic from wisconsin!!

Bravo!! Very well done. Great job!!

I love the pry bar holding the hood up!!

Well done! A really good video with great information. And I run nothing but NGK.

Great bit of detective work, especially nice followup evidence/ pictures.

Beautiful explanation. I'm more informed now.

Awesome nice presentation 👍

Excellant vlog!!!

Very detailed without unnecessary fillers of rambling.

Hope you guys continue to make videos like this.. I need to change my spark plugs and a shop quoted me over $150.00 so I think ima just buy the spark plugs myself and install them myself

Great Presentation

Awesome tutorial 👍

That was an amazing information . Thank you.

Very well explained👏.

Best explanation on KZfaq

Thanks excellent video, one of the best.

Really good explanation thank you

Supporting your channel!!!

Wow you really know what are you talking about!!! I'm glad to had attended the ngk technician classes they told us about you and your KZfaq channel.

Very good video and now l have subscribed. Thankyou

this is excellent orientation... thanks a million.

Wow, those were some worn electrodes! Salutary lesson, thanks.

Well explained God bless you

Really, really good. Thanks! I'm new at this and just pulled out the plugs on my 1970 Land Rover. What do I have to do? It's all here in your video. Thank you!

Thanks for explaining what causes spark plug to go bad and fouling. Now i know if i also need to change ignition coils too

Well done, good presentation, thank you. Reminds me that I should replace the plugs on my civic, never have. What you did not explain is why the fouled plug did not have the carbon tracks on the ceramic.

Old but honestly this is the best video I have saw

Nicely explained. U shod do a vid about nitrous spark plugs & why you need to go down to a colder one & so on . Think your explain it to everyone quite well.

Dude, great presentation. So many KZfaqr make an effort to sound "special", but (in my opinion) end up sounding annoying. I actually enjoyed your story about old tune ups. Great presentation

Did a tune up myself ngk iridiums with oil change under $75!

Nicely done.

thanks. Very good advice

THANK YOU, GREAT VID 👍

My dad changed the spark plugs and ignition coils on my 2013 Lincoln mks ecoboost. It only costs him $120 for parts. I'm so glad my dad fixes our cars.

I learned the different between old and new vehicle components

Good video. Thanks

Thanks for the info

Probably old but I had a 2015 Dodge Durango that was misfiring. 2015?!? Crazy but maintenance is so important. So true everything you said. It was result of bad ignition coil. Maintenance chart says 130k. That car was way overdue. Thank you. (Car is fixed with all new spark plugs/ignition coils) .

Good video, you covered some important points. I've always been a diy "car guy" and someone with a pretty good understanding of electricity, but I never put much thought into ignition... I thought it didn't really matter what went on and that the high voltage spark was always a consistent set value (like as strong as possible)... I didn't know that larger gaps and worn ignition components actually placed a higher strain on the coils and caused them to fire at a higher voltage until I started doing more research.

I never replaced my spark plugs and my car has run 314000 km I have never done it because diesel’s don’t have spark plugs

Thanks, Mike!

good video, i had to change my jeep plugs today cause it was having issues power and starting.

If you take care of your car, it will take care of you. Thanks for the video.

Excellent sir

Very good info

You're going to tell me that you didn't have any spare coil boots like that lying around? Baloney! I have a bunch of those very same boots lying around. You hammered and took advantage of that poor customer.

THAT WAS ANOTHER GREAT VIDEO , THANK YOU AND PLEASE KEEP THEM COMING !

Great advice.

Well done!

great just enjoying your vid before I go to work. I do recommend your products to my customers. Send me a t - shirt

Wow really informative video :). I just got my Toyota Yaris back after a year of going through crappy cars. My girlfriend's sister had it for the best part of a year and judging by the state of the oil and sparkplugs, never had any maintenance done on it. Infact two of the spark plugs were loose :O, I presume that could be dangerous? D: .. Now got fresh oil and oil filter and some new plugs in, runs a lot better and sounds happier.

Yeah I bought a used Toyota Corolla I need to pull the plugs I don't know when they did maintenance last on them there's no book I'm fixing a lot of stuff switching out fluids now I know what to look for with the spark plugs thanks a lot

12K mile tune-ups and dwell that changes constantly as points wore plus rebuilding carburetors...ahh the fun days.

Pretty dope my man.

Thanks for the information. Well explained! So, if I understand this correctly.... As the spark plug gap grows wider, the ignition system compensates by jumping the voltage so high that it eventually ruins the coil/boot assemblies, the wiring, and possibly the ECU?? When plugs would wear on the old systems, it would let you know the gap was too large by misfiring. You immediately knew to check the plugs, rotors, etc... No engine check light needed and the cost was relatively small. I guess modern systems are smart enough to detect faults, but they don't warn you (except for oil changes) ahead of time to perform maintenance. The owner's manual doesn't say anything about it either. When the MIL lights, you have it checked out. Besides, once the problems described in this video show up, most folks are ready to trade the car in anyways. Leave it to the next owner to fix.

Great and well-informed presentation! Thank you. But what WAS the deal with the fouled plug? Why was it fouled; and if the current wasn't heading sideways through the ceramic, where was it going?

Great video I feel satisfy that I Gab my spark plug a lil smaller than wider.

A lot of people don't do anything till the hamster under the hood dies.

Most of my old man's school never went to mechanics they learnt themselves, we all got mechanic bill, plumbers bill, etc ..each generation are becoming bigger consumers and more reliant on system