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How To Change & Inspect Spark Plugs

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How To Change & Inspect Spark Plugs. How to change spark plugs in an inline four cylinder engine. Changing plugs in a 1999 Acura Integra is a fairly simple job, however there are some tips along the way worth understanding. There’s several things you’ll want to look for while inspecting spark plugs. The electrode may be worn out, you may often see it rounded rather than flat. You want to check the plug gap, using a simple tool. For my car the recommended gap is 1.1 mm, you can check your owners manual for this information. You want to look for oil fouling or carbon deposits around the spark plug tip. It’s also a good idea to inspect the gasket where the plug seals with the head, and make sure the electrode insulator is not cracked. It’s important to replace the plugs with what the manufacturer recommends. NGK recommends not using any anti-seize compounds on the plugs, as the lubricant may cause the installer to over torque the plug. The NGK plugs have a zinc shell plating that is designed to prevent seizure to the cylinder head, as well as prevent corrosion. Often plugs with a shiny appearance have a special coating, thus not requiring the use of anti-seize. Cheaper plugs with a darkened or dull appearance typically will not have a special plating, and in this case it is recommended to use anti-seize. See AutoZone Brand Pages Below: #HoodsUpAmerica https://www.facebook.com/autozone/?fr... https://www.instagram.com/autozone/ https://twitter.com/autozone https://www.youtube.com/user/AutoZone AutoZone Coupon! $5 off a purchase of $25 or more Valid 4/19/16 thru 5/22/16 http://auto.zone/bwfC7 This post was sponsored by AutoZone, but the opinions and content are all my own. And don't forget to check out my other pages below! Facebook: http://www.facebook.com/engineeringexplained Official Website: http://www.howdoesacarwork.com Twitter: http://www.twitter.com/jasonfenske13 Instagram: http://www.instagram.com/engineeringexplained Car Throttle: https://www.carthrottle.com/user/engineeringexplained EE Extra: https://www.youtube.com/channel/UCsrY4q8xGPJQbQ8HPQZn6iA NEW VIDEO EVERY WEDNESDAY!
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Text Comments (513)
Friday Knight Music (1 month ago)
Appreciate your videos. Thanks
josue0238733 (2 months ago)
Just a nice decent rench is over 15$
bobknight33 (3 months ago)
How about spark plug designs and tests ? Which is better spark? Bottom line is how much voltage it takes to spark the gap. The quality of the spark can tell you the temperature of the spark . Where can I find a good video of just spark plugs comparison?
Dixie Innovations (3 months ago)
Hi! Love your vids! Can you do one that goes more in depth about spark plugs? Ie: materials used, heat ranges, length of plug and modded/racing applications
Josh Isralowitz (4 months ago)
Could someone explain to me why using a torque wrench is best practice if a spark plug company gives rotation specs after hand tightening to contact? Wouldn't that be MUCH more accurate vs possibly using a cheap/not so greatly calibrated torque wrench? Or am I missing something here?
The Beagle (5 months ago)
Thank you.
Oswaldo (5 months ago)
Just so you know spark plug prices go for that price per spark plug
David M (5 months ago)
That’s so cheap I paid 70 just for the spark plugs of my f150 alone
mmarkster (5 months ago)
so ho much labor would a shop such as midas cost?
I Am ProdAG (6 months ago)
I have a 73 Plymouth Roadrunner i surely don't have the manual. How can I find out what spark plugs I need? Anyone help. Thank you.
Alex M (6 months ago)
Every 30k miles? Now thats crap
Diavante Laguardia (6 months ago)
On my smart car i removed the spark plugs and they were soaked with oil, is that normal?
Layth Games (6 months ago)
No, you need to get it checked its either a bad spark plug or most likely a leaking valve cover gasket
RICHARD maaske (7 months ago)
Use the anti seize, that now has copper in it .It makes a good ground , Between the Engine Block and the spark Plug thread shell
Robert Johnson (7 months ago)
Great, now I just have to worry about my hemi, which has 16 spark plugs.... It's going to take a while
Dragga (7 months ago)
Paid $30 for a set of 4 Spark Plugs at Autozone.
Dragga (6 months ago)
Layth Games it was their “special” which included a $10 rebate. Regardless it didn’t remove the engine check light. So that’s not the problem as they recommend it was.
Layth Games (6 months ago)
They either ripped you off or you use different currency
Nick Le (7 months ago)
Do I need to change the ignition coils at the same time I change the spark plugs? I changed my spark plus 1 year ago, but I didn't change the coils for a long time.
Layth Games (6 months ago)
How long exactly and if they work and send spark good enough keep em not sure though
Chu Ruilin (8 months ago)
you need to do more care repair videos as Scotty Kilmer is giving out too much wrong info over the internet lol, he though dielectric grease conducts!
poohead (8 months ago)
But how do we know if they need to be replaced or not?
Dana Harripersad (6 months ago)
Remove and inspect for damage as mentioned in the video; also check your owners’ manual for the replacement interval, and follow that interval going forward.
787brx8 (8 months ago)
I run the coldest plugs that I can find for any of my vehicles. Gives me more room for modifications later on. I don't have problems with fouling as I have found the solution for that one. Still looking for colder plugs for my 1.5 liter Protege NA 1998. Stock clutch only holds half throttle. Easily beat a turbo diesel Dodge the other day.
Johnny Blaze (8 months ago)
There is a vast amount of fake NGK and Denso spark plugs on the market. I always buy mine from the stealership just to be on the safe side. Just do a Google search on how to spot these, they have some tell tale signs although it's tough to spot if you don't know what your looking for.
Jean-Christophe Boyer (9 months ago)
Awesome thanks for the video man !
Luis Padua (10 months ago)
I recently replaced spark plugs for someone, and they didn't even have tips left, one was even missing the base for the tip. That think looked like it was only firing on one cylinder.
Oblithian (10 months ago)
Can I ask how much a sponsorship is for a 4 minute video (with say... your average viewership)?
morpheus101a (10 months ago)
90 Honda Accord turn on the key had rough start and rough shake for about 7 seconds car shuts off tried again and started fine and drove back home like nothing was ever wrong. Could this be a sign of me getting new spark plugs?
Reza Grans (11 months ago)
Engr explained never takes a break to breAthe while talking lololololololol -- the rusH to do math, build engines and desigN stuff lolololol
Muli Cohen (11 months ago)
That's some great info, but what about reused plugs? For example, I inspected the spark plugs on a car I bought and they looked really good, but when I put them back in there is no play because the crash gaskets are already crushed, but now I don't know if they too tight or not tight enough and I'm worried it might damage the engine. Any idea?
Kokurokoki (1 year ago)
Just got my car used and it had about 80,000 miles. The engine is rumbling a bit making me think that maybe the spark plugs haven't been changed at all. Will be doing this tomorrow.
fordwindsor351 (1 year ago)
Negative on the dark or black plugs, Motorcraft plugs are black and still are baked with a coating . The use of antisieze on any plug is a no no, to some it's a myth that is dying hard!
KrpytedKid (1 year ago)
have a engine light praying its minor to just a spark plug praying to the car gods
Montez Bond (1 year ago)
Great informative video. I just bought some Bosch plugs that specified having a special coating on the so I guess I won't need that anti-seize after all. Thank you!!!!
MrSalamona (1 year ago)
Hi, my Hyundai manual recommends using NGK BKR5ES but I wanna replace my spark plugs with the V power BKR5E. Can I do so?
Todor Vachev (1 year ago)
Nothing about actually inspecting the spark plugs and the different discolorations
Rex Erection (1 year ago)
What kind of metal in a spark plug would give the best performance in an engine?
LifeIsGood (1 year ago)
What happens if you dont install the plugs tight enough? Will the car not start? Will this damage the engine if the plugs arent screwed all the way in and you try to start the engine?
Austin Hannemann (1 year ago)
Great vid
Buttery Skater (1 year ago)
So knowing about cell walls were more important than knowing this in high school?
Ijnat (6 months ago)
Ikr. I am so glad my school has an automotive class
goin blind (9 months ago)
So butters
Reza Grans (11 months ago)
School is retarded. Practical stuff rarely taught, and i couldnt agree mire
Dresdon Acacin (1 year ago)
my HS curriculum: plants have a rigid cell wall while meatbags have a cell membrane....the nucleus is the brain of the cell. the engine make the vroom
Engineering Explained (1 year ago)
+Buttery Skater mitochondria is the powerhouse of the cell. 😂
Nicholas Stroganoff (1 year ago)
I would think mating surfaces need to be cleaned or wiped before installing anything. Why doesn't anybody clean the top of the cylinder head, where the spark plug mates, before inserting the new spark plug?? I imagine a rag and screw driver could be used, but seeing if you did a good job is difficult. In addition, the rag may push debris on the sides of the well into the cylinder.
hphoto (1 year ago)
nice vid. getting the right spark plug tool can be a real pain. same subject kinda: how about a video on the effect of a bad coil on a v8: heavy vibration & increased heat through exhaust
Krastyu Krastev (1 year ago)
Quick question. How can I discover what exactly makes the isolator get cracked? Could there be a relation with the evap system?
decifal (1 year ago)
Some wires need a special tool to remove to prevent them from breaking.
EvilChairSlayer (1 year ago)
Buttplug ( ͡º ͜ʖ ͡º)
Soldier1287 (1 year ago)
all 4 plugs each interval? I also heard to change plug wire harness?
Herman Pesina (1 year ago)
now if I could only find my owners manual
hostilityy (1 year ago)
which spark plug color can indicate burned exhaust valves?
STE FAN (1 year ago)
i have an important question:Does changing spark plug have influence on your mpg
Karl Isnani (1 year ago)
What if I accidentally drop a spark plug and the tip of the spark plug is bent, I bent it back. Is it possible to use it again? and the electron insulator is not crack or something.
George Henry Moore (1 year ago)
Well, a torquethingemebob isn't cheap.
Dennis Hall (1 year ago)
Do I need to rotate my tyres on a 2015 Honda Civic LX
Jesus (1 year ago)
Is it really necessary to add that dielectric grease??
evan whitewood (1 year ago)
thank u
ליאור בראל (1 year ago)
Hi!I have some questions about the ignition system and I'd be very happy if you could answer me please:(1) Can I replace the wires that are coming out of the coils and going into the Spark plugs with other wires with less resistance in order to get bigger spark and gain more power? (*) Will it not damage the car's computer?(2) What's the difference between a resistor plug an a non resistor plug? (*) Can you put a non resistor plug on every car?(*) I've seen this video on a non resistor plug and on the description he says that the resistor was started in order to suppress the electrical noise for radios and nowadays it's unnecessary, is it true? Thank you very much!
ליאור בראל (1 year ago)
I've learned so muchThank you
ליאור בראל (1 year ago)
Hi!I really like your videos,And thank for all the detailed  information on everything.Thank you so much.
mackinass916 (1 year ago)
does the battery need to be disconnected while changing the spark plugs?
KevinwithanI (1 year ago)
mackinass916 nope
Kyoshi Warr (1 year ago)
short but thoroughly concise. i loved the video dude. appreciate you helping save us time watching it ;)
Alexander Konrad (1 year ago)
Might I suggest to add a note of caution, regarding the importance of not getting anti seize on the electrodes? A common mistake that can be made carelessly when one dosen't know not to.
Xtasy Musik (1 year ago)
very helpful thank you!!
Broj 1 (1 year ago)
I always start turning spark plugs slowly counter clockwise first,holding socket extension in the middle. Parallel to the opening) When the sparks plugs jerks slightly,then start turning clock wise.
ThePariss333 (1 year ago)
Any good to Clean them ? Does it worth ? Thank you
Leonardo Contreras (1 year ago)
easy motor to work on .. how bout something bigger like exp 5.4 ,, spark plug change .... pain in d ssss
Nelson Brügger (1 year ago)
Good to know considerations about anti seize in spark treads, tks.
Sean Burke (1 year ago)
Dear Engineering Explained: The following is my opinion...l. Honda recommends 13 lb/ft of torque WITH anti-sieze. NGK recommends 24 lb/ft without. I'm pretty sure this is the reason for the confusion over anti-seize. Personally I install NGK plugs without anti-seize ONLY WHEN NEW. and torque to their recommended 24 lb/ft. The plating is a sacrificial layer which to me means "one time use". Should you remove your plugs and re-use them. (ie: for inspection, compression checks, or any other reason) re-install them with copper anti-seize and use the recommended 13 lb/ft.
Jarrar Malik (1 year ago)
Please give me an expert advise my Dad's Corolla 1978 KE-30 had misfire Mechanic has changed cylinder number 3 spark plug and car is back on the road with no more misfire,but is it ok to change a single spark plug instead of four?
Adrian Campos (1 year ago)
Hi when after I changed my spark plugs and turned the car on there was a lot of smoke coming out of the exhaust. What did I do wrong?
Eyal R. (1 year ago)
Adrian Campos did the car stop smoking after running for a little bit? if yes you could have water or oil on top of your plugs. and when you removed them it went into the cylinders and got burnt off
Nadir Waziri (1 year ago)
Is 1.1 mm gape normal in a spark plug?And plus does iriduim spark plugs and all that plantinum make any difference?
Keith Kratzer (1 year ago)
I have a 1997 chevy s 10 with the 4.3l v6 and was wondering if when I change the spark plugs if I should also change the wires to? I have no idea when they were last changed considering I just bought the truck.
thanks
Timboslice (2 years ago)
what also would work just as good as anti seize his aircraft grade graphite, is it would still allow the plug a good grounding base to the head.
Jason Lurf (2 years ago)
Hey Jason, what if you did a video on the different types of spark plug tips. Like you know, are they worth buying or what their use is for, etc.
Jason Lurf (2 years ago)
Kind of like how you would do a video on octane rating. The differences.
Frank Gomez (2 years ago)
I have a question about my 04 Dodge intrepid I had trouble taking off one spark plug and when I finally got it off there was looks to be rubber or plastic ring down where the spark plug set at and also some deposit what is that and also how can I get that out I don't have air to blow it out what is a good way to get it out without dropping in the engine
Scotty Kilmer (1 year ago)
try long ice pics or any long sharp tool to break it up in pieces then stab it and bring the pieces out
Avocado (2 years ago)
I replaced the spark plugs and wires on my 05 ford Taurus and now the engine cuts off when I put it in reverse or drive. However, it stays on when in park. Any clues to why?
Scotty Kilmer (1 year ago)
check for any wires or vacuum lines you may have disturbed doing that work
Oblithian (2 years ago)
Are there any other mods you are doing to your car? Perhaps forced induction, further weight reduction, fuel pump, injectors, etc.? Also, did the tower braces end up making any real difference?
madisdad97 (2 years ago)
i also agree with the anti seize info,but the rest of the film was "non-impressive".....
Scotty Kilmer (1 year ago)
oh, not easily impressed are we? Information is often not of the impressive category, but useful for many guys who know too little or nothing at all
Singh is king Mumbai (2 years ago)
Do NGK- iridium spark plugs reduces engine vibrations ?
Scotty Kilmer (1 year ago)
no, they just last a long time.
gold aria (2 years ago)
No I don't have a torque wrench and I bet it's pretty expensive.
Chris Brannan (2 years ago)
Harbor freight sells them for ~30. The specs he was showing where only 25-30 lb-ft though, which really just snug tight (the manual said 3/4 turn after the washer hits) so basically do it when engine is cold so metal isn't soft and don't kill it.
Chris Brannan (2 years ago)
Harbor freight sells them for ~30. The specs he was showing where only 25-30 lb-ft though, which really just snug tight (the manual said 3/4 turn after the washer hits) so basically do it when engine is cold so metal isn't soft and don't kill it.
Chris Brannan (2 years ago)
Harbor freight sells them for ~30. The specs he was showing where only 25-30 lb-ft though, which really just snug tight (the manual said 3/4 turn after the washer hits) so basically do it when engine is cold so metal isn't soft and don't kill it.
Lauren C (2 years ago)
Nice video. Now do a clutch replacement on this car. :P
Mapu (2 years ago)
toby turner's dad
Product reviewer uk (2 years ago)
do bog standard plugs work just fine or do better ones make any difference? ?
Scotty Kilmer (1 year ago)
they all work the same, standard ones just wear out faster
Grayice 666 (2 years ago)
Thank you. I was taught how to check and install spark plugs wrong. This will definitely help me prevent engine damage in the future
BadMadPlay (2 years ago)
bubed awesome indepth vid, thanks man
TECH WORKS (2 years ago)
in my car spark plug siezed and not removing please help me how do i remove them and replace new one thanks
Scotty Kilmer (1 year ago)
carefully use a long cheater bar with a socket on the end and try slowly moving it counter clockswise
Adam Czerwinski (2 years ago)
Maybe you could explain differences between spark plug types (i.e. iridium), heat ranges, etc. For example, for me changing spark plugs to colder ones helped fighting engine overheating after cylinder head skimming (when changing timing didn't help at all).
htboston (2 years ago)
I drive a 2003 Toyota Camry. Same steps as in this video? No tuning or anything?
Scotty Kilmer (1 year ago)
same
riciy (2 years ago)
for a Jaguar V12 this takes an average 3 days..
Defour (2 years ago)
so hows the integra now?
hirayama n (2 years ago)
Liked it ! Just some question I have .....better said I want to know your opinion on this....you say that we should use what the manufacturer recommends.....well in my case the manufacturer calls for a standard plug; I switched to iridium and I notice an improvement in how the acceleration pedal responds and also I can reach every time my car`s top speed.....with factory recommended plugs I rarely got near that speed and after 8-10 000 miles I wouldn't reach it for sure.....Moreover on this....the spark plugs are iridium but aren't even recommended for my type of engine, they are used in other cars engine....but the performance I get from them its way better than mine....I had them for 30 000 miles and still running...what do you say about this?
hirayama n (1 year ago)
Thanks Scotty for your answer, needed that confirmation
Scotty Kilmer (1 year ago)
well, if you have a somewhat weak ignition system, putting irridium plugs with less resistance could make it run better as they need less power to fire to a small degree
jay7264 (2 years ago)
I wanna see you do that with my v6 solara you'll have a bad day. 6 hours later
HD Guy (2 years ago)
I thought it was said foot-pounds
treydaypnw (2 years ago)
great vid, hey I'm using NGK Iridium in my 95 Honda Accord V6 but the Service manual calls for regular copper NGK exactly the ones you used in your video. Am I not getting the performance I should be because I'm not using the OEM plugs?? thanks
André Melo (2 years ago)
Could you tell me why it is recommended to adjust the spark plug gap when the engine ECU is remapped in order to increase the engine power?
Aspiring to Inspire (2 years ago)
I so scared to use my torque wrench cause the first time I used it I snapped the head off a bolt. think it may have been set wrong or the bolts were really old and worn
Craig Turner (2 years ago)
Hi there, just a quick question, since this modern car of ours so difficult for a novice like me to get access to the back, firewall area for 3 of the spark plugs, can I safely change the 3 at front, I can do before getting help for back 3? Any risk with that? Thank you.
Vegaspsycho (2 years ago)
What about regapping iridium and platium spark plugs? I got into an argument with a Autozone employee about spark plug gaps, he said that the gap was unimportant and to leave it how it came in the box and not to try and regap iridium or platinum plugs because you would ruin and scratch them. I thought that the spark plug gap was extremely important because too little and the spark is weak and too much can hurt the ignition system by putting a strain on it. So I made him bring me over a dozen plugs while I measured and picked the ones that were at the gap I needed. Also what about indexing spark plugs? (why? because racecar)
AlGaban Nation (2 years ago)
PLEASE make more tutorial videos !!!!!
Not So Pro Gamer (2 years ago)
Another tip for when getting the new plugs started when installing thme is to stick them in a longish piece of snug fitting hose and then the hose will bend and allow you to still tighten them if they're in hard to reach areas. This also helps to make sure you don't cross thread them as the hose will spin on the end of the plug before you are able to tighten them too much to do damage.
i don't have these tools
James Kozak (2 years ago)
you should always change the wires doing a tune up. the plugs might not get full power. it the coil has been on for along time it would be a good idea to change the coil.
theone1501 (2 years ago)
In general how much gas saving can you expect from changing the spark plugs? (percentage) also what about high end spark plugs that only require a change interval at a much higher mileage?
James Theseira (2 years ago)
Bu...but what if the spark plug area is dirty? What do I do then? *SCARED INTENSIFIES*
mattmboa (2 years ago)
not the case here, but on platinum plated plugs you don't want to gap them, you can flake off the plating. they should be properly gapped from the factory and protected from any impact from the little cardboard tunes around the end

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