How To Replace The Spark Plugs On A Mazda CX-9

Brian Eslick from How to Automotive www.howtoautomotive.com takes you step-by-step through the process of replacing the spark plugs on a 2006-2015 Mazda CX-9 with a 3.7L engine. This video also features the new Milwaukee Tools M12 FUEL 1/4 and 3/8 cordless ratchets.
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Owing to factors beyond the control of How to Automotive/Brian Eslick, it cannot guarantee against unauthorized modification of this information, or improper use of this information. How to Automotive/Brian Eslick assumes no liability for property damage or injury incurred as a result of any information contained in this video. How to Automotive/Brian Eslick recommends safe practice when working with power tools, automotive lifts, lifting tools, jacks and jack stands, electrical equipment, blunt instruments, chemical lubricants, or any other tools or equipment seen or implied in this video. Because of factors beyond the control of How to Automotive/Brian Eslick, no information contained in this video shall express or imply warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or information contained in this video is the sole responsibility of the user and not How to Automotive/Brain Eslick. #howtoautomotive #MilwaukeeTools

[@chrisb4697]

This is one of the most informative how-to vehicle maintenance videos I've seen. Includes socket wrench size, torque specs and detailed step-by-step instructions. Great Job. Pain in the A$$ having to take off the intake manifold.

[@HowtoAutomotive]

Thank you! I agree it is a little bit of a pain to take the intake off. Thank you so much for watching!

[@2011mymazda]

@@HowtoAutomotive HOW MUCH DOES A JOB LIKE THIS COST??

[@Gauthierbrad27]

This just may be the single best automotive how-to tutorial that I’ve ever seen. My wife’s CX-9 started running horribly yesterday. Out of nowhere, my gut feeling was that it was an ignition coil or a spark, plug, sure enough it kicked up a misfire on cylinder three (Natalie had to be cylinder three, the absolute worst one to replace). I’m handy, but I’ve never done anything like taking off the intake manifold. It took me a while, and I must’ve watched this video 10 times total but I was able to get through the entire job and it resolved the issue for 100 bucks out the door. If I brought that to a shop, it would’ve been hundreds more I’m sure because of the labor. Thank you much dude, you’re a lifesaver!!! Literally everything you need to do for this job is in this video.

[@ocmarts]

My local Mazda dealer just quoted me $780 to replace them.

[@willmann30]

Fantastic job 👍👍.

[@cdpc211]

I know this video is old but it's very informative. This is the best video I have seen so far with instruction on torque specs. Very well done.

[@HowtoAutomotive]

Thank you!

[@user-ny1nq9lh7m]

Excellent instructions. I was hesitantabout tackling this job, but i took my time, followed your very clear instructions, and car runs great. Thank you!

[@HowtoAutomotive]

Awesome glad the video was helpful. Thank you for watching!

[@harley5881]

Thanks for this tutorial. My Mazda CX9 has been running horribly for a long time and thought it was a transmission issue but after reading some of the comments to this video I thought maybe it’s worth changing the plugs and the coils at the same time as it’s such a pain. WARNING there is one plug that is missing in the video on the back driver-side near the hose that is a bit of a pain to get out, I found it easier to pull it out of the top of the engine than to pull the clip off the Air intake. Also make sure no debris falls down into spark plug holes or intakes. Good luck. No misfire codes were up but was misfiring at about 1500rpm under light acceleration. Suspect original plugs at 250k km. Gap was 1.7mm. Recommend is 1.3_1.4mm. Not one miss after one week and better low down power. 👍👍

[@wastikumud]

Great video! I could not have replaced my spark plugs without this tutorial. Thank you.

[@ezrider831]

Great video! Clear and concise. Many videographers can learn a lot from your video style. Thank you for posting.

[@chickenfingers6218]

Best vehicle instructional video ever, thank you so much. You are a gifted teacher and this video was much needed.

[@stevehensley6969]

Thanks Brian. My wife's '10 CX-9 is approaching 200k and I want to change the plugs. You have made it easy for me.

[@HowtoAutomotive]

Glad to help. Good luck with the spark plugs and thank you for watching!

[@huddarudda2244]

fantastic video, super easy to follow and great pace. couldn't be better! thank you

[@WindTherapyToday]

you did a phenomenal job walking through every part of the job....thank you so much, Brian!!!!

[@davidwieda794]

Brian - This was super helpful and an excellent resource. Well filmed, good lighting, excellent audio; just all around good stuff, Great job sir! You've successfully squelched my concerns about doing this myself, a pain in the back side no doubt - but doable. You've also proven why this is worth it when paying a professional mechanic to do this - it's very involved and time consuming.

[@spc3myers]

Great video, really appreciated the fact you mentioned socket sizes and torque settings for the bolts. This has been a huge help! Thanks again.

[@HowtoAutomotive]

spc3myers Glad you like the video. Thank you for watching!

[@redsnapper1960]

@@HowtoAutomotive monomer no erppnnk9ovvpbbobbob pop pep Lol pov no VP cc BB v cc BB ocppn 00 jm7v on be BB b be pb o:p ;⁰gg&ghghg

[@mr.h4898]

Thank you for taking the time to put this video together! Great tips!!!

[@HowtoAutomotive]

Mark Levi thank you for watching!!

[@SilverHunter2013]

Excellent tutorial. Doing this in a few days. Thanks for the links for the gaskets

[@dsmoovest]

This is very helpful for me, as a beginner with limited skills. Thank you. My buddy had a 2008 CX-9 Grand Touring that the water pump failed on - and he got a hefty estimate for the pump repair so I bought it from him because my next door neighbor is a great mechanic & recommended I get it so he can help me. That engine is too concerning for me after reading in forums that when the water pump fails, the coolant mixes with the engine oil... which is never good so I'm selling it because I don't want to take the chance, even though my neighbor thinks it's just laborious. I'll put the parts back together now after watching your video.

[@DJR5280]

Keep in mind Ford updated the water pump. It also has a weep hole that's supposed to leak externally out of the block before the pump fails and leaks coolant into the oil. Check your oil and coolant level when you fuel up and you'll be fine.

[@TomZ23]

Thank you for this video. I just changed my plugs on a 2009 Mazda 6 3.7 L. It was pretty easy.

[@alfredbordelon]

GREAT walk-through, Brian. Thanks!

[@brandyn6393]

Excellent video and description! Love the mention of sizes, torque, and order putting everything back together. I love the last second correcting the upside down oil cap. I like always having it face upright too! :) Well done, Thanks!

[@SuperchiefApache]

Thanks for the tutorial! It was easy, fast, and painless!

[@nickk8757]

What a great Video, very informative & well presented, Brian thank you for taking the time & sharing.

[@traceyk6541]

Just finished a 2010 CX9.....Thanks for the help! Saved me a lot of time and guessing....

[@ingram1225]

Thanks for this video. At first the task looked very daunting but you reduced my stress.

[@HowtoAutomotive]

william ingram jr glad the video was helpful. Thank you for watching!

[@GSOAguitarplayer]

Thank you for making this video. I have a 2014 cx-9 and wondered how to do this.

[@carlospolanco1714]

Yeah, this i'll just pay for someone else to do. I don't have the tools to have this be a home job. Excellent video!!! thank you!!!

[@celsalazar77]

Yup same here, my wife was talking about taking it to mazda and I'm like i can do it . But nah, I'll also just send it to the shop

[@WarriorOfEden3033]

$50 in tools

[@hyperspaceexplorer5594]

@@WarriorOfEden3033hat is without torquing to specs. If you want to torque to specs plus the correct tools like the spark plug socket, extension, and the torque wrench, then it will be more than $50.

[@WarriorOfEden3033]

@@hyperspaceexplorer5594 don’t need expensive tools to maintain your own car

[@danthecarman8440]

Your videos are so informative and great camera work.

[@HowtoAutomotive]

Daniel Abela thank you! Glad you like them.

[@AzMz6]

Great video! Thank you for the primer before i tackle this on my 07.

[@debjulmar]

Most outstanding video! Straight to the point and complete. Well done!

[@HowtoAutomotive]

Thank you!

[@christopherrelyea349]

Excellent instructional video! Thank you for showing this DYI.

[@jonathankim2650]

Thank you for the step by step instructions! Really appreciate it.

[@HowtoAutomotive]

Jonathan Kim thank you for watching!!

[@user-fq8to1rc3h]

Thank you so much for sharing your knowledge looking for more valuable videos.!

[@angelo747]

I'm glad you corrected the oil cap orientation at the end 👍🏼

[@jizzwad632]

Ok so thank you so much for this! Did it myself and it wasn’t bad at all. I wouldn’t have changed the gaskets because mine looked and felt the same as the old ones but whatever. You can absolutely do this without the Milwaukee tool . It did look nice though.

[@anthonyshutts7399]

You are best I have seen. Your informative technique is fantastic! Thanks so much!

[@HowtoAutomotive]

Thank you!

[@oldschoolvolvo]

Thanks for the walkthrough! Helped me replace the plugs on my 2010.

[@AubreyEJones]

Is it possible to do without removing the airflow system

[@oldschoolvolvo]

Aubrey E. Jones no, the upper intake covers up the rear bank of cylinders.

[@TC-en7vi]

Very helpful!!! Thanks!!! Do you have a video on how to change the valve cover gasket for this car?

[@rc-markmill2262]

I just changed my CX9 plugs using this video. Very complete and accurate. I watched all of the videos on KZbin, on this subject, and this is the best one, IMHO. No error codes and it runs noticeably better. Thank you!

[@KN-mi7mh]

What changes did you notice? Mine is slow on acceleration and once in a while starts hard

[@rc-markmill2262]

@@KN-mi7mh That is exactly what mine was doing before I changed the plugs. I also changes the PCV valve while I was in there. It was definitely bad (oil consumption, oil on the intake). PCV is a cheap fix. Common.

[@rc-markmill2262]

No codes prior either to suggest plugs. Changed them at 100k miles.

[@kamausk]

very good information i realised that i just as well pay someone to do it..its more work than any other car that i have worked on before.huge help before i start something that i might not be able to finish

[@HowtoAutomotive]

kamau stephen Glad to be your help you make the right decision. Thank you for watching!

[@Toolaholic7]

I am a huge believer in using the OEM plugs only.Have seen so many problems with those problematic Bosch and E3s causing misfires

[@markg5916]

I did this along with spark plugs and coil plugs and it restored all the lost power and fuel economy. Great video.

[@HowtoAutomotive]

Glad the video was helpful. Thank you for watching!

[@smith6098]

Mark, how long did it take you?

[@markg5916]

@@smith6098 Probably five hours or so. Only thing I did different is removed the fuel rail from the injectors by removing the clips while it was in the vehicle. My injectors were stuck so I didn't want to damage the rail by pulling the injectors out with the rail. Then I clamped some channel locks lightly on each injector and pried with a screwdriver on the jaw of the channel lock while pulling. That's only if they are too hard to just pull out. Reassemble the injectors, rail and clips like he did in the video, lube with some silicone grease lightly and they should seat in nicely. Make sure the clips are seated correctly. I gave the clips a little pinch before I reinstalled them. I also removed the battery, cleaned the intake manifold and cleaned the throttle body. Also you can leave the hose on the back left clamped on the manifold and just disconnect from the bottom because there is no clamp it just pulls off. Last thing, clean the injector ports real good. Mine were filthy. I used a Phillips screwdriver and covered the tip with a rag lightly turned the screwdriver in each port till they were clean. Very light though, you only want the rag touching no the tip of the screwdriver. Last thing, I removed the wire harness covering and replaced it because it was brittle and cracking, it will get everywhere so just replace it if it's cracking. I blew out the engine area and wiped the down till all the crud was gone. Sorry for the novel but it's fresh in my head. Hope this helps.

[@davedave9552]

This video is exactly what I needed!

[@ricardocuetara1]

Great video! I could do the job thanks to you. Thank you very much!!

[@dgallegos1686]

Thanks this was very detailed information really helped on the change of my vvt

[@HowtoAutomotive]

+David Gallegos glad the video was helpful. Thank you for watching!

[@TheDeemon914]

Thank you for the instructional help video. It really helped me with the maintenance I need to do on my CX9. Thank you!! ❤ Btw…I can’t seem to find which valve and throttle body gaskets that you used. Please help.

[@badboy3211000]

Thank you thank you thank you! I am about to change the spark plugs on my 2007 CX9!

[@SLOW6]

Great video mate!!!!

[@jeffashton5702]

Extermely helpful and very well done. Thank you!

[@HowtoAutomotive]

Jeff Ashton glad it helped. Thank you for watching!

[@magnosantos2920]

But you are the best teacher I've seen thank you so much

[@rustym9476]

Very good video Brian, by any chance do you have a brake booster replacement video on that same CX-9?

[@IgorGrudenic]

Mazda dealer just quoted me $1200 for the labor&parts. Independent shop quoted $500. Both in San Francisco area. Thank you for the video, I think I will give it a shot myself.

[@760escokalifastlan]

Great video. Really good explanation. Thanks!!

[@HowtoAutomotive]

Alejandro Torres thank you!

[@user-ut3pe6bc4k]

This is need a great video by far in this topic and I am going to save a lot of time and money. I have one question though, my 2012 spec says .051-.057 should be the gap but the plug used in this video comes pre gapped at .044. Should we re gap? Or it will cause roughy engine. @HowToAutomotive

[@siomworkshop3212]

Thnx for video. Very helpful..

[@HowtoAutomotive]

vicky rachmanto glad the video was helpful. Thank you for watching!

[@duanelindala5830]

So very helpful! Thanks! We got the job done!!

[@HowtoAutomotive]

Nice. Thank you for watching!

[@joshuacarreon9464]

Great vid very helpful

[@tmshokie]

Stellar video. Well done, sir.

[@HowtoAutomotive]

Thank you!

[@audielrenteria578]

Thank you for the lesson

[@astrorota]

excellent video

[@boxerboggs18]

Thanks a ton. Helped me save $600.

[@siomworkshop3212]

After opening trottle body, whether to reset idle learn volume?

[@christinalouise2785]

Thank you for this video! I am having a shop replace mine today and after watching this I see why they are charging me what they are. I'm used to my little car's spark plugs being a ten minute job and this is a lot more complicated. Now that I have found this video though, I think next time I will do it myself. I'm having the shop change out my engine and transfer case oil too while they've got the car so it is worth it to me on this rainy Oregon day to let someone else handle the job :) Thanks again!

[@obtainiumgaming4472]

Did this today. It’s a big job. Beware of the hoses behind the manifold. He makes it look easy but it was a bear to deal with. Good news is car runs good again and what I thought was a transmission issue was just a tune up needed on 200k spent plugs and coils.

[@KN-mi7mh]

That’s exactly what I thought it was transmission problem

[@butlersouth]

Very helpful. Thanks!

[@nickklaas4776]

Nice video. Where the wire loom is connected to the front driver’s side of the intake is a question. The loom bracket has a spring that goes into that raised hole. What is that?

[@Jake3135]

Life saver. Thank you!

[@kinfzac95]

Great video

[@1capitals]

Very descriptive! Thanks

[@kaisilva7154]

Great video and explanation with detail! But man that is a lot just to change spark plugs hahaha

[@TC-en7vi]

Thanks for this video!!!

[@tonyduong70]

Very helpful😁 Thank you!

[@HowtoAutomotive]

Tony Duong glad to help. Thank you for watching!

[@robertmorgan8104]

Thorough and Concise.

[@mohanadelmazahy]

Thanks for the detailed video, I did all of that and the engine starts smoke white alot !!!!!

[@stevenclark6662]

what gasket kit did you use? I have a 2008 CX-9 Touring, I suspect it will likely be the same

[@robertstiles3613]

this is a great video, thanks. I hate to pay anyone to do something I know I can do myself, just need some concise instruction .

[@Rufat011]

Well Done. Very clear explanation. i even would like to do it myself, but scared

[@thbryncrz]

Great video! I noticed you installed the NGK LTR6IX-11. Is the thread pitch a little bit longer than the Motorcraft SP-411 AYFS22FM (the stock one)? My mechanic is saying he cannot install my recently bought NGK LTR6IX-11 for my '08 because it is not the same size as my current one, and if the NGK ones are installed, it might hit the pistons which will cause serious damage to the engine. Is that really the case?

[@edwinjavier7267]

Great video, but should you have cut off power from the car battery before replacing? ...

[@jandrzymaa3200]

Great video and very helpful. Gould you write here also a cylinders order in mazda cx 9 v6 3,7 l, because i have cylinder #2 misfire. I'm pretty shure that i've to change an ignition coil, but i'm not shure which one is it. I've found new different opinions about that in the internet. Is the 2nd one rear in the middle?

[@aweirdperson.864]

I am late by a year, but rear middle yeah. Pretty sure you figured it out by now 😁

[@danielarroyo121076]

Your the best period I wish you were in ct I'll make you my personal favorite mechanic

[@Agnovo]

Great video, wish I had watched it earlier 😭 I just paid $350 for the mechanic to change the spark plugs and just 1 coil

[@HowtoAutomotive]

That’s sucks. Thank you for watching!

[@gonzalosanzanaduarte9828]

Do you have to recalibrate the throtle body? I have a sound and the motor light pop on the dashboard

[@johnfrederick9840]

What torque wrench did you use? The only ones I can find online start at 10ftlbs.

[@mrcarpet4u]

I was thinking about buying a (3.7engine) Mazda 2011 GT with 69,000 miles should I change the water pump and timing chain?

[@scraphouse88]

In the front on the vent line going to the valve cover on the other end of the line that attaches to the air cleaner, there is a plastic tube that connects the line to the air cleaner. Do you know what that plastic tube is called? I broke it and need to buy a new one but I don't know what it is called. Thanks.

[@sethsmith8766]

Do you have to take the throttle body off? Looks like I could just unplug it and still remove the intake. Can you confirm this?

[@SK-xr7up]

Great Video, can you please link the gaskets for manifold and for the throttle body?

[@SK-xr7up]

Also, should we always change the gaskets?

[@jesusramirez5351]

Do you have to replace the intake gaskets. Is it one set or 2 What’s the spark plug gap supposed to be. Just to be sure

[@robertmyers6859]

FANTASTIC

[@tom24gr46]

do you have to change the gaskets if they are in good shape??

[@eddiebowman1072]

With the current parts shortage I'm having trouble finding the upper intake gaskets, is it possible to reuse the old gaskets and how big of a risk am I taking? Thanks for the great video!!

[@HowtoAutomotive]

There’s like a 95% chance you’ll be OK reusing the old gasket. The worst thing to happen is you’ll have a vacuum leak. If it’s a bad leak it won’t run very well at all and you’ll know right away. Or it could be minor and I set a code lean running condition. It’s worth trying 👍

[@clutchassassin9350]

Okay so I did all of this without watching this video but I have a question. I ended up with an extra bolt that is the same as the bolts holding down the spark plug coil 8mm bolt except it is half as long. Any ideas where I took it out of?

[@alanperry8676]

The first model year for the CX-9 is 2007. It had a 3.5L engine during that first year.

[@smith6098]

Assuming no broken or cracked connectors during this process, what's the ballpark for how long this will take someone who is moderately handy?

[@justt9507]

Thank you for walking us through step-by-step. Just got one question. What did we forget To put back on or attach. When we go to drive it basically. Doesn't wanna go like no power. Can you help me with that before? I start taking it all back apart and go into it again

[@HowtoAutomotive]

The only thing you can do is pull codes and go back over your work.

[@justt9507]

@@HowtoAutomotive Will do Thank you for replying and again great video

[@reynaldorivera1029]

Can you tell my wats the name of the plug that is connected behind the intake monifold

[@billbeckett1021]

Excellent vid, you explain the repairs very well. I like your underhood light. Is it a Milwaukee?

[@HowtoAutomotive]

bill beckett thank you! Yes the light is a Milwaukee M12 underhood light. There is a link for it in the description if you're interested in checking it out.

[@danielarroyo121076]

Are you around ct

[@danielwakefield671]

My only issue was a wire and plug not mentioned on the intake which killed me as I ripped the wire right out of the plug while shifting the intake to get to the last hose.

[@thebabasaccount-donttouchi5442]

this was awesome. Thx a lot

[@HowtoAutomotive]

Thank you for watching!

[@thebabasaccount-donttouchi5442]

thanks a lot, great video.

[@HowtoAutomotive]

Thank you for watching!

[@maolo76]

Man..was going to do my self. Looks like a lot of work and time.