Why Cylinder Deactivation Can Cause Engine Failure

[@bendeleted9155]

GM's efficiency tech is to shut down cylinders until the tow truck is doing all the work.

[@tyroniousyrownshoolacez2347]

Nice! 😂👊👉

[@speedkar99]

Lol

[@mr.santos5205]

😂

[@MrSamPhoenix]

LOL

[@andromeda9340]

💀

[@drewwill2650]

You're like a well-educated tour guide showing us everything about the engine. Cool.

[@speedkar99]

More to come thanks

[@footballera-i2p]

​​@@speedkar99 are other cylinder deactivation system this bad? What can you tell us about VW and Audi cylinder deactivation systems as well as chevy tahoe or suburban cant remember which one had. Are they any good? Thank you in advance. Honda vcm is so complicated

[@catsspat]

The feature deactivates cylinders... for good. ;)

[@BowWowPewPewCQ]

A great explanation and demonstration about VCM. Don't forget the age old problem of thermal difference on the deactivated cylinders. Something that plagued the Cady V8-6-4 and all others that attempt to switch off cylinders. You can't fool physics. The VCM on my 2019 Ridgeline was disabled very early on using more of a "smart" manipulation of the temperature feedback. Normal "pass through" at low and overtemp situations, but not allowing normal VCM temps to be reported. It also varies the output just enough to prevent a "flat line" record if anyone looks at the logs. My model version also has direct injection only which compounds the carbon situation by not having any valve washing. These engines have injector issues, carbon build up issues, motor mount issues, and now rod bearing issues (recall) which BTW are on the rear bank. The body is also prone to water leaks. IMHO Hondas are not the quality they once were. As the complexity of cars increases it seems the tech skill level is simultaneously (generally speaking) decreasing. This creates a real double-whammy problem for the consumer. Maybe I need something carbureted with points and a 4 speed? 😄

[@augustcleavitt]

Seriously Agreed. Been wishing occasionally that I still had a much simpler and yet way less fuel efficient vehicle… I really just want sh** that works and isn’t designed to fail, via EPA and other regulations by the government. They’ve had tech to make internal combustion engines way more efficient for DECADES and only recently instituted it when it’s no longer as fashionable or profitable to the oil and gasoline companies to not allow it to be used… and the powers that be know what’s they’re doing all the time. But they can’t drive us all the “unneeded” people into oblivion if they don’t take over EVERYTHING we need to survive and ruin it and make us (they think) completely dependent on them/ their governments. Makes me even more glad to know this world is not my home, by God’s grace through Christ alone!

[@saptarshichakraborty8140]

Thank you, you're 100% factually correct with this. I'll go with Sienna instead of the Odyssey's V6 VCM.

[@NikMitchell]

This is a GREAT comment!

[@cdbuiles]

which device did you use to disable VCM ?

[@rickkephartactual7706]

You speak fast and clearly, in addition, you cover a lot of information in a short period of time. Very impressive.

[@A.R.77]

Imagine what he could do in a heated garage. Brass balls, our man here.

[@PlainlyDifficult]

Great video as always!!

[@speedkar99]

Thanks

[@fluffyty19]

Wait what? Did not expect to see you here, Plainly Difficult! Love your channel!

[@mrdumbfellow927]

Colliding interests yay

[@colchronic]

Wait, wtf are you doing here m8. 😂

[@PlainlyDifficult]

@@colchronic Im everywhere!

[@brucebowman9087]

I have a Ridgeline and I've been trying to understand the VCM problem and to decide rather to install one of those VCM killer doo-hickies. This video is BY FAR the best explanation out of the 10 or 15 vids I've watched. Thanks!

[@Radwinskee]

Hi, what year is your Ridgeline? Did you end up putting an S-VCM? Thanks!

[@Busydadgarage717]

I have a 2013 odyssey. Was having the rear plug issue bad. Had to resort to the VCM disabler. I have had it on for 2 weeks and the difference is AMAZING. It now runs like a proper Honda!

[@duaneafields]

Hi. please tell us the product model name for the vcm disabler or a link online where you bought it. thanks.

[@hallmonitor98]

what was the odometer reading before you put in the disabler?

[@Busydadgarage717]

@hallmonitor98 around 135k I think. Been over a year now and still running great.

[@mikedgenx]

@@Busydadgarage717I just installed mine today. 24 Ridgeline 1k miles. Hopefully this will prevent possible future problems.

[@thehumbleonez977]

That engine was in pretty decent shape, you make this look so easy.another great engine tear down.

[@nickwind2584]

He looses me after the first 5 minutes of what’s going on, but I still feel smarter at the end of his videos than the beginning. Love it!

[@speedkar99]

Why did I loose you? Boring?

[@nickwind2584]

@@speedkar99 lol, not boring. i just wish i was as smart as you. i will get there. i just need to watch more videos!

[@aaronsmith5433]

@@speedkar99 noooo, not boring, whose toothbrush you took made you think that? You are A number one teacher. It's our fault if we get lost. Me, I started thinking, imagining your take on Citroen ID 19 with non-electric hydraulic ABS computer that used the weight of the car when braking to achieve equal quadrant patch pressure even down level of air pressure in the tires. In fact the springless all hydraulic suspension allowed for driving on 3 wheels if necessary. All that in 19"frigin"55! Yeah, over 3/4 of a century ago. No , commie leftists eco-over-engineered fail design whatsoever. Check out the late 50"s and 1960's ID& DS citroen (later they got taken over and "takin' out" by dreamkillers & conformity to lower standards.

[@EvilXtianity]

*lose

[@cisvaughan6937]

Problem is actually talking so fast without drawing breath. Nobody can take in information at that speed. I know it's the fashion now to talk fast on KZbin, but we actually need easy -going speech, with gaps for assimilation of knowledge. Please reflect this back to KZbin!

[@sportyhuntley8914]

I've used a device called, "S-VCM Controller" every since I purchased my 2008 Accord v6 at 165k. It tricks the computer into not engaging the cylinder deactivation. I now have 260k and no oil burning issues at all. I'm not sure if the piston rings were replaced under recall by the previous 2 owners before me, but I've witnessed a v6 Honda Accord switching from ECO to normal mode while operating and a plume of smoke coming out the tail pipe every time. I did my research before purchasing this car & it paid off! I am not disappointed at all. During my 3 years & 100k with this car 0 major repairs. I'm glad I purchased the "S-VCM Controller.

[@TaylordBuDMaN]

I'm about to do the same with a 2 dollar resistor, hoping it works...

[@sportyhuntley8914]

@@TaylordBuDMaN Spend the money on the smart resistor. It's worth it.

[@timbucker]

I did the same with our RDX and it works great!

[@sportyhuntley8914]

@@timbucker It's so seamless! I often forget it's installed.

[@Amdfan900]

S-VCM is the truth! 2010 Accord v6 Ex-l with 180k. It made it feel like a whole different car.

[@jimmyjames2549]

Whoa whoa... your brother was probably still using that toothbrush!

[@vuhuynh702]

=))))))))))))))))))))))))))))))))))

[@medic6yaeta254]

That's nothing, what till his old lady finds out that's he's been using her bra's to hold the brake calipers up when changing pads & rotor's 🤕

[@BryanChance]

Amd his pants and whole bunch of other clothes. Lol

[@zul]

Rofl

[@digitaldemetri2404]

I used to go to the scrapyard and explore different engines for fun. Thanks for these videos

[@speedkar99]

Awesome, I do the same as well, browse the junkyard and take a look under the hood of interesting cars

[@caveman_period6282]

EXCELLENT VIDEO! I could see exactly how this system works and why there could be problems related to this system in the engine. I really like the short cuts when disassembling the engine. Saved time . 5 Star video. Thank you very much indeed.

[@zepmarq]

You totally do an amazing job explaining how each different engine works. Hands down, your vids are the best 👍

[@ColonelK0rn1]

The most concise explanation that I've seen on how the VCM is a bad thing. Thanks!

[@speedkar99]

Agreed. Don't get it

[@davidvang763]

Very informative video and excellent tear down. We got a CPO 2015 TLX with 40k on it for my wife back in 2018. While doing my research, I disabled the VCM using S-VCM. Before installing the S-VCM I did get the annoying vibrations from VCM activation at certain highway speeds. The car now has 99k on it and it drives like a dream. Given I do my own oil changes when the oil life hits 30% (4,500-4,700k miles). Finally scheduled to get the connecting rod bearing recall done next weekend.

[@speedkar99]

Awesome! What's involved in the bearing recall? Inspection?

[@LAP1050]

Excellent video showing the wear damage caused by the VCM 👍 AND that is why mine is deactivated. Thanks for sharing

[@MX-CO]

Yes deactivated with VCMUZZLER on a Honda

[@skismosis]

@@MX-CO hey there, i have a 2005 honda Accord EXL, how do i deactivate it ? it is a LEV , low emmission vehicle, is that the same thing ?

[@BowWowPewPewCQ]

@@MX-CO I prefer the S-VCM over the muzzler. Zero tuning/tweaking or seasonal adjustment. It also will correctly report any over temp. Don't forget adding a catch can.

[@dolphincrow]

@@BowWowPewPewCQ what’s a catch can and do you notice you’re spending more on gas?

[@nunyabizness9216]

​@BowWowPewPewCQ what is a catch can and what does it do?

[@tigerseye73]

I like all your video's. You possess a wealth of knowledge about all these modern overly complicated prone-to-fail engines we have to deal with today. Makes me want my old slant six plymouth back.

[@ONeal397]

I have this engine in my Accord. I burn 1 quart every 5000 miles after a rebuild at 116k miles

[@speedkar99]

Ouch. What year?

[@ONeal397]

@@speedkar99 2010

[@egafx]

5000 miles per quart

[@Techie1224]

thats not much bad but its better to install oil catch can if you dont have one to keep your intake clean

[@ONeal397]

@@Techie1224 I change my oil every 5000 miles and I'm mostly highway driving

[@sagnbaby]

Straight up TROOPER!! I would never work on something outside in those weather conditions!!! My hats off to you buddy!!!

[@speedkar99]

Well it's too bad it's even colder this week....I don't think I can film next week's video for you guys 😓

[@ODamoo]

Darn, thats transference, from hole to port to channel to piston to lever to rocker to .... aaaahhhhhh ..... Did anybody tell you yet?? You are a genius, cutting through these ordeals like it was butter ... Amazing !

[@speedkar99]

😊

[@Mrdubomb]

Excellent video, in theory the combustion pressure is what helps to push the rings against the walls, so without that positive pressure the oil does get sucked past the rings into the combustion chamber. It wouldn't surprise me that that is the very thing that aligns the rings over time. A local engine rebuilder who builds the 5.3's with the AFM system states that the rings on the deactivation cylinders are always glued to the pistons. Its a horrible invention and it needs to be defeated on every vehicle that it comes with. Had I known about this system I would never had purchased my Honda, and I strongly recommend anyone considering a vehicle with cylinder shut-down to NOT purchase one. I'm not a fan of the original coolant temp VCM defeat method, unless it is the smart version. Even with this muzzler the VCM can still come on in higher temp weather. I would like to see a better method invented like a custom engine tune or custom PCM that could be purchased.

[@i-changeus]

Hi, have you seen the S-VCM controller? I appears to fix everything except being about 10% cooler on the thermostat reading. I am a new honda owner, kinda concerned even with low mileage.

[@jasonschell1309]

@@i-changeus I'm new to this as well. Have you looked at the KTuner? More expensive, but it programs the VCM to stay off, as opposed to tricking the computer to think its Coolant temp is lower than it actually is.

[@jerryp2433]

VW Taos has VCM. Seems like a cool car but I prob won't be buying one after watching this.

[@i-changeus]

@@jasonschell1309 Thanks for the idea, and yes, I looked briefly into it, but as you mentioned, it's like $400-500 from what I found. I did instal the S-VCM, and it works great. The coolant temp is only slightly cooler than actual. I put a switch on the dash too, so I can switch on/off if desired later.

[@Norm475]

I had the 2007 Odyssey with the VCM engine and I never had any problems with it, I traded it in when it had 57,000 miles on it and purchased a 2015 EXL with the VCM engine. I installed the Tuner 2 on that car and the ECO mode is never engaged. Anyone that has a Honda should join the Ody club and you will learn everything about this engine and why you should turn off the VCM feature. I only have 29,000 miles on this Odyssey and since I am 80 Years old I will probably keep it until I croak. I was looking at a new vehicle, but now they are all coming with that idle stop feature and I hate it.

[@legalcriminal5730]

This crazy man always comes with new fantastic knowledge. I really enjoy every video... Thumbs up 💓

[@PedroBarbosa-qh6hy]

This could be the only car guy to be sponsored by Colgate. Loved the video !

[@TheArtphuldodger]

I believe that’s an oral-B

[@whyzecoin1248]

😂😂🎉🎉

[@MoonLight-zu6zc]

No brothers old gym shorts? No wifeys undies to sap up any oil????

[@speedkar99]

Shoot I knew I missed something

[@emmanuelavendano451]

I’ve been trying to search exactly how the cylinder deactivation works on the V6 engines (I’m well aware how the v8 engines work with cylinder deactivation ) and your video has the best explanation. Thank you

[@josephpatricio851]

Great information. I have a 3.5 l with cylinder deactivation so this video was very useful to me.

[@grebo121]

Urban legend says - every time one says a 417 000 km engine is a failure for Honda - an Eco-Boosted Mustang -guy, attempts suicide.

[@RadioWerwolf]

417.000 km and was rebuilt in the meantime.

[@medic6yaeta254]

Your knowledge and simplistic way of explaining the complexity & workings of an engine leads me to conclude not only are you an technical engineer but also an educator of such👍🏾🍻.

[@speedkar99]

Thanks. Im not a teacher, just mechanical engineer

[@darksu6947]

@@speedkar99 I disagree, I've learned a lot. Thanks dude!

[@Furudo]

I disabled VCM on my ‘08 Accord at around 80k miles. Thankfully at 172k it doesn’t burn a single drop of oil.

[@Techie1224]

someone called henry in comments wish to disable it , if you have useful info you can tell em 😊

[@SomaliDibJir]

How did you disable it?

[@reyperez3424]

@@SomaliDibJir Look for vcm muzzler or S-Vcm If the j35 is running below normal temperature the VCM would not kick in

[@lars25gdl]

@@SomaliDibJir ktunner... thats the right way.. no gadgets that will trick your ecu ...

[@donaldlee6760]

I'm at 88k miles on my 2012 Odyssey. Which VCM muzzler did you purchase?

[@AK-Star007]

I had only heard of VCM, today i got to see it and with nice explanation plus causes of failure Thanx

[@frank.l181]

VCM works at idle and light load cruising speeds for great gas mileage. I think the problem might be the use of low tension oil control rings, with a high mileage engine it may use a bit of oil to foul the plugs. The number problem is not changing the PCV valve before 50,000 miles if it goes bad it will suck in oil. I change my oil when it hits 20 % oil life.

[@ronniejr1983]

Can I send you my old toothbrushes. I’d love my brush to be featured in your videos lol

[@Techie1224]

lol

[@mr.santos5205]

😂😂

[@carlosmejia5728]

Nope.... you've gotta send your brother's toothbrush

[@kiiiisu]

@@carlosmejia5728 LOL

[@monkmodemalik8225]

Thanks man. This guy was saying how his gas mileage is great because on the highway his car runs on 2 cylinders, but I’ll stick to my 1995 diesel which gets the same mileage with no fancy electrics

[@drscopeify]

It is very odd how Honda can pull off such a failure when at the same time and same year pull off some of the best engines ever. The J35A5 I had in my old 2006 MDX was so far the only engine that burnt 0 oil even at 200k+ miles towing an RV on very long road trips like 8000 mile trips and the oil was still full at the end. The run after more MPG just lead them to making errors it seems.

[@MX-CO]

How heavy was the camper?

[@2006gtobob]

November 4th 2020 my 130,047 mile V6 experienced its failure. ALWAYS used Mobil 1 products specific to the car, changed every 6k miles. I get in the car that morning, on the way to work, and I heard a metal on metal banging noise. The car was still running, seemingly fine. I had no choice, so I drove it to work and then straight to the shop. I got the bad news the next day, rear cylinder head...done. My guy found a 81k engine and in it went. I bought a 21k mile Arizona off lease 2017 v6 immediately as well. Hopefully the 2017 with its changes has engineered this problem out.

[@speedkar99]

Interesting. How old was your car?

[@JoeUrbanYYC]

I've been wondering at what point did emissions equip start to become detrimental to longevity. This seems like a good candidate. Any idea when this was first implemented by Honda?

[@speedkar99]

With this same engine, 2005 Accord hybrid and the Odyssey

[@StephenPaul1160]

I believe this is more to keep up with CAFE standards than for emissions purposes. en.wikipedia.org/wiki/Corporate_average_fuel_economy

[@JoeUrbanYYC]

@@StephenPaul1160 yeah you know I said emissions but yes it's more efficiency than emissions like you said

[@JohnS-il1dr]

CAFE ruined it for car owners. CVT, Direct injection, Unibody construction, VCM

[@yehudagoldberg6400]

It's affecting the longevity of everything. Brake rotors are thinner so they can be lighter but warp more easily. Glass is thinner but chips and breaks more easily. It goes on.

[@jascam1]

Man you're good, you sound as if you were part of the design team at Honda. Great video.

[@ardyjuniorcars9020]

You know yr day is cool when you get a notification fr this channel

[@speedkar99]

Thanks for subscribing

[@matrixist]

What is insane is that Honda didunderstand the problem yet still produced this engine. WTF?

[@sonatahybrid]

Excellent video. I muzzled my Odyssey's VCM long ago and it was the best thing I did for that engine.

[@speedkar99]

How many miles and any Ill-issues?

[@perverso12345]

How did u do it?

[@sonatahybrid]

@@speedkar99 Over 50,000 miles ago and no issues whatsoever. It just tricks the VCM into thinking that the van isn't warmed up fully for the VCM to engage, keeping it running on all 6 cylinders all the time like it should be...

[@sonatahybrid]

@@perverso12345 I got the MaxMuzzler on the Honda Odyssey forum, but there are a bunch of them out there now.

[@pilot2020]

I disabled mine at 40k in my pilot I have 190k no issues.there still Piggies on gas but it stopped the shutter on my transmition and vcm vibration back at 40k no 190k and before I disabled it I was burning oil by 1 quart by 40% .when I disabled it it stopped burning.i also do all my own services ,oil changes ,all fluids brakes,diff services ,plugs and timing belt which is up soo I'll do it on 195k.best thing I ever did.my friend didn't want to do it and he has so much trouble with engine right now at 110k .I told him I'll install mine and he drove around for 3 minth and a lot of his issues went away engine sounded better vibration gone trans skip at 2k was gone all and he did a full oil change and it was down half quart compared to 1.5 quarts by full oil change .he was convinced he got one and 3 of my friends techs are honda recommend them tech for 15 yrs now

[@gregorymark6014]

This is part of a comment that I made regarding this issue on another channel. "2015 Odyssey. VCM on since new. Works great and saves gas. No oil consumption according to the dipstick. Oh yea, I change my oil between 30-40% on the less than adequate maintenance minder, not the 15% that dealers recommend." Good chance that you hit the nail on the head talking about oil quantity and quality. I pay the seeming ridiculous price for Genuine Honda Oil at the dealership. Maybe worth the price? Will hit 200,000 miles on the vehicle soon, probably this week. Spark plugs were clean and in great shape when I changed them at 110,000 miles.

[@speedkar99]

Maybe. These newer Honda motors aren't as good as they used to be

[@IronFishChannel]

Love how many engines you take apart seem to have those Fram filters! Almost like there's a correlation of some kind.

[@toniviudez6371]

Excellent explanatory video about VCM. Thanks making it possible.

[@MrSamPhoenix]

Great video, I’m hoping Honda/Acura made advancements to their VCM tech. We have a 2017 Honda Accord V6, & I change the oil religiously every 3500 miles with the best oil. So far, no oil burning or troubles from the engine at all. Now the daytime LED headlights are another story...

[@speedkar99]

Keep up on the oil. The 2017 is the last of the V6 Accord.

[@MrSamPhoenix]

@@speedkar99 - Indeed, & I love the power & smoothness of this engine. I hope in another video, you’ll show the different versions of the company’s VCM. Love the videos man!

[@georgesmith4639]

You should also change the transmission fluid more often than Honda says if you want to still be driving it at 250k miles. I have a friend who knows Honda engines and history of problems and he drains and replaces his every 15k miles. I just got a used RDX and will change mine every 30K miles minimum unless the service tech says the fluid looks bad and then Ill move to 15k miles.

[@MrSamPhoenix]

@@georgesmith4639 agreed, we have multiple Honda/Acura vehicles. And I personally do a drain and refill of the transmission fluid 3 times a year.

[@georgesmith4639]

@@MrSamPhoenix I saw on another video today that there's a transmission fluid filter that also needs changing (I think every 30k miles). It's located way down below the battery. Just curious if you change that as well and how hard it is to do from the top side.

[@healthyamerican]

I hope someone starts a class action lawsuit against Honda for this vcm issue. We just had to spend $5000 on engine work because of this issue. And our 2012 Odyssey only had 88k miles on it

[@paultruesdale7680]

There was a class action lawsuit filed against Honda for this issue, you’re should have been covered. Please don’t buy any vehicle that utilizes this technology.

[@peters1821]

Good explanation! It’s very important to use good synthetic oil in these engines. That way build up is less likely to occur.

[@speedkar99]

Yeah synthetic helps but regular oil can work with frequent change intervals

[@quintonulm2435]

Glad we cheaped out on our 07 Odyssey when we bought it and just got the 3.5 VTEC without VCM

[@speedkar99]

Good choice. Should last for years

[@quintonulm2435]

@@speedkar99 we’ve put 160k miles on it. Engine will outlast the car.... and the transmission

[@paulwilhelmsen6586]

Quick qualifier, I’m a Honda technician, while I agree that the VCM system isn’t perfect; I literally did piston rings on a 11 odyssey today, that discoloration difference between bank 1 and 2 is very common, and not due to a rebuild. Like literally virtually all 6 cyl Honda motors are gonna look night and day different between bank 1 & b2. Bank 1 is always 10x nicer looking then bank 2. I’ve asked 2 master techs I work with why that is, I’ve heard different theories, one is the path of the oil, the other is that bank 2 runs hotter because it’s always live (for the most part, cyl 4 can deactivate also)

[@speedkar99]

Good to know that. Even non VCM motors have that color discrepancy. How long did it take to finish that Odyssey?

[@paulwilhelmsen6586]

@@speedkar99 embarrassingly long. Original complaint was a b1 & b2 tw-wuc failure, turned out it was due to oil consumption fouling the cats. So it booked out at 27 hours according to Alldata , that’s 22.6 hours for 4 out of 6 piston ring sets then 4.4 hrs for both cats, we thru in a t-belt service that included water pump, belts etc concurrently to shave off 4 hours but still, it was pricey. It was about the biggest job you can do on that engine before it just becomes cheaper to find a used engine. Client was very cool, took me about 20 hrs to do the 27 hrs labor, that’s including valve adjustment (Honda’s don’t use hydraulic lifters) coolant flush, oil change etc. I wish I could post a pic of the four pistons I removed, cleaned and reinstalled with new rings. From the top, they looked like new (yes, I know you don’t have to go all OCD when cleaning the pistons but for 20+ hours labor, I’ll spend 1hr scrubbing pistons in a bath of VOCs :) As for the original question about discoloration, I’ve seen it all the way back to the first gen pilots and odyssey’s, so my theory is that the way the oil flows, it’s just hotter, more likely to leave deposits by the time it’s draining down the passages in b2, but again, that’s my guess, I have not had that confirmed by any Honda engineers.

[@paulwilhelmsen6586]

Edit* I meant the same time frame odyssey’s, I realize they go back way further*

[@XMguy]

I’m surprised the piston connecting rod doesn’t snap with that vacuum build up. I had a lawn mower engine piston fail from clogged air intake.

[@vipersqueal]

Awesome video. I feel armed with knowledge. Going through this ring and misfire dance right now with my Honda Pilot 2011 :/

[@speedkar99]

Use a vcm muzzler

[@jooky87]

Impressed your able to work out there in the cold bro

[@ZayedGR]

What if we unplug vcm solenoid does it hurts the engine or any damage to the engine???

[@Balmy_Jones]

Wow. Incredible review. I've ordered a VCM muzzler. Google reviews show not mpg benefit to the VCM... all must EPA hooey. Terrible what the EPA has done to Honda.

[@ShaoyangJia]

To solve the problems from single-engine VCM, one might want to consider two engines independently driving a two-input transmission through a plenary gear set.

[@heathbauerle2787]

Hybrids

[@speedkar99]

Agreed

[@arunkumarindian]

Does 4th Gen Honda Pilots have same issue? (2023 / 24 models)

[@pcnepal]

Is it possible to adapt VCM to non-interference engine with the intake & exhaust valves open during cylinder shut down? This case the inactive cylinders would not have compression and vacuum to cause the mentioned problems.

[@Jon-yh3gb]

Interference vs noninterference is unrelated. Leaving valves open would increase pumping losses. Basically half the engine would be engine braking and it would make vcm even less capable of improving emissions. It would probably be better to go with a super nonaggressive cam (targeting half power) for all 6 cylinders in eco mode and "vtech" back up to normal cam profile as needed. Should result in smoother power delivery and keeping even stresses and even heat throughout (metal expanding unevenly is bad) since it would still rely on their vtech style implementation it should be fine from a patent perspective. My guess is that vcm was one of those marketing based engineering decisions. Might be easier to explain "sometimes 6 cylinders" than "echo vtech"

[@knipsi22]

@@Jon-yh3gb It is not unrelated. Think about that idea. It would work! Whole engine would have a low compression ratio tho.

[@pontiacg445]

Leaving the intake and exhaust valves open would not really work on 99% of cars that have a shared intake plenum. The intake and exhaust would be directly linked all the time through the dead cylinder, bypassing the throttle and killing intake vacuum for all the cylinders still working. Maybe you could make it work on a car with individual throttle bodies and exhaust, but I doubt it.

[@lastfirst5863]

So what I’m getting out of this is VCM is something to be aware of, but since I changed my spark plugs 20k miles ago and so long as I keep up with oil I shouldn’t worry about it too much. The only thing I’m concerned about now are the mounts lol.

[@speedkar99]

Disable VCM

[@Skyline70019]

​@@speedkar99please can you do a detailed video on how to disable the vcm, I cant seem to find any

[@alannguyen5050]

Thanks for taking the time to do all of these really awesome videos! I just learned that my dads 07 EX-L Odyssey has VCM from you. I've been changing the oil with full synthetic high mileage every 3-5 thousand miles and the van had a rather big oil leak from the valve cover gasket. I put a 1/4th a bottle of AT-205 and that completely stopped the leak. After that I changed the sparkplugs after a Cyl. 2 Misfire code at 145k miles, I used some NGK Iridium plugs but I am noticing much worse gas mileage, would I have to disconnect the battery to let the computer relearn the new spark plugs? I dont think VCM is a huge issue in our case since my dad drives pretty fast, and the Eco light hardly ever goes on at 80mph. I think VCM only kicks in at 70mph and below

[@speedkar99]

Why not fix the leak?

[@alannguyen5050]

@@speedkar99 Thats too much work for me haha, but I did learn how to rebuild the parking brake from your video! Totally saved my cousin and I when we were changing the brake rotors and realized that the rear right rotor was not disengaging the ebrake so we had to hammer the old rotor out at 10pm Thanks to your video and AutoZone for having the kit of all the included springs we were able to finish by 12am! Youre awesome man and I watch your videos as much as I can!

[@Norm475]

Great video. I drive an Odyssey and I deactivated the ECO mode.

[@speedkar99]

Good idea

[@DashCamSerbia]

It is not like they didn't know how it would behave, even in theory. But they had to do it for the stupid emmission laws written by clueless politicians. Future of car industry is not looking good.

[@rokas8594]

If not for these "supid" laws that car manufacturers have to comply with, your car would probably burn twice as much fuel. This solution is bad, but there are other engines from this era which run for 1 mil + kilometers without any major issues while still complying with the same laws.

[@DashCamSerbia]

@@rokas8594 Wrong. I am not talking about normal laws and regulations. I am talking about these new ones, that are written by idiot politicians that have no idea about technology and industry. For them it is easy just to say, from now on engines must emmit 10 times less CO and CO2. Well, it is impossible. It is not alien technology. You can ask 2 times less, and maybe that can be done, maybe. But they are clueless about anything. Never mind that cars are responsible for only 5% of pollution or so. Forget about the coal power plants, that are the 50%. We must ban cars (so I look green, and get elected again).

[@rokas8594]

@@DashCamSerbia there is some truth in your statement, but then again, I firmly believe that this is exactly what drives progress. There was once lead put into gasoline and a law was written to ban it. You think car manufacturers would have voluntarily reengineered their engine lineups to make them run on unleaded? To be honest, I highly doubt it. Maybe it seems impossible now, but in some time it will be done. And hey, cleaner air in cities is a good thing, no matter what anyone thinks about global warming. Back to your original statement, your comment on this particular case of breaking down honda engine implies, that you were talking about some older law, this is not a new car after all.

[@Snelliscool]

You sound so dumb . It's planned obsolescence, politicians dont care about saving the earth 😅 why do you think they haven't made a law on private jet travel .

[@HyproTube]

I'm so glad I wasn't the only one that immediately thought: "oh look, that's a weird smiley face". Fantastic, educational, well-presented content. Keep up the good work.

[@kerrythompson9506]

Excellent video, as usual! Nice pace, good information! It seems that fooling the computer into thinking the engine isn't warmed up would cause it to run open loop (as if the choke is on) which would cause it to run rich all the time (poor mileage, carbon build-up, poor cylinder lubrication). I also thought maybe one of the failure mechanisms might be when the back three cylinders are reactivated, re-engaging the pistons in the rocker arms might be a little dicey with the stationary rocker arm piston trying to engage a fast-moving part. But the oil-burning bit - ugh! Seems like it might be better to hold all the valves open, but then that would introduce other problems unless maybe there were separate intake and exhaust systems...

[@wiimaster2847]

That's not actually true. The VCM disable devices only slightly affect the reading out of the ECT1 sensor. The ECT2 sensor is left alone. It's been found to have no negative affects.

[@marks6072]

'21 Ridgeline... Installed VCM defeat module at 5000 miles.. Thanks for the explanation...

[@Techie1224]

i really like your videos .. its deep technical and informative 😊

[@htpcnz7378]

Very nice explanation as usual, I always thought all VCM systems worked fully electronically by just shutting off fuel / spark to cylinder(s) ECU wants to deactivate and letting mechanical parts keep going as usual.

[@speedkar99]

It might do that while coasting to a stop and engine braking

[@willdavids7075]

Great explanation with all the details!

[@speedkar99]

Thanks

[@rodrogers6895]

Used S-VCM that we bought for 100 bucks. Solved the problem by fooling the computer and disabling the deactivation system. Works great.

[@speedkar99]

The resistor?

[@gsxr05cd]

I have one as well and so far it's doing its job.

[@parvanalexandru4041]

Great explanation :) better than what you learn in school

[@speedkar99]

School isn't for learning

[@A2Wx8]

My boss got a total engine rebuild on goodwill from Honda at 75k miles on his Accord when it kept fouling out the third replacement set of plugs. Though after that and a software update he's gotten over 130k with no issues so it looks like they may have figured it out or at least gotten it a lot better.

[@speedkar99]

So they honored the warranty

[@daw7563]

Why did they not let the exhaust valves open (leave them partly open), and use a separate exhaust perhaps? It would get rid of the issues.

[@trexmidnite]

How about a chimney..

[@pizzablender]

Or the intake for that matter. The valve rockers still ride the camshaft, and a minimal opening with the right timing will generate positive pressur in the cylinders.

[@daw7563]

@@pizzablender I think they want to avoid vibrations and wasting energy on compression. But keeping the exaust valves partly open (during all four strokes) would do the trick.

[@farquadmantis8486]

They keep the valves shut because the air acts like a spring. If the valves were open you'd lose energy moving air in and out of the cylinder. A spring stores potential energy when compressing the releases the energy when the piston goes back down.

[@erubielalanis6658]

I did a tune up on my 09 Odyssey 1 year ago, I just got a misfire on cylinder 1 the other day and when I pulled the plug it was completely caked with oil. I'll have to do another tune up and I'm buying the device to deactivate the VCM.

[@i-changeus]

Hi Speekar, Great explanations as you go a bit more indepth! Question, have you seen the S-VCM controller? It appears to fix everything except being about 10% cooler on the thermostat reading. I think this VCM is a big opportunity if it is 'solved' as there are so many Honda 3.5L's. Thanks Speedkar.

[@Symbolizer21]

I have the svcm in my accord, works beautifully. From what I remember it only modifies the signal in the running temp range and passes the true signal through for any other temp and that seems to be my experience. And it's very easy to disable with the 12v power wire that feeds it. In power loss it becomes passive all the time and just passes the true signal through. I still need to do the rings and cats on my engine but the oil consumption has plummeted. From 5-7 qts between oil changes down to just 1-2 qts, which I attribute to the rings and the valve cover gasket leaking. Still need to clean the spark plugs at each oil change but it's better than needing to replace them all the time from a misfire. I'm a very happy customer.

[@mitchgrossman7447]

Great video, thank you. Would you recommend, if car is out of warranty, installing one of those VCM disablers with the goal of extending the engine life? My 2011 Pilot has 145k on it and that rear spool valve went at 110k. Had to be towed to shop to fix

[@rotorblade9508]

The only solution seems to be cylinder deactivation deactivation :)

[@speedkar99]

That muzzler idea doesn't seem so bad

[@accordinglyryan]

Disabled VCM with Ktuner on my 2017 Accord Coupe V6 at 6,000 miles, haven't turned it back on since. At 59,000 miles now; the engine doesn't burn a drop of oil.

[@speedkar99]

Awesome! So that's all software, no need for resistor?

[@accordinglyryan]

@@speedkar99 Yup! Just an ECU reflash. Technically the only "correct" way to do it

[@keithrichardson6973]

@@accordinglyryan yup 👍

[@Jakek200]

And then we've got GM's AFM (vcm equivalent) that loves to burn oil (especially the earlier ones), destroy lifters, chew up camshafts and bend pushrods.

[@speedkar99]

Yeah those we're pretty bad at it too

[@davidcox2197]

Ah, the wonders of modern technology, reminds me of the engines of the 80-90's emission control laden junkers. So much unnecessary extra parts. In the end its all about AFM coking the rings is what causes demise of AFM engines, first rings slowly coke up with carbon from unburnt/burnt oil in the cylinders, then rings freeze and the massive oil consumption begins. Leading to eventual rebuild all due to AFM systems. You cannot turn off lube to the deactivated cylinders or would score cylinders, a viscous circle for sure.

[@AlpineWarren]

This is a great overview... I just bought a 2020 Ridgeline and I am going to put a VCM tuner ASAP and disable this garbage.

[@OnTheEdgeNow]

Thank you for these very interesting videos. It is pretty neat to be able to see these different systems torn down. It makes them much easier to understand. Your explanation is spot on. The only thing I feel bad about it your poor brother. He must spend a fortune in clothes after you borrow them to clean up oil spills.

[@speedkar99]

Glad you find them interesting

[@The_Dastardly_Dan]

It's honestly much more reliable then people realize. They had piston ring problems sure, but honda fixed that. Beyond that it's as simple as change your oil, do an intake service from time to time and don't overtax any car. The real killer of the V6 hondas is the torque converter, the lock up clutch causes shutter if not maintained properly with the recommended fluid changes. When I worked as a honda tech I saw tons of bad torque converters in the V6 cars.

[@speedkar99]

How did they fix that in the newer models?

[@frank.l181]

I change the fluid every 15,000 miles, the is also inline trans fliter that should be changed at 50,000.

[@dc5723]

I'll never buy a car with cylinder deactivation.

[@donaldlee6760]

There is a cheap and easy add on to permanently turn it off - look up VCM muzzler.

[@johnmitchell8925]

You will soon be forced in everything

[@javaman2883]

The electric cars are coming, they will be mandatory before cylinder deactivation crap becomes standard.

[@roostersideburns3440]

@@donaldlee6760 ever for the new mazda skyactiv engines?

[@GigachadLazer]

Watching this video has convinced me to get a VCMtuner for my 8th gen Accord coupe v6 because I do notice that my car is eating oil fast I've only had it for 3 months only drove about 500 miles, and oil life went from 100 to 80

[@kurokaien18]

Is that a product you buy? And if so where? I’d be interested in getting one

[@1g2002541]

Great Video! Are they still use VCM on newer honda v6?

[@andybub45]

Yes, but I believe the issues have been somewhat fixed

[@aseemagarwal6040]

Newer like which year?

[@tronarat]

Traded in my odyssey with vcm early version supposedly the worst with 200,000 miles on it never had any issues, now have a passport with vcm3 and I have no worries

[@speedkar99]

Nice. Did it consume oil?

[@RolandoMarreroPR]

Can’t wait for the Chrysler Hemi cylinder deactivation tear down!

[@src4409]

Just disabled my vcm with a resistor for the coolant sensor. Vibration on acceleration is gone. Only occasionally feel it. I was getting 21.7 mpg. We'll see how much it drops. Honda says my pilot should only get 20mpg on average but I'm averaging almost 22mpg. Acceleration is much better without vcm so I would imagine that that will drop the mpg alone. Before I felt like I had to be careful when accelerating, but now I don't. I'm do a scotty kilmer oil flush before the next oil change and a fuel tune/flush. I'll check the oil today to see if there's a difference.

[@Miata822]

What an overcomplicated system doomed to fail, iust l;ike Cadillac's old Northstar system.

[@MrChecojvt]

I used to have a Honda odyssey 2015, I bought a Toyota Sienna 2017. There is not to much difference on power or fuel consumption, but the Toyota Sienna doesn't have the VCM crap.

[@speedkar99]

It doesn't. I heard the 2017's were the first of the 8 speed autos and were a little harsh to shift. Is that true with yours? I have a 2011 Sienna.

[@dalebills9470]

This video is fresh out of the oven

[@speedkar99]

Sure is

[@miura1902]

I completely agree!

[@adanmanriquez4558]

Very informational video. Had to look at this video because Ford’s cylinder deactivation works in a very similar way in their new F150’s with the 5.0 Coyote engine. I was hesitant to enable the feature, since I had control in turning it off, depending on what driving mode I selected. Since I’m only using flex fuel and the newer engines have both direct and port injection, I’m not too worried about carbon build up. Probably just have to keep an eye out for oil consumption, and ensure I change out the oil regularly.

[@marty0715yt]

All apart!! Now time to clean out the dishes from the washer and get those parts in thar.

[@speedkar99]

Or take it to the coin wash and power wash it

[@Heindl661]

Thank you for the in-depth demonstration and visualization. Very well done!

[@miura1902]

Thank You Very Much!

[@m4gician]

I know you might have one but one of those Lisle crank bolt socket sets would help on a few of these tear downs.

[@speedkar99]

Yeah it should. Hondas are always tight

[@kclefthanded427]

I don't expect to sound like a motorcycle when going on 3-cylinders

[@Furinax25]

It's actually quite therapeutic to see the engine taken apart piece by piece at this pace!

[@kclefthanded427]

@@Furinax25 No doubt about it

[@CanadianSyrup98]

You should also do a build series on your channel. I love your tear downs, but I wanna see someone like you make something of a car

[@speedkar99]

I've made a crankshaft and engine coffee table, go back and check the videos from last year

[@CanadianSyrup98]

@@speedkar99 i meant more so a full car build where you modify a daily driver, thats cool tho!

[@chahahc]

This was one of the primary reasons I chose a sienna when I got my car.

[@speedkar99]

Good choice

[@g2skinny]

Dude stupid idea really stupid been a mechanic for 30 years I appreciate your videos I totally understand your content do me a favor dude 3.6 gm alloytech everybody knows about the timing issues thanx man