How Does Start Stop Technology Work in Modern Cars? Everything You Need to Know
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- čas přidán 28. 05. 2024
- We take a look at what actually makes Start Stop technology work in modern cars.
Gasoline engines have come a long way since their initial design, and Start Stop technology is something that's becoming almost the norm in modern gasoline engines.
In this video we take a look at what they do, How they work, Do they harm your engine? And can you disable them permanently.
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0:00 Intro
0:46 History of Start Stop
2:27 How Does It Work?
3:37 How Does It Start Faster?
6:19 Voltage Management
8:19 Special Battery
10:42 HVAC Modifications
14:50 Transmission Changes
16:15 Brakes
17:15 Making it EVEN Better
19:45 Start Stop Computer Logic
24:18 Does This Make Cars Less Reliable?
27:17 Does it Damage Your Engine?
28:27 Can you Disable it Permenantly? - Auta a dopravní prostředky
It works by annoying the hell out of you hence why I always turn it off.
Amen
I hate it too!
😂😂😂
+1
It is a pain in the......
Yes, but then you negate the emissions control. Not helping the environment.
Let me say this.. they don't make them Like This Guy anymore. I'm sure that a Lot of people were wondering about this technology. He explained this SO thoroughly that there is no comparison to anyone else in the game. Thank you buddy you are a GEM
He lied about the mpg. I hope they don't make them like him. I'm out.
@@ragnaroksangelI Illinois
@@ragnaroksangelillinois
Clearly this guy works in pr for Toyota
@@ragnaroksangel
How so?
Best layperson explanation of the start stop system that I have seen. As a retired mechanic of 55 years, I understand the system, but would be hard pressed to explain it in basic, understandable language as you have done. Brilliant job!
Laymens*
to be honest I really dislike this system.
Why?😊
You can disable it
@@whatitisnt.. I’m sitting at one of several stop signs, pulling onto a 50 MPH (60 MPH in practice) county road that I travel daily. Just as I’m moving my foot to step on the gas pedal, the engine stops. This delay and restart lurch are no fun when cars are zooming at you. I don’t want to have to think about my stop/start settings when I’m focused on on-coming high-speed traffic.
Whatever happened to the Chevy hybrid that only worked with an alternator
No you cant
I always turn that crap feature off.
How?
@@mercerconsulting9728 Most cars have an auto start stop off button.
Like always, great job Amd. This is the first time I see a mechanic goes in depth to explain how the system works from an engineering standpoint. Please keep those videos coming 👍
Which was a fantastic job, but I do think a lot of views just fast-forwarded to the ending. So that they can sleep soundly knowing it doesn't damage the engine....
Which is not true, technically, because it does increase the wear-and tear on some components... But only for petrol engines 😀. As I always point out: if you "want" to have a Start/Stop system, it is much better to have an engine which you have to force to stop rather the one you need to force to start...
Another fine example of why this Car-Care Nut and not the Toyota/Lexus nut channel.
What a great tutorial on start stop. Thank you Amd. Comment: We bought the 2017 Toyota Camry Hybrid new and use it mainly (36,000 miles so far) for short errands around Souther California beach cities. No problems. I change the cabin, engine and drive battery blower filters. I get a local Indy shop to chase then engine oil with OEM oil and filters and a change of the OEM coolant, band rake fluid. Transmission fluid is next. Did not get any caution or warning lights about the 12v battery but after six years it was near its 20% life left mark and I replaced it with an OEM from the Toyota Dealer parts department. Did not know the Computer system should be reset to show the new battery but Amd points out in this vid that after driving the car around for a while the computer will discover the new12v OEM battery and adjust as needed. Opinion about vehicle emissions control is mixed as the science for the cost vs. effective value is not readily available. I find it suspect that Calif has literally spent billions of tax payer money on clean air without providing anything for justification other than "trust me it works" while a some other States don't spi=nd a dime on vehicle emissions. Also I find it suspect that politicians, car manufactures,, insurance companies and law enforcement have done little to nothing to keep catalytic converters from being stolen by the millions year after year. . Based on $1,200 -$2,000 replacement cost vs effective value is their roll in the emissions control scheme worth it?
Worshiping youtube content creators is getting old..
If hitting the disable button every time you drive is ok then disabling the system entirely should also be ok. Just another BS system added to cars that runs up the cost of the car and maintenance cost too. Your government at work. I feel the same about reducing engine size and adding a turbo... looks good on paper to the government, but the buyer pays the price in the end.
This man is a well educated professional. Does his homework. The kind of technician who u want on your vehicles
That system is WAY more complicated than I had thought. Thank you very much for the clear rundown of the basics.
The lack of start stop was one of the selling points for my purchase of a 2019 RAV4 (2020+ they added it) along with both direct and port injection, a traditional automatic (no CVT) and a naturally aspirated inline 4. Happy with that decision thus far.
Good to know. I may look at a 2019 Rav4.
I'm glad I have a low mileage 2019 corolla and low mileage 2020 Tacoma. No s/s.
I completely agree. Less is more.
Fuel savings is most likely negligible. Engineering Explained also mentioned that a start stop is only worth it when the car isles more than 8 or so seconds.
My family has a 2019 LE AWD with a physical key start, no button and a 2020 XLE AWD, with no start stop.
I have a 2020 Rav4 XLE that does not have the start-stop feature.
No this is more trim Specific than year specific. 2019 LE has start stop. And a 2023 Adventure/TRD never had start stop.
Never imagined that this system was so complicated. Just makes me think that this system has so many components that can fail, adding to the upkeep cost of these cars. I do have to commend you on your very in depth explanation of how this system works.
Absolutely. I'm a limo driver, and the alternators in modern Audis fail prematurely - they serve double duty - they also serve as weak electric motors, being able to a) add a bit of torque, and b) start the engine when the engine is warm. It wouldn't be such an issue except that there is a worldwide shortage of these alternators. I have great warranty - 5 years unlimited, but what's the point if they can't source parts?
These vehicles will financially kill the lower income bracket!!!
Can't afford to repair!
@@gregsullivan7408Audi isn't even a valid car 🙄
@@MadScientist267lol. Audi is considered very premium here in Australia - perhaps not QUITE as premium as the other two German badges, but definitely premium enough for a limo. I have the Q7, which is very popular here for limos, due to it's combination of luxury and practicality.
@@gregsullivan7408 It's overpriced, overengineered, and underdelivering. I've seen how easy they come apart the hard way, just for starters. Great if you like them for whatever reason, but good money is spent elsewhere.
Toss BMW in the same list, along with a few others. Just not impressed with "european engineering" in general with a few exceptions.
I am an engineer and I enjoyed this immensely
lol… engineer solves a real problem. This is a stupid solution to a fake problem.
@@ExecuteBrandonengineering is not based on feelings and subjective reasoning like what you’re trying to say
@@twinkieerella Work on your reading comprehension.
@@ExecuteBrandon k
I just purchased the RAV4 XLE premium. It has this technology and I don't mind it as much as I thought I would
I have a 2015 Jeep Cherokee and a 2022 Ford Maverick, both with the Start/Stop Tech. Being a senior instructor on jet aircraft, I really wanted to understand and know more about this system and what that infamous switch controlled. Your time and effort developing this production as well as others are greatly appreciated. Thanks!!
Gas pedal switch not that hard to figure out.
@@Plzreplyhello it's not that simple...
Love TCCN. I love how he’s now got the chapters. (Maybe automatically generated.) Makes it easier to follow.
I love his presentation and persona.. I’m a total fanboy.
I’ll let you know if I eventually buy a Toyota/Lexus. … When after one of our three, … 20 to 11 year old cars: ‘03, ’07, ’11; Element, Sentra, Camry, bites the dust. Their days are numbered. Especially with the Boston drivers and weather.
@@Plzreplyhello you sound like such a moron, lol
maverick gang 🤙
I had no idea that this routine was so complicated and that it required so many sensors to accomplish it's goal. No wonder these cars have seen such a rise in cost, plus it's added more opportunities for failure. Thanks for your good explanation.
Gov try to do good with new emission controls but all being cancel out with more parts to replace (more carbon to manufacture these replacement parts) ending up to NOTHING! More annoying than anything else - especially if you in middle of cold wheather when engine shut off and you kind of stressed out whether the damn engine will start again or NOT!!!
@@Nic1Moreno that is simply not true, a modern engine does NOT need to be warmed up. And the person you responded to commented about a running engine not restarting at a light or whatever
AcCording to master mechanic, Scotty Kilmer, start start causes more problems than it’s worth and wears your car out faster this coming from a real mechanic who deals with this system m.czcams.com/video/L7524u5w4ZE/video.html&pp=ygU1U2NvdHR5IEtpbG1lciBzdG9wIHN0YXJ0IHN5c3RlbXMgYXJlIGJhZCBmb3IgeW91ciBjYXI%3D
@@Nic1Moreno you seem triggered, and you failed to acknowledge that you misunderstood the post you replied to
@@Nic1Moreno Oh, and your wrong, 20-30 seconds, that is it , so take your lumps and move on.
My 1925 Ford Model T has its own Start/Stop technology. This only works if the engine is already warmed up. When you shut off the engine and turn the ignition back on a short time later, often the engine will start instantly. This happens without hand-cranking or using the electric starter. In the Model T world, this is called a free start!
You did an excellent job describing the technology of the start/stop function in cars. You made it very easy to understand and the ideology and the complexity of this system. I'm very impressed with you and your videos. Thank you!
In conclusion very irritating for minimal fuel savings.
If you drive frequently in city traffic there is a significant savings of heat and wear on the gas engine over the life of the car, that can be more beneficial than any fuel savings. Aside from the fact that burning fossil fuel at stop lights for no reason is a little bit crazy.
@PappaMike-vc1qv Our government is filled with self- justified positions, and one of these clowns came up with restrictions that led to this gem. My position is much simpler and more effective. Make traffic management smarter. Why do I always have to stop at a red light on an empty road at 4 am? Why do traffic lights turn red when there's no traffic going the other way?
If I can use cameras at work to detect small distinctions in parts and react to that with a plc control, why can't this be done with traffic? Because they want you placated, and they want you to pay for their environmental plans.
I have to admire the hard work of engineering and design to give us the most loathed “feature” of our newest vehicles
Great explanation and video. I just got a 2023 RAM 1500 with e-Torque 5.7 hemi. I just can not believe this stop/start not causing unnecessary wear on the cylinders. Especially in the city. Hot road, hot engine, oil drained cylinders, several times. Ive always believed the start was what wore an engine as oil wasn't on the cylinders. I enjoyed the video and subscribed. Ill plan on pushing that button for off.
I agree. Main, cam and rod bearings use hydro static lubrication. There is never any metal touching the bearing when there is oil pressure and its running. Most wear comes from slow and cold starts where there is low or no pressure. I cant wait to see what batteries and starters cost for my 2021 durango. I shut if off also because even though it is supposed to "instantly start" It almost got my family and myself killed when I was pulling into moving traffic and it took so long to start we almost got T-boned.
of cars are using turbo chargers on engines for emissions.. I’ve had turbocharged cars, and one of the biggest problems is having a hot turbo, basically burn the oil in the bearing and prevent lubrication and frying the turbo bearing.
You’ve and you have any heat in the turbo and you start shutting off the engine that’s not good.
People forget that the e-Torque system has a belt driven motor/starter that starts the system instantly, and has a small hybrid battery to run it, giving you some extra HP when accelerating.
It is basically a mild hybrid system, and it works perfectly as a start/stop system. I have driven a few Wagoneer's with the e-Torque system and it works great. Really no reason not to use it.
@@HisDudeness2023 yes. Its toast you oil nicely too. Forced induction just makes more heat and wears out head gaskets and stresses engines more. Unless its a heavy rigid block with great cooling its gonna wear out faster.
@@britjohnson1990
Bought my son a WRX and he rode the hell out of it for 250,000 miles . Royal purple and a turbo timing resulted in the original turbo charger working great until he sold it.
All that was required was frequent oil changes.
My question was auto stop .
Brilliant detailed video. In March I changed my car for the first time in over 17 years. I had a 2003 Citroen C3 1.4 diesel from Nov 2005 till I traded it in & got a new Suzuki Ignis 1.2 (soft) hybrid. I got myself in a money mess some years back & so just managed to keep the C3 going each year. Money problems sorted so was great to effectively jump 20 years forward in car technology. The Ignis has this start/stop & I love it. Plus some of the times it says 'Auto start/stop disabled' & now I know the full reasons. Thanks.
I had no idea stop/start systems were so complicated. No wonder modern cars are so expensive!
A lot of engineering and expense for a system most people find annoying and bypass every time they get in the car.
Right lol@@cgraham6
That plus feature creep, or the automotive equivalent of bloatware. My new truck is a base model by today's standards, but would have been considered a luxury truck only 20 years ago.
@@cgraham6 Exactly right. I'm in Australia and although most modern cars these days have it, it is quite rare for me to hear someones engine starting at a traffic light. This tells me that a very small percentage of people actually use it. Most people just get in the car, put on their seat-belt, start the car, turn off the start stop, then drive. They have just added that unnecessary extra step. I just wished they would've put the effort they used to design this into working out a way to reduce the idling speed of an engine without it stalling. That would presumably have a much higher environmental impact as it is something that people would actually use!
Thank government for that.
I hate start stop in my 2020 v6 highlander. I push the disable button right when I start my car, like putting on my seatbelt.
Just put the little piece of cardboard between the button and panel. It will keep the button always pressed and the Start-Stop off all the time. Done this with piece of black packaging cardboard (flat, 5 times more dense than a sheet of paper) on my Palisade 2022 and I never seen it working :)
This is extremely educational. I have been issued a company vehicle that has the start/stop technology. Admittedly I’ve been nervous that it would destroy the car so I turn it off a lot. I feel a bit more comfortable with it now. Thank you!
Gas pedal and brake pedal is my stop start tech. Thanks for the video
Back when Mazda was developing SkyActive, they used their ignition timing and DI fuel injection to momentarily spin the engine backwards a few degrees to put one piston under TDC with some amount of fuel. Then, to start the car again, that cylinder would ignite and the cycle continued normally. The starter motor was never involved. I have no idea if they ever brought it to stateside, and I’m really curious what became of it.
When I first drove a car (Ford Mondeo) with s/s technology, I wondered how it was accomplished and came up immediately with the TDC theory. Great to learn that it has been tried and tested at least practical - if not for the long-term. Don't know.
They didn't bring it to the US market (at least not untill I left the dealership last year, I think they have it now in the cx90). I think start stop is overall a good thing, but US buyers don't want it, so I would say that they made the right call.
I remember from training on the international start stop system, they could use the vvt and throttle to brake and stop a piston exactly at BDC so the engine could start as quickly as possible.
@@danielwinn7108 Hey Sir. Thanks for the info. What you say makes sense.
I don't know for the US, but i guess it's the same as Europe, it is exactly how the start/stop system works on my MX-5 ND, and it's freaking cool ! I have the 6 speed manual, so the engine is restarted when pressing the clutch pedal to engage first gear. It is so quick that the engine as already started before you finished pressing the clutch pedal. Very freaking cool tech. As a bonus, the capacitor that manages the voltage drop and the battery are recharged via kinetic energy when braking (brake pedal or engine braking)
Seems like a reasonable start/stop system would be with a spring that winds up and releases for the next time it is needed. Assuming the car starts with a couple cranks, the starter could remain virtually unused.
Well done - thanks for this explanation! Having grown up in the 50s and 60s we were always told the constant starting and stopping of the engine would kill the starter - and it was often the weak link. I always carried a hammer in my Corvette to whack someone's starter - (just as useful as a good pair of jumper cables)
Back then they were probably inertia starters. I recall my Father carrying a hammer in his Morris Marina to bash the starter when it wouldn't engage.
Still works with pre engaged starters. The usual problem is the solenoid sticking not moving the gear into the flywheel. Had a rescue patrolman use a heavy chisel!
Jesus, what an understandable, relatable explanation. Thanks.
Good to know that my car is so smart and complex in deciding whether to annoy me. 😂 on a positive note, it does have its merits - one time my start-stop wasn't working normally and I figured out shortly later that it was the AC cooling coil leaking, resulting in higher than ideal AC temps which prevented the computer from performing the start-stops
It’s amazing to me how long some emergent technologies actually are in development before they are finally implemented. In June of 1983, as a mechanic I interviewed for a position at the Bendix proving grounds in South Bend Indiana to help test this system on various cars from different manufacturers.
The system still needs to know to avoid turning off before I shift to park at the parking lot or when I stop in the garage. There is still a gap in the communication between humans and computers
@@cadacabezaesunmundo6496 on some cars you need full brake pedal engagement to trigger the auto stop. So if you tap the brake and put it in park, auto stop is disabled once you get into park.
Thanks Car Care Nut for your presentation but you also made the case against these systems. For the minor improvement in mileage and cleaner air, car makers added expensive complexity which will cost more to take care of over the life of the car or reduce its economical lifespan. Unless it's a rental car that we don't care about, it's best to disable it each time we get into the car. BTW, selective cylinder deactivation found on V8 engines also does not help prolong the useful economic lifespan for its minor fuel savings, and it is not as straightforward to disable each time we get in. Engineers need to be reminded to KISS (keep it simple stupid) and not get carried away with complicating things simply because they can. Regulators should also be reminded that their cleanliness goals won't be achieved by making machines so complex and expensive to maintain if they become junk prematurely.
I’m with you, I disable it to because it stops pumping oil.
He says it needs a special battery for this stop/start to happen. What if you put in a regular battery, wouldn't this tell the computer something is wrong and disable the start /stop function?
@@dwaynelasater2350thats a great idea
@alexandershonfield5879 yeah what’s the point in trying to get 3% better gas mileage and supposed “cleaner air” if the vehicle breaks down earlier and is less reliable. Reliability is a major factor in how green a car is. A 30 year old no-nonsense car still ticking is way greener than a new car with this system that goes to the salvage yard earlier. But most people today are too dumbfounded to realize this, because every time they hear the word “the new one gets way better gas mileage” their ears perk up like a wild coyote. They don’t think about the reliability and lifespan being decreased. Thank god you understand this
Turbos need lubrication until they stop spinning which may be long after the engine stops
Absolutely brilliant explanation of the system. Only thing I’ve always wondered is if the turbo could be damaged doing a continuous high speed and then suddenly a stop event is called for. I always let the car idle for a minute before switching off so that it spools down and with oil pressure in the bearings. So why never any turbo damage ?
Thank you, man of God! Your videos are exactly what I need. I'm not a mechanic, probably never will be, but at least I learn a lot how to take good care for my car. May the Lord bless you abundantly!
How did God enter into this?? Can't you find another place to spout this crap.
I have a 2017 Highlander and the other day, in stop and go traffic with this feature kicking on repeatedly, I got a warning that the battery voltage was too low to continue using it. Since then I was wondering how this whole system worked. SO this video was very timely and really informative. Much appreciated
czcams.com/video/d-O5j4Qax_c/video.htmlsi=nYZYTp1dbocbMnOB
I would turn it off manually in stop an go.
Your battery will be dying soon. Get it checked. This is the exact same sign I got with my Highlander.
Makes sense in a hybrid, not so much in IC (real pain at traffic lights - major hesitations).
Interesting, what type of vehicle do you currently drive? If stop start is causing a major hesitation at a traffic light then you seriously need to get it checked out by a mechanic because a slow crank could be a symptom of something like low compression or failing injectors.
I drive a diesel 4 cylinder and the even if I take my foot off the brake pedal and onto the accelerator as fast as possible, the engine is fully started before my foot touches the accelerator. That’s normal even for a diesel that takes more effort to crank, with a 9.5 year old battery. If your car takes longer than that to start up when warm, or if you have a petrol engine which can easily start twice as fast as a diesel, and you’re still expecting hesitation then either get the engine checked for a major issue, or send the car to the junk yard!
hesitation came from engine shutting down and then restarting as traffic light changed. hard for an IC engine to accelerate just after being restarted. I usually turn system off as it offers little benefit.
This guy is legend and I still cannot believe that the start/stop system doesn’t damage your engine keep up your work thank you
Legend? 😂
Thank you… learned quite a bit! Many yr ago I hosted a European exchange student and she told me many drivers shut down at lights to save on expensive gas. Of course, the starters, batteries, etc weren’t designed for the stress. I have just gotten my first vehicle with this feature. I’ve read some studies that show just over 2% fuel improvement. I sometimes shut the system off, but often leave it on especially driving local intersections where I know I’ll be sitting a while. The computer seems to do a good job of knowing when to disable it to keep the HVAC running properly.
Good explanation 👏 I don't like the fact on most stop/start systems the oil is not circulating. Also that catalytic converter is cooling down, kinda defeats the purpose...
Don't buy it
Good informative video. Glad my car doesn't have start/stop. My 30 year old Toyota pickup still has the original starter.
This is WHY we're "Car Care Nuts" family. Take care of it, & run it until the wheels fall off! 👍✊🖖🇺🇸
you are a mind-reader, you answered each and every question I had and I don't see anywhere in internet.
I only got my first start-stop technology in a car this past spring. It is a little annoying though we don't usually turn it off. Wow, I never realized how complicated the whole system is. I have worked on my cars somewhat in the past. My newest vehicle before all this was a 2012 Ford Flex that was purchased with 7000 miles on it. But I have more or less decided that I will not be working on my 2024 Ford Maverick 2.0L (non-hybrid). Brought it for the first scheduled check up this past month. I still have my 2007 Rav4 to work on.
I'm so impressed with this video. It's so clear, each step, to fully understand all aspects of this feature.
Great video, this makes me and others think of what they do not want when buying another car.
@@kennylavay8492good luck, they all seem to have this now. I test drove vehicles in 108F temps after work and didn’t notice this, now I know why. Bought one during a cool front and discovered it has it. I’d asked about the other cars, but forgot on this one. Fairly seamless at lights, but unnerving when you break to not rear end an erratic driver. I just don’t expect a new vehicle to feel like it’s stalling right then.
Save $150 in gas over 10 years: Spend $500 on starter replacement. Makes sense.
500 my sweet patootie. Plus what else needs to be removed to get to it and what does one of these new ones cost?
You also need to take into account that you pay more for the car, and more for the battery. Consumer losing all the way while they find new ways to tax us to death in the name of climate change.
Inflation is an indirect tax as well. Gotta love the gooberment and this administration, eh? @@charlconradie4935
Due to inflation $150 would be worth more not by a lot but still exists and it’s more about emissions than fuel savings.
@@Mayan-_ $150 isn't going to inflate to be the equivalent of $500 in a mere 10 years. Yes, this is all in the name of emissions - to save the planet from the fake global warming agenda. Nevermind the mining, manufacturing, and disposal of electric car batteries cause more damage to the environment.
Excellent breakdown of every engineering change needed to make start/stop systems work. So many extra moving parts... so many more things that can go wrong and cost $$$ to fix.
Wow! Great explanation about how much work went into a system that everyone hates. As an aside, with my 2019 Cherokee I can avoid the system with careful brake pressure instead of turning it off.
The one important item you missed is the turbo on the car. A turbo needs time to cool down. They are more prone to failure and the cost for them is fairly high, but the shop cost and time to replace one is the a decision to be made.
That drove me nuts with Honda's decision to put it on the 22+ Civic Si. It'll wear the turbo out faster since the oil will coke in it.
Unless there is an electric oil pump that stays running but I would be surprised if it had one.
More than likely since the turbo on these cars is coolant temp controlled they just said its good enough.
I came to the comments looking for this. Yes, hot turbo and all the sudden it looses oil pressure will greatly reduce its life.
@@kevinortizphoenix all modern turbo cars are coolant and oil cooled, so its not really an issue.
Absolutely! This guy in the video is a shill.
@@Shiver2002 and when the engine is off....yeah the cooling and oilpump is OFF.
Considering that it has been estimated that 80% of engine wear takes place in the first few seconds of startup, I think that this will damage an engine in the long run. And what about the ring gear? The wear on that and the cost to replace it has not been addressed. I understand that there are electronic plugs that can be installed on the back of the disable switches to cancel this "feature".
The key factor you are not mentioning is that 80% of engine wear takes place in the first few seconds of a COLD startup. These are not cold startups. They are at operating temperature with engine oil still at effective temperature.
This is a great breakdown and explanation of the start/stop technology and how it works. I still don't like it in my car (I have a car where there is no button to turn it off) but at least I know its not doing more harm than normal.
wrong 5 features that might fail in the futur
@@art333-dg8ddYou're a futur
Very good explanation on how the system works , thanks . The system does make the car more complex, more expensive to purchase and cost more to maintain . My mother in laws van has two batteries and high quality batteries will last three years max. Then when one gets weak they both have to be replaced . Now that many engines are turbocharged I don't like the ideal of losing the oil pressure for turbo lubrication and cooling every start / stop cycle . Like they say " the only thing constant is change " . Life is full of give and take .
And car companies are all about taking! Taking more money from us to further line their pockets with higher and higher profit margins.
That was my thought too. He mentioned an electric oil pump for the transmission but I'm not clear whether it's enough to maintain oil flow to the turbocharger.
I’d only trust start stop systems on hybrids
Thank you for your, as always, simple explanation of a complicated system. As a retired electro-mechanical engineer it is my humble opinion that this technology is a total waste of technology and engineering and accompanying expense to achieve the miniscule amount of emissions it will reduce. More complicated = more problems = more expense for the car owner initially and over the long term. When purchasing my latest vehicle a few months ago I specifically searched for a vehicle that DID NOT have this ridiculous start-stop technology and found it in a used 2019 Lexus RX350.
good decision i will do the same.
Great points. A Harvard study finds 'decreased vehicle emissions linked with significant drop in deaths attributable to air pollution.' So despite the increased cost of the technology and minor annoyance of Stop/Start, it can be argued there is a benefit to society.
I found it absent in my 2022 Nissan and couldn't have been happier for a less complicated system.
With all do respect... I personally don't believe any study that comes out of liberal-agenda-driven Harvard University.@@universalassociates6857
You should drive your car for 20+ years like I do. 2001 PT Cruiser still driving strong...modern at delivery, no longer. No matter.
Great content, MD. I came just as we were looking for ways of permanently disabling the system. Thanks a lot, we take your advice.
Just unplug the sensor on the negative of the battery. Done
@@CZcamsPentium I guess that would trigger the check engine light?
@@ronaldderooij1774 no, just shows that the auto start stop is off
Thank you for taking the time to explain this in an easy to understand way. I learn something new from all of your videos. Great job.
Mr Nut, you do such an excellent job explaining whatever subject you’re addressing. I relax while being informed!!
I will definitely avoid any vehicle with this system after this brilliant review.I had no idea it was this complicated.
you will find it i svery difficult to avoid this system ob cars, just learn to hit the bypass butting when you start
If you buy new or new used you can’t avoid it!
@@ronaldbrown5745 My 2018 Japanese manufactured Toyota Yaris doesn't have it so I'd better hang on to it then...and I still have two other 90's cars luckily.
@@ehbenson2948the lesson here is that the bypass button is the least of your concern. The reengineering and addition of all these systems is the real problem.
Only way to avoid it is to never buy a new vehicle. You are stuck with 2016ish and prior forever.
It’s crazy the amount of things they had to do to get this system operating properly. So much more complexity for such a tiny amount of gain.
This guy is great on explaining the car operations and educating us car nuts on how, and why cars operate the way they do!!! He is the first guy or channel I have ever subscribed to.
This video has been very informative. I considered battery, starter, the HVAC but never figured out how they would do it, and after buying a vehicle with the feature I realize the extent of the monitoring being done. However, I never thought about the AT transmission pressurized the system nor keeping the coolant flowing. I think this is the best that content explains the auto stop/start system. Thanks AMD. 🙏🏾
You're right. All of this is just further proof that the whole thing is just a bad idea all around. There is *no* point in all of this
I was never really a "car guy" per se, but I've always been interested in all things mechanical. Only recently, thanks to youtube, have I been privvy to the technology that goes into cars. Until a few years ago, I thought these car computers were pretty basic, especially those dating back a decade or more. It's crazy how much they control now, and it's interesting to learn how much this one simple feature extends that.
Excellent succinct presentation of how the system works. I’ve driven a BMW with the system and it is very smooth but I never realized the complexity. Thank you for this overview.
I have a Skoda Fabia DCT Automatic. Great car, but I hate the start/stop, because it takes over a second to restart and pull away. When you're waiting to pull out onto a busy main road and you see a gap, the very last thing you want is a 1-2 second delay before the car starts moving. So I normally have it turned off when driving, but turn it on when I'm queuing at lights or a junction - until I get to the front of the queue.
I had a Jeep with stop/start. Hated it. One time after playing too hard the stop/start didn’t work anymore. No check engine light or warnings. The status screen always just said “not ready”.
It was AMAZING. 9 months later after picking it up from recall work, I stop at the edge of the dealership lot and the 🤬 shut off.
I didn’t turn around, I just reversed right back to the service desk to find out what they did. Turns out there was a ripped wire going to the battery monitoring thing on the negative post. They were nice and fixed it while doing other work.
I thanked them, left. Opened the hood at home and ripped that wire off again.
Ha ha 😅lol. That is one of the best stories here!
I think it would be great if the default was ‘off’ or if it remembered your last setting, but I don’t like it when you get into your $60,000 vehicle (or more) and you have to press an additional button every time. I also don’t like the additional expense of things that certain brands have added to their cars for it. I’m sure the more heavy duty starter is more expensive, I think some brands have added a battery to help keep accessories running so a second battery adds cost but in the end the actual fuel savings is almost nothing and is many climates the air con is running or the heat is running which stops the engine from shutting off anyways so most of the time you are sitting at a light during summer and the car just barely reaches its coolest temp and bam your engine shuts off then BAM it turns right back on. It’s stupid worthless technology that is all it does is disrupt the smoothness inside of the cabin. 😅
Yeah same same. That's why I just go into "Sport/Sport+" Mode right off the bat and that will disengage the Auto Idle Start/Stop while making my driving experience more reactive where I can paddle shift down 2 gears and go. Comfort / Eco Drive Mode does not suit my driving style since the gas paddle is stiffer and not as responsive, which makes my lane changing action a bit sluggish compared to Sport Mode.
If you have 60k to buy a car then vote with your money and not buy that car
certain car manufacturers allow for the user setting to permanently be saved. So even after the engine restart, it will remember that you had opted to disabled the auto stop/start. My car for one, does remember the user's selection after the engine restart.
My thoughts exactly, "a stupid, worthless technology".
@@danny1103 What kind of car?
The best explanation of this that I've ever heard. Thank you.
I have two Honda CRZs with a start/stop system, it comes on almost instantly because it's direct drive to the crankshaft. It's a manual transmission and I've not even ever noticed it. If you touch the clutch the brake or the gas or put it in gear it instantly comes on faster than I can finish shifting. It also makes it nearly impossible to stall the car up a hill.
Personally I think the gas savings are worth it.
Im a retired diesel mechanic . The diesel engines had a prelube system. When you hit the start button an electric pumped engine oil then the engine would start. Hot or cold it did this to reduce engine wear.
I wish you continued health & the energy to continue to create this wonderful content. In shopping for my new Tacoma, I have viewed many channels over the months before I made my decision & your channel was the most technical & helpful for me. At 73, I've learned more about internal combustion automobile engines from your channel in a few months than I know from my long years. Keep up the excellent content.
Ha I was just talking to my dealer on the phone yesterday about this subject on my new car.
Google is listening, and supplying the answer to my concerns with this comprehensive video.
Excellently done, thanks.
this was so informative. I have been looking a new cars and wondered about so much of what you have explained. It is time to replace my 20 year old sienna and so much has changed in 20 years.
Some people used to wedge a piece of toothpick in the gap next to the disable button so that it's always pressed in and they don't have to manually push it every time.
The battery info is especially vital to me since I thought in 4-5 years I could replace the 12v battery myself. I have a 2022 Venza & had no idea how complex the hybrid system really is. Thank you AMD for this very important video.
You can still replace the battery yourself, you just have to buy an AGM battery. AGM means absorbed glass mat, and it means the battery acid inside is absorbed into fiberglass mats instead of sitting as a free-flowing liquid. They cost between $180 and $250.
@@jefferysurratt5650you gotta be careful though. A shock from the hybrid battery is certainly lethal
@@mitchaser5159 He's not talking about the hybrid battery.
Glad to know how this new system works. What a great simplified explanation of a complex system. I received a tip that this system wears out the starter faster so turn it off. Bad idea. Now I know why I should leave it alone and make it function as designed and intended. Thank you for your valuable explanation.
Very informative. I have start/stop on my ‘17 Audi and now I understand it better.
My old car had stop-don't-start technology. That's why I watch this channel.
😆¡Como la mayoría de los coches!
I have been pulling wrenches since 1958 and this is an excellant explanation of this system! Thanks!
Very nicely explained! I always wondered how this system in my car works, now i finally got every answer!
So at 380k start cycles the S/S disables itself. I think that's a grand idea! I disable mine everytime I drive it! 😂👍
On my Vitara mild hybrid it works flawlessly - it uses ISG instead of regular starter. It uses the belt instead of gears and there is no cranking noise (it does have regular starter, but it is only used when engine is turned off completely). Also it has the manual gearbox (as I prefer) and I have much better control about when to engage the start-stop. As long as I keep the clutch depressed, it will not stop the engine, and when I put into neutral and release the clutch, it will stop immediately. As soon as I press the clutch again, it will start the engine so smoothly that I don't even notice that something is going on, without looking at the tachometer.
This information really helped me out, as a gen z who's only form of transportation is a skateboard, when i get my first car .
I learned a great deal from this video. I had no idea how much engineering went into start stop systems. My problem with start stop is increased engine and turbocharger wear. Nowhere did I hear about the engine oil pump being redesigned to keep oil flowing to bearings of the engine and turbo when the engine shuts off at stops. If this is not occurring, this goes against the advice given by our beloved Car Care Nut about turbo care.
I strongly dislike this feature and I will never buy a car with it unless I have to
You can always disable this feature if you don't like it.
@@denisrpotvin8163 only if its not every single drive
Every new car has it standard, unless you live in a third world country.
Yep just turn it off
Cars in most countries (even in the third world) have this feature.
Wow! I thought it would just be a case of some computer checking the battery voltage before stopping the engine, and perhaps an uprated starter and battery; wasn't expecting it to be so complex. Thanks for the very clear and detailed explanation!
That was really interesting, way much more involved than I thought. Well presented. I have learned so much from you over the past year or so. Thank you so very much and may God bless you.
You gave an excellent explanation of how the the system & individual components work together with built in safeguards to make the system work! I learned quite a bit! Good job!👍
Basically more stuff to replace when the car breaks down! That things sucks!
First I have to say this was one of the best and most informative CZcams video's I have ever seen. As a retired automotive mechanice of 40 years and professionally started in the trade in the early 70's I so appreciate your knowledge. I am a General Motors trained mechanic and they gave us all this kind of knowledge back in the day for the cars we worked on.
Yes I have to say as some of your commenters say is oh why is this so complicated but you explained it and I get it. Your last line about it being a federally mandated "emission device" is what it's all about. For me I work so hard not to brake hard so I fool the system into thinking I haven't stopped. But oh how I wish there was a toggle to turn it off indefinitely. Truly the most anoying aspect of my new car. But with all that said I so appreciate you taking your time and knowledge to in great detail lay out the system and how it work. You personally are an amazing communicator and I am a subscriber and "like" the video's you do. Simply my friend from one mechanic to another Great Job and Thank You!! You'er truly amazing!!
Federal in the US , I’ll informed government regulation in the UK. I have a startup routine, start engine, hit the start/stop off button.😊😊
Great explanation. I didn't realise the system was so complex !!
Man your videos are exceptionaly informative and valuable. great job
Another aspect not covered in the video is different lubrication in the engine bearings. My understanding is there is a graphite additive to allow for crank rotation with no oil pressure without metal to metal contact. A regular engine started this many times would have significant scoring in the bearings and journals that might lead to engine failure.
No that doesn't make sense. If the crank rotates then there is oil pressure because the oil pump is moving also. They are always moving at the same time and never without the other.
@@bavarianblessedi empathize with your comment. At least for BMW they state in their technical training manual for the B46 engine that the bearings are Irox coated to prevent issues from increased wear due to natural break/interruption in the Oil Film that occurs once an engine stops moving. Therefore it is slight, but the wear seems to be increased sufficiently to require a fairly expensive coating on components that usually do not come with it.
@@bavarianblessed Agreed that the oil pump moves in conjunction with the crank. However, the pressure build-up can't possibly be instant. This isn't a closed system like a hydraulic line where a pump compresses incompressible fluid and therefore there is instant pressure on the other side. I know the system isn't fully dry as during a cold start, but the pump still has to pick up the oil and move it, and the pressure at the crank bearings has to be built up from zero after crank rotation begins, so there is at least some rotation with lower pressure and therefore potentially higher wear.
I don't believe lubrication is an issue as this is NOT a COLD start situation. The lubrication has not had time to "drain" away from the internals.
@@robertoswald3926 that was my thought exactly. Any startup will cause relatively more wear compared to just idle running but it's negligible on a operating temp engine with oil filmed surfaces. Using a quality synthetic (with low fuel saturation) may be more crucial on a stop-start engine probably?
Thank you for this excellent explanation. I had no idea that this system was so complicated! Seems like something else that could (and most likely will) go wrong :(
I like the succinct explanation and it confirmed all of my suspicions regarding the engineering of certain components.
the best explanation I could find so far! 👍👍
Thanks AMD for this deep dive in the start/stop system. Very detailed and informative as always. I learned a lot. Pls continue the good work!
Thanks for this thorough and educational presentation. I have driven a number of Lexus hybrids and they all behaved beautifully when the engine shut off at traffic lights. But not all companies are as competent as Toyota. I test drove Jaguar and Land Rover SUVs a few years ago and when the engine shut off, the AC shut off. Here in Florida, that is a serious flaw. The companies may have rectified the situation by now, but it is revealing that they failed to anticipate this problem before producing the vehicles. When the stop/start system functions like it does in Toyotas, it is seamless and effective at reducing engine emissions. I wouldn't assume that other manufacturers' systems meet that same standard.
you are a good mechanic and even better teacher! loved the video!
Thanks for this. I recently needed to buy a new battery and noticed that some of them marked 'not suitable for stop/start' and was wondering why. You explained why and much more.👍
Every video you do is great! You dig deeper than clickbait to actual interesting content. You actually sound interested in your content. You are well spoken on every topic you cover. Video and audio are always good enough. Great job all around!
Thank you so much for this! I had a decent grasp on the system but this was so very in depth and so well explained! Sir, you are a national (International? lol) treasure. Thank you for all the knowledge you share. I wish I could have you as my mechanic!
Thanks for the great video! It seems that some engineers have too much time on their hands. I wish you could be my mechanic too !!!
You talk a lot of sense and put your message across well. Thank you
Man you are really good at explaining things. Great job!
Excellent video. I never considered the change to all these systems. I thought all they did was use a bigger battery. Thanks again for a brilliant channel.