The TRUTH About Auto Stop-Start System (Nobody Talks About)
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- Опубликовано: 22 дек 2024
- Learn why auto start-stop systems in modern vehicles are causing serious concerns among professional mechanics and vehicle owners. In this comprehensive guide, you'll discover the hidden costs and potential damage these fuel-saving features can inflict on your engine, starter, and battery.
A start-stop system is a feature in modern cars that automatically shuts off your engine when you're fully stopped - like at a red light or in traffic - and then fires it back up when you're ready to move. Think of it like your car taking a quick power nap to save gas whenever you're not moving.
The engine turns off when you hold the brake, and springs back to life when you let off the brake or hit the gas. It's supposed to help with fuel economy and emissions, especially in city driving where you do a lot of stopping and starting. To handle all this starting and stopping, these cars need beefier starters and special batteries, which is where some of the problems start coming in.
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Disclaimer: This content is for educational purposes and should not replace professional advice. As an experienced mechanic, I aim to provide helpful insights, but I'm not liable for any damage or issues arising from the application of this information. Always consult a qualified mechanic for specific vehicle needs. Viewer discretion and responsibility are advised
Thank you. Shutting this feature off is the first thing I do in cars with it installed.
How many cars do you have?
Me too, with both our cars.
I have an “Auto Stop Eliminator” in my Subaru. It took all of 30 seconds to install and saves me the trouble of turning the Auto Stop off each time I start my car. Love it.
I've got one in my Grand Cherokee also.
Ordered it the day I bought the Jeep.
LOVE IT!
Sounds great! Where did you get it?
As soon as I start the engine, I turn the auto stop off. It's as routine as putting my seatbelt on.
Me too!
We permanently disabled it.
Unplugged one connector under the hood. Been that way for 6 years 👌🏼
Exactly, this is what I do to my Car also.
You wait until you also need to turn off lane departure, colliision avoidance and speed assist. At least auto stop works. The other systems don't.
I do too, buy sometimes I forget.
I H A T E this "feature" with an nearly unreasonable passion! Thanks for conveying WHY it's stupid. Earned a sub!
You aren't using a strong enough term to describe how I feel about it.
But there aren't stronger terms available. Yet.
The most useless system ever made.
And endorsed by the EPA. What a bunch of losers.
Useless AND damaging, m'friend!!!
And most annoying too. Every time need to turn it off
You can actually by a auto switch button that connect to the switch once you turn the car on it turns it off
@MikePoulson-qt1me Just like the DEF system in diesel trucks! More expenses than benefits.
I always thought stop-start technology was a bad idea. Thank you for confirming it.
I used the stop start system on my European car and had to replace the engine as the crankshaft piston bearing disintegrated from oil starvation. Exactly as said in the video. I learned the hard way.
Those European cars are not for city driving. My bmw seat edge trim cracked and was replaced 4 times, at least it was about $55.
In "79" we drove all around "western Europe" for the summer. (leased car, much cheaper) At the time Switzerland had a law in place that you turned off your car at stoplights for smog control. Some time later it turned out that smog was increasing due to the fact cars take an extra small amount of fuel to restart.
Also more fuel to reheat the catalytic converter.
@@davebrown9725 in 1979 nobody heard of that
Diesel engines use next to nothing ticking over, compared to petrol.
Agree fully.....this is really a feature that can potentially cause more issues than it solves....I always switch it off on my BMW the moment I start driving.....
A naff car that's gonna wear out even quicker
Douche alert🎉
@@cv6176 its a BMW. It will need a new engine before the warranty runs out anyway. Start/stop won't make a difference.
I was just thinking about this today. Literally all of it. To save gas and killing your battery, engines, starters etc. I don’t think it’s worth it in 10-15 years
After 9.5 years and 250,000 kms the engine oil still doesn't need to be topped up between services on my Mazda 3. And the car still has its original starter motor. And I have never switched off the auto start stop.
I turn it off every time I start the vehicle. It the first button I press after starting the vehicle!! It's a stupid idea!!
Here in SWNM and southern AZ my Start / Stop (which I hate) does not turn off on the hot days between May and October - you wouldn't even know the car (Buick Envista) had the function. But in the winter I am constantly turning this S/S off every time I start the motor. It is a RIDICULOUS function!
I have a 2020 Honda CR-V with that technology. When I start the car, I do two things. I fasten my seatbelt and turn off the start/stop thingy. My car is 4.5 years old with the original battery that is still in great shape after 39K miles. The battery was tested. yesterday when I had routine maintenance done at my Honda dealer.
And worst for turbocharger
absolutely. will cause that oil to coak.
the why did my Seat Leon TDI with stat/stop drive for 350.000 without porblems
@@PoulEichel luck I guess 😂
Yes, I would disable it if you're driving on a freeway or motorway. You don't want the engine to suddenly stop and the oil supply to cut off when the turbocharger is running hot.
@@PoulEichel idk what seat leon is but just deductive reasoning says if you put 350k miles/km or whichever unit of measure you use where you live, it wasn't in a lot of stop & go traffic.
Shutting the stupid thing off is the first thing I do when I start the car!
Certain Chrysler products have a sensor on the negative terminal of the battery. Don't forget to plug it back in if you are say changing the battery or something, or the start/stop will be disabled!
Good tip on how to disable the start/stop system. Thanks for sharing.
This is the first thing I shut down when I drive my AMG. Shutting down an engine with a hot turbo is a recipe for early turbo death. Hot turbos will cook the oil that is no longer pumping through the turbo when the engine shuts down. And the same happens when the oil is cold! Cold oil doesn't flow freely which means there isn't enough oil in a turbo to allow it to just shut off the oil flow completely! Even if you're just puttering around down town...turbos spin at over 25,000 RPM...more than 10 times faster than the actual engine does...and turbos can get so hot that they will sometimes glow red! If the oil isn't moving through the turbos at all times during these conditions, you will have an expensive repair in your future..and the savings you get from fuel not being burned won't make a bit of difference...
You just confirmed what I said for many years! Just another way to make more money of people. Sooner or later you will have issues! Many issues! Just, how much will a starter cost to replace? Start Stop may save you a couple of gallons of gas. A new Starter, work and for sure the Dealer wanna sell you some extras, $ 1,000? $ 1,500? Remapping, software, reset,... your newly bought battery will suddenly fail (they may tell you). Worst case, the software update may put a bug on and makes you come back to the dealer for more work!? Men, I love old cars!!!
Thank you for your honest tips. You sir, earned another sub. I am so glad both of my cars that I got in 2019 do not have start/stop. I have a Honda and a Toyota. Unless you are physically sitting in the car it is hard to find out what cars have start/stop and what cars do not. I do plan on keeping my cars so this is not a "feature" I care about.
I press the disable button every time I get in the car. It is dangerous when wanting to pull out into traffic and the cost of a battery for cars fitted with this system is outrageous.
I knew it! I had a feeling about oil pressure being a problem, especially keeping the turbo cooled. Thank you for proving i'm not crazy
I’ve gotten into the habit of turning it off every time I start my vehicle up. If I forget, the first time it auto stops reminds me.
My pet hates:
Stop start - First thing I switch off after starting the car.
Rear fog lights - Total waste of time because people just leave them on. If you can see the car in front, the car behind can see you, but cars behind won't see brake lights so well with rear fogs on.
Self parking - Parking your car is part of owning a car, learn it or hand the keys back. Up there with lane assistance, just no.
Modern indicators - Those manufacturers that place small indicators in with or near the headlight expecting other drivers to have a kind of visual superpower to see them. If you drive such a car remember we can't see them as you edge out.
Ok grumpy is going to get his coffee now. ☕️
The more automatic shite you have in your car the more problems will you have. Because everything technical will break down sooner or later, hopefully later.
Not only the environmental stuff like this. People fall for the car manufacturers' propaganda that tell you that you "need" all that electronic crap.
It's interesting that people survived by driving in and before the 1970's without having an AC, electric windows, central locks etc. Here in Europe we didn't even (I still don't) miss automatic gearboxes.
In 1987 I bought a brand new Toyota Hilux 2.4D 4WD pickup truck.. It still had nothing of that crap, not even a radio as stock. It was made to take me from place A to place B (literally), nothing else. I indeed installed a stereo by myself. That was all. I drove it more than 100,000 miles (160.000km) in 8 years and not a single technical issue. But me, the idiot, wanted a Mercedes.😢 That's the main reason why I sold it.
What i have determined about my late model Honda Suv. In summer put the AC to max cool setting and the stop start never cuts the engine off. When setting at a light, very lightly press the brake and engine keeps running. If you know you want the engine to stop, press the brake firmly. Then when you want to start the engine - lighten up on the brake pedal.
My Brother-in-Law had a BMW X5. The service guys disabled Stop/Start for him. When he replaced the X5 with a new one (about 5 years ago), the service guy told him "We have been told we are not allowed to do it anymore. If anyone else does it, your Warranty will be voided." The explanation given was that VW/Audi Group had been fined millions because their advertised fuel mileage was based on having Auto Stop/Start operational. (I may not have that 100 percent correct, but that was the guts of it.)
This information is a great public service. Thanks. Auto Stop-Start is virtually unavoidable anymore, so the least we can do is to turn it off after we start the engine. I doubt that a dealer will permanently disable the feature for us, and even an independent shop may hesitate. That also may void the warranty if it shows on a diagnostic readout (dealers love to have an excuse to avoid less-profitable warranty repairs).
There is no prblem with VCDS and OBD to disable Start/Stop for good , and it costs 5min of time. Of course you can make it as habbit and always switch off start/stop when starting engine, like pulling parking brake on/off.
What about the extra strain it puts on your timing chain each time you start, causing stretch and early failure.
Idle stop restarts are very easy starts. The engine and components all are at operating temperature.
My car has start/stop. The only problem is that it is always on until you deactivate it which I believe is counterintuitive.
It should be 'off' until YOU decide to turn it on if you want to use it.
What a distraction and a gimmicky waste of time.
I worked for BMW and not only are the AGM batteries more expensive but there is a registration process when replacing which has a labour cost associated with it. The biggest issue is the harm to the turbos. The system only works when at operating temperature but still not a good idea to reduce oil supply to a spinning turbo.
Two of my previous cars which were diesels had Stop Start. Hated it, engine cut it out anytime the car thought I was stopping which included momentarily stopping the car so I could put it into reverse and back into a parking space. It’s at the point now if I ever drive either of my parents cars (my current car doesn’t have it thankfully!) I automatically switch it off without thinking twice.
I can’t believe my Dad doesn’t turn his off. It annoys me so much whenever I’m with him in traffic. It shuts off after 5-7 seconds and turns back on 3-4+ times just to creep up a few inches. Not good for the car
Fiesta ST line here. As many others have said, it's the first thing I press once I start my engine. I wish I could set OFF to be the default.
Thanks for confirming my concerns with the oil pressure issue with so many stop/start cycles in heavy traffic…
Small car, low mileage UK viewer here. In my town, a quarter mile section of the main road through town has a lot of junctions and pedestrian crossings, so at busy times you might stop for a few moments literally 10 times. A new battery for my car costs around £110, which will buy enough petrol (gasoline) to take me over 1,000 miles - around 1/4 of my yearly milage - and that's without counting wear and tear on the engine itself.
Running my car in Sport Mode switches off Auto Stop/Start, and (counter intuitively) gives me better fuel economy, so it's now permanently in Sport Mode.
My car has it, it's been off since day one, like you say wear and tear isn't worth the savings of gas.
I leased a ford escape. Always used the feature. Thought it was great. I now have bought a maverick and after learning how this on off thing can damage not only the starter and stuff, but also the timing chain too! I turn it off whenever I start the truck. Its useless!
Can you help me I have 2024 toyota rav 4 xle premium awd have stop and shot sistem auto stop i try to disconect cable but than I have alarm showing on dashboard and than got device from Amazon to disconect but still does on his own shots engine on stop is there anything good to disconect or erase that option please help me
I would not be surprised if it also creates more emissions in the long run. When you first start a car up, are those emissions worse, better or the same as when it is just in idle?
So true. Tangental to oil pressure is all those turbo and/or supercharger bearings are not being cooled by oil when the engine is turned off by ASS, and no oil is flowing past the bearings. Good times. 👊🏻
I've recently purchased a Hyundai 2020 Santa Fe. This was my first time with this "auto-off" feature. I found it annoying when trying to start up from a red light going green, expecting "power" and finding out the engine room called to say "Give us a second...." The buttons for "auto-off" and "emergency break" are next to each other on the center console.
Standard check-list for start up is now.....
1. Engine start
2. Lights (if needed)
3. Wipers (if needed)
4. AC or Heat set as needed.
5. Seat belts secured
6. Doors secured
*7. Auto-off disabled.*
8. Emergency break released
I don't want to get complicated by modifying the engine/battery connections with odd things or digging into the electronics, so for me, I just added "disable auto-off" before releasing the emergency break (and yes, I set the break when parking it).
I just bought a 24 Tacoma and that's the one thing I don't like about the truck. I checked the manual, and even though there's a table of customizable features with a dealer only column, turning that off isn't mentioned. I asked the dealer and was told there was no way to permanently disable it. So, I'm training myself to turn it off after starting each time. When I forget, I'm reminded at the first stop afterwards, when the truck has to restart. But, I'd much prefer just turning it off altogether, if there was a way.
Stupidest feature I've ever seen in a vehicle.
Maybe I got lucky, but my car is 9 years old with 90,000 miles on the clock and it's still on the original battery with no mechanical problems so far.
My concern is this: Surely there's a big C02 penalty, firstly in manufacturing beefier batteries and starter motors, and secondly in dragging all the extra weight around in the car. Do the modest C02 savings of the stop-start system really offset this, even in city traffic?
What about the Auto Stop-Start in hybrid vehicles? Hybrids do this less often. Thoughts?
The 48 V mild hybrid usually use the drive motor sandwiched between the engine and transmission to start the engine. So more than enough power and durability.
Full hybrid vehicles do not have starter motors. When the engine starts its instant and the 12v battery has nothing to do with the engine starting because the hybrid battery and the hybrid electric motor start the engine
Part of my “pre-flight” checklist is disabling the auto-start-stop but I’ve noticed many times it turns itself back on, mysteriously, all by itself. Not every time, but frequently.
My car has a CVT. If I turn off the stop/start system, can it handle idling at traffic lights like a normal automatic?
A CVT has nothing to do with start stop technology as they do not have any correlation.
Many cars without the stop/start system have CVT drivetrains.
A CVT still has a clutch like any auto transmission, but it has no gears as such.
Well said. I'm going to shop for a circuit that latches the on/off state of the autostart system to keep me from forgetting to turn it off. I definitely don't like the idea of the oil in the turbocharger getting hot while the engine is off at a stop light.
Edit: just bought a plug n play autostop disabler for my CRV from Amazon for $24.99.
Check your warranty, if it is still valid.
I just bought a Subaru with this. The auto stop does not function unless engine and interior temperature parameters are met. The outside temperature has not been above -30c since I purchased the vehicle so it never did its thing. That until it was in a shop getting winter tires installed. Stopping at a light it kicked in and then started the engine once I touched the gas pedal. It made for a jerky forward motion. I’ll be getting into a habit of turning it off.
Excellent video. I really learned some things watching that. Thanks 👍
How do you turn it off on a Volvo XC40 B4?
Totally agreed on everything you just said.
I’m a car guy, and it hurts me every time I hear engine starts at traffic lights.
Luckily my own car doesn’t have the function. But all rental cars now a day have it and I rent a car a lot due to work. I actually drive a rental car about five times more than my own.
My next car will probably be an EV (if I can let go my current beloved gas guzzling ICE car… of which I really wanna keep her forever) so I can probably skip this annoying feature.
EVs are great for stop and go traffic anyway.
First thing I do when I get in my car: Start engine. Switch off start stop and lane departure warning. Fasten seat belt.
As someone who is working in a dealership and have been for the last six years this is 100% true these cars require a start stop battery that is at least twice the price and if you try a none start stop battery it will not last even a year I have seen many times people not believe us and use a none start stop battery and not last. The best vehicle to get is a none start stop none direct port injected motor and none hybrid all of these have a bad trade off that cost you more money than you are saving.
Trying to find a vehicle without the stop/start and no direct injection , is pretty tall order these days.
One other thing that needs to avoided are cars with VCM (variable cylinder management), where a number of cylinders are shut down at a certain continuous speed. The added vibration is hard on engine mounts. On Honda's, they have active engine mounts that adjust to minimize the vibration when the VCM kicks in, but those engine mounts go bad around 80K miles. Replacing them is a BIG sticker shock.
Just another car manufacture gimmick to help them meet their CAFE numbers.
I got a $20 simple wiring harness on Amazon that defaults the system to off every time I start the car it’s really the way to go these days
Plus similar harnesses to defeat cylinder deactivation.
What new car in EU doesnt have it? Anyone know? Petrol preferred.
Ford, 107000 miles. Original battery, starts every time with absolutely no lag at all, turbo is cooled for a few seconds by water to protect it. In my first identical Ford model I turned the stop/start off and had electrical issues. So I’m not disputing any of your video but I will leave mine on.
I always switch it of. Imagine this: You have driven the highway for an hour. Then you leave the highway and immediately you have a stop. So all your bearings are hot and with the stop there is no more oil to cool the bearings. That's why I always switch it off.
There’s a simple solution if you have a obd device . I have a obd eleven and in the settings I have changed the setting for the switch to memory not auto on like default. I’ve always been sceptical about it especially on the starter motor ware and tear . Some cars stater motors are now in stupid places like behind intake manifolds eg a 2019 Audi s4 . Which requires the engine out to access it
These systems make a little more economic sense in Europe, where gas typically costs about twice as much as in the USA. However the lag on startup is a pain, especially on vehicles that only start when the accelerator is pressed rather than when the brake is released.
I had it on my Ranger & now have it on my A5. I always turn it off. Even if I leave it on, it seems to work randomly anyway. My concern was always the battery in heavy traffic. If I think I’ll be sat for a while, I’ll turn the engine off anyway.
Soooooooo what about hybrids? Aren't hybrids technically have an auto on off for the engine? So according to this my hybrid engine is going to wear out faster than the auto start stop as the engine is constantly switching from running to not...?
Having no problem here, driving a 2013 Seat Leon 5F, with start/stop.
Since i drive a manual gearbox, when I stop at a trafic light, it just stops. When I use my clutch the car starts auto with no delay just like you drive manualy.
Only part i replaced once is the battery after 9years.
About the AC, it just shuts off the cooling (shuts off heavy consumers), but the fan keeps running.
Sometimes the car will start auto, when it drain to much from the battery.
Auto stop-start is the reason why I didn't buy a Subaru Legacy when I was shopping for a new car in 2020. In order to turn the system off, you had to go at least two deep into the touch screen menu and there was no way to permanently disable it. The boxer engine really shook the car noticeably every time it re-started at a traffic light.
I just stuck a zip tie on the corner and now i dont have to remember to push the button to turn it off 😂😂😂
As mentioned at the end, it’s car manufacturers trying to meet emissions requirements and fuel economy targets. The increasing complexity of our vehicles is the byproduct of government regulations. Cars idling at a red light can generate a significant amount of emissions. Just be thankful that you can easily turn off auto start. 3:12
I purposely bought a CX 30 that did NOT have this useless crap.
I had to replace my battery in the first years of ownership of a new jeep. The guy at auto zone told me it was likely due to the start/stop function on my jeep. It's something I turned off the moment I get into the driver's seat now.
Thank you for the heads up 👏🏼👍🏼🏴🇬🇧
I've read that there are ' no starter motor' starting systems. Don't know if they are out yet, but I still wouldn't want it. Crank position sensor determines which piston is in the correct position to get a squirt of fuel and a spark, then they continue all firing in order after that and it's started. Probably use less battery power and not a bad idea for regular starting, still would not want the auto start.
SO glad my CX-5 doesn't have this ('23) ...
I hate this feature, and I made a habit of turning it off every time I started the engine. About 6 months later I noticed that it didn't work anymore. Yea!! I don't know if this will work on every vehicle, but I think it's worth a try. I have a 2023 Ford.
Ram pickups with the eTorque system use the eTorque motor for the Auto Start rather than the engine starter. This saves wear in the engine starter, and also makes for smoother Auto Start. But the Auto Stop function can be completely disabled by simply disconnecting one easily accessible wire. This eliminates the need to manually tun off the Auto Start/Stop switch every time the vehicle is driven.
Yes, the 48V mild hybrid systems are designed for this. Not surprised Ram made their stop/start so easily defeatable.
I hate it when needing a swift take off with the car selecting the gear and engine starting up at the same time which does seem rather clunky and potentially expensive. Auto start was OK with manual boxes but hate it with DSG automatic boxes. Anything to do with eco is bad news such as the ethanol petrol muck we now have to buy in the UK. I buy the E5 stuff with 5% as opposed to 10% but we have to pay extra for the privilege.
I had a 2017 BMW 330e Plug-in Hybrid... it did not have a button to turn Stop/Start off at all. It is not as annoying in a hybrid, as the car moves off from stopped instantly on electric, and, if it is needed, the petrol engine starts after you have begun moving. Although a Hybrid might not stop/start as often in traffic as an ICE with Auto Stop/Start, the wear and tear is still worth thinking about. A Plug-in Hybrid with plenty of charge in the battery will whirr along nicely! Floor it at the lights, or to overtake, and the engine goes from stone-cold with zero oil pressure, to max power and max revs in a split-second... then ten seconds later, when you have finished your Tomfoolery, it shuts down again, and IT DID NOT EVEN REACH SKIN TEMPERATURE! 🥴
(I loved the car tho'!) BTW, I am another one who is a convert to EV's, and I cannot see myself ever going back.
It should certainly be off by default. I believe this can be done if you have the right scan tool.
One of if not dumbest ideas ever for a vehicle. At least supply a switch to disable it if we dont like it.
The only thing that’s worse for your engine, is Cylinder Deactivation
depends on the application. GM trucks? Absolutely. Widespread failure. But other manufacturers engine engines have no problem with the cylinder deactivation.
Yes, Honda engines are being damaged by their cylinder deactivation system.
GM start stop works well. It will not turn off in cold or hot weather unless the cabin is at or near set temp.
The GMs I have driven with this feature just put the car in sport mode, bang start stop goes to sleep.
The turbo issue, not many folks are using the turbo in urban start stop traffic.
On my wife macan, its always on off.
I also hate the ACC, i think its called
Adaptive cruise control.
So annoying.
I'm not a Macan driver, but I don't think it's Adaptive Cruise Control you are referring to; it is more likely to be Automatic Braking (or some similar name) which is becoming common on European vehicles. Adaptive Cruise Control should not do anything at all, unless you have activated it while you are driving.
I save over £160 year on road tax because of the stop/start system on my car. Battery lasted 11 years, no engine issues for me as car is maintained regularly, and I use the stop/start as required.
You know your battery is starting to degrade when the stop/start does not work when activated.
Maybe I have been lucky with my car, but then it isn't an automatic, as I would defo switch it off on that type of gearbox.
Two things or times I hate having s/s on my car. When sat on a hill in traffic, my car will roll back before the engine starts and then engages drive. And also the power steering turns off with the engine, often making turns off a road across traffic very awkward/dangerous. My solution to both of these is to give the steering wheel a little pull just before both, so the engine starts a few moments before its needed, giving me the drive i need to pull away safely, and power steering to complete my turn safely. My car won't allow me to turn the s/s off unless i do it at each time i start my car.
Yes, when I forget to turn off the stop/start, I usually notice how stiff the steering is, and was surprised the first time I wiggled the dead wheel and the car started. Good to have other ways to restart.
A guy I worked with had his get stuck on. It just cranked over the engine until it destroyed the starter,flex plate and battery. Also cost him thousands to get repaired.
As you say the delay when you try to pull away can be dangerous.
Auto Start-Stop (ASS) can actually put you danger. In the old days if your starter failed you were usually parked in a safe spot like your garage, driveway or a parking lot somewhere. You could easily call for a tow to a repair shop and have the starter replaced. With ASS you can now have the starter fail in the worst possible scenarios like towing a trailer up a long mountain grade in heavy traffic or driving home from work in stop and go traffic. Even better if the weather is bad.
Smart stop/start…made for several different cars. First purchase I made for my new Jeep. It just remembers the stop/start button position after shutdown.
It’s works really well in grid heavy infrastructure like California and gives me significantly more MPG. Does not add more than 1 MPG for drives with minimal interactions.
For my Acura it starts very fast and with the brake hold option; it’s actually faster than moving my foot from the brake to accelerator with the engine still running.
The system also doesn’t work until the engine and coolant is warm enough. Many Honda engines won’t be starved of oil if stopped for less than a few minutes after warmed.
It’s one of those features I mostly see as a cheat since emissions testing in city driving is done with no AC, something many start/stop systems require minimal temperature differences. In my vehicle with AC on the idle stop is very short. A true hybrid or super capacitor system would be the only practical idle stop system.
Oil pressure is a fair point
Just use a Hybrid Car, they Generally stop the usage of the Engine when you are Stopped in Traffic (Usually, not all the time, and they usually switch to EV mode)
Customer came in the other day, at 52k miles wiped the engine on his chevy, 9k dollar repair. More common in the shop is expensive batteries especially cause there's a special auxiliary for these and more starter replacements.
Thankfully, my Dacia Duster allows me to keep this switched off. In the system’s defence, it doesn’t operate when the engine is cold or the A/C is running hard.
My auto system quit working 2 years ago and I now get better mileage
Especcially for these reasons, I deactivate this sytem at EVERY ride!
(Sadly at my '18 Hyundai I can't deactivate it permanently.)
In my experience
I feel like its a good idea to have it i get like 12 miles a gallon in the city in my 2010 altima non hybrid in heavy nyc traffic i on the highway 22-23mpg best ive ever gotten was 32mpg no traffic at 45mph tried to turn the car off at long lights got 16mpg by doing that then got into hypermiling an was able to get 60mpg in the city no traffic with engine off coasting and slightly over inflated tires so it would just keep rolling believe it or not i would go about 40mph then just pop it in neutral turn the car off and make it like 10-15 blocks before i was going 20mphish but by that time id be coming up on a red light sit there for like another minute then turn the car back on when the light turns green repeat process i wish it was a key start because it was annoying to cut full power then have to go and hold the button to the accessory position so my steering wheel wont lock and you got one chance to use the brakes where power is still left you do lose power steering but i drove a different car with no powersteering for years so im used to that anyway also did with a nissan titan usually get 6mpg i got like 26 with eoc i did this durring covid but once traffic picked back up it no longer seemed viable plus the permanent code that popped up on the dash of the altima i stopped doing it with the titan when i found out about the altima code plus it was an 08 so it didnt have permanent codes yet lucked out with that one transaxle was getting hot i only did short trips 5 miles each way to and from work i started driving regular and the code cleared itself after like 300 miles and doing the specific drive cycles instructed for the code from nissan or pay 400 to have them erase it i did it the cheap way payed like 40-50 bucks in gas and drove i thought about the solution to save the the gasoline internal combustion engine car for future generations with emmisions standards getting harder and harder for manufactures to comply with if they can work in a mechanical cooling system to the transaxle so it dont overheat or for transmission for longitudily mounted engines trransfercase along with a cooler for 4 /awd when the engine is off and coasting along with an alternator and or regenerative brakeing system in at each wheel weather its from the wheels spinning or regenaritive braking charging the batterys along with electric assisted powersteering/power brake you would have two regular size car batteries instead of one so you have a larger reserve capacity you would increase mpg tremendously you would just take hit on your mpg when you want to use the heat or ac or defroster i feel its cheaper to burn a few dollers in fuel that you can fill up in less than 15 minutes than it is to pay thousands for an ev battery that takes atleast an hour to charge and adds alot of weight to the vehicle and your effed when you get a power outage i dont use my climate control often except for the summer because i usually roll my windows down a few inches and that keeps me cool in the spring .i run the ac full blast in the summer the winter i put the heat on for like 5 mins then it gets like an oven the cars warm enough to drive for an hour with the windows up there would be a system override aswell to just be able to run the ice constantly but when its not overridden make the car turn off if you let off the gas for more than say 7-10 seconds and make that option adjustable to your liking seconds after and just coast use the wheels and or brakes to keep the batteries topped off so all the assisting features work when you hit the gas the stop start would work weather your going at speed or a complete stop just like a hybrid but with no acceleration other than that coming from the internal combustion engine you would have is simular results to a hybrid fuel econemy wise in the city along with low production costs once mass produced and youd save a hell of a lot of money on not buying lithium ion batterys for thousands of dollars but still spend 5-600 on absorbed glass mat batterys when your both your batterys go out every 3-5 years you could get lucky because my grandmas agm in her hyundai was 9 years old when i changed it she barely drove it but it started right up until one day it didnt ive gotten 7 years out of my last lead acid battery and it was dead for a year sometime in the middle of that when i didnt drive it then i was able to get it to charge and it kept on kicking for atleast 3 if not 4 more years
I studied automotive engineering in college and basically yes the oil pressure needs to build back up again but in most modern cars start up does not f up the top half of the engine they use oils that are the right viscosity for most weather conditions there should be enough lubricant to get you through a startup from trying to start it bescause the engine did atleast 3 to 10 revolutions 200rpm 3.3persecond coating parts with oil before it even started in that process pumping oil and coating parts in the engine you will get extra wear in your cylinders overtime but think about all those rotations not happening cause the engine could be off for possibly minutes at a time so it kind of evens out more ware from start up less ware from not running espically if your going down a hill or mountain you could probually get down that sucker for free lol but anyways your crankshaft takes the biggest hit on startup which leads to cracks if done repeatedly and frequently which my solution to that is put in a stronger heavy duty crank in when considering this type of build and sleeve every engine even if it has dry jackets makes the rebuilds go so much easier i dont have the time or patience to try to build anything like that but would like to see it done as a way to save the gasoline internal combustion engine besides the hydrogen ice concept because hydrogen is alot more explosive when you get into an accident with one of those hydrogen cars they will probably explode like an old ford pinto from the fuel tank and a spark and it takes 3 times more hydrogen to get the same mileage as gasoline volume wise its like driving with a bomb i know the comment is very long but if your bored give it a read you might be able to improve my idea and become rich and i get to see it done its a win win if you read this far your a champion
When I was a Chassis Dynamometer Technician, my engineer and spent over a year testing vehicles with this worthless system. Even with me driving these vehicles as perfectly as possible on the rolls and him constantly turning the calibrations, we only saw a 1.4 mpg improvement when comparing them to vehicles with out the auto start/ stop garbage. Also, that’s in a temperature and humidity controlled environment with certification fuel.
Auto/ start stop does nothing more than hurt reliability and up the cost of a person’s vehicle 👎!
In my early days I was doing engine rebuilds. My SUV has the auto-start/stop feature. The dealer service told me they cannot reverse this feature. I have to remember to turn it off each time I start the engine. When the engine is stopped there zero oil pressure. When the engine restarts there is no oil pressure at the time of re-starting. This puts increased bearing and piston ring wear in the engine. There is increased wear on the starter and increased load stress on the battery. On my vehicle I cannot disable this feature. There is a prompt in the menu system to disable it, but this does not work.
I was told for vehicles sold at my location in Canada it is illegal to disable this feature by default. I have to remember to turn it off every time I start the engine. There is an add-on gadget I can buy to connect between the auto start/stop switch and the harness feeding it. This gadget is illegal for me to install, and it may void some warranty with the electrical system.
When I was speaking with a diagnostics tech at the dealer he told me with the people who are allowing this feature to work, with average driving after about the third or fourth year they are changing more starters, and batteries. They are also finding more engine wear. The replacement of the battery and starter will cost a huge amount more than the gasoline you may save.
There has to be consideration that when the engine restarts there is an inrush of fuel to get it going again. This inrush makes up for about the same amount you may have saved at a 2 to 3 minute wait at a red light. In simple words there was no saving of fuel at all. Only increased expense over the long term.
The profile for me in my car keeps it off as soon as I choose my profile.
My wife's car has it and I always turn it off when I drive. When she asked why I told her that one day it won't start back up, and I don't want to be the one in a busy intersection with the broken down car.
have replaced so many batteries on Chrysler products with this system. I can send my kids to Harvard now.
Very true, had to replace the 2 batteries in my Pacifica last year. Both are expensive. The small start -stop battery died, which in turn killed the larger main battery. Too expensive replacing batteries.
Some commenters have mentioned disconnecting one of the black wires at the battery to permanently disable stop/start on their Chrys/Dodg/Ram vehicles.
2017 F-150. Never had start/stop defeated and I have almost 400 hours of idle time. 90,000 miles and 1 battery change.
The good news is that once the battery is a few years old, the stop/start system usually stops working altogether and leaves the engine idling when the car stops. This is because the voltage has dropped slightly and the stop/start system thinks that the battery still needs charging, therefore it is not appropriate to switch the engine off.