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Automatic Stop and Start #5426946 05/12/20 02:18 AM
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rrretiree7 Offline OP
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I just bought a 2016 Jeep Cherokee that turns off the engine when you stop and then restarts when you start out again. I spoke
to my mechanic and he says I will burn out my starter prematurely. Anyone know anything about it, and will it improve my MPG? Thanks guys

Re: Automatic Stop and Start [Re: rrretiree7] #5426947 05/12/20 02:22 AM
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rubberchicken Offline
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Yes it will improve your gas mileage around town. The more stoplights, the more the savings. Exactly how much is debatable . In my experience with Fords the starter seems a bit beefer on engines with stop start. Also the stop-start only works when the engine is warmed up, so the starting load is less than a cold engine. I would expect that there is a manual disable button that allows you to turn off that feature if it bothers you.

Re: Automatic Stop and Start [Re: rrretiree7] #5426952 05/12/20 02:46 AM
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Char Baby Offline
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The way that I understand it is, the starters & oiling systems are designed for this duty. Just as engines & fuel systems today, are designed to be able to withstand the lugging that the transmissions create in the name of fuel economy...IDK if I said all of that correctly but, I know what I am trying to say. It's all good!


Retired 6 yrs now & lovin' it
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Automatic Stop and Start [Re: Char Baby] #5426961 05/12/20 03:19 AM
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Skippy722 Offline
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Originally Posted by Char Baby
The way that I understand it is, the starters & oiling systems are designed for this duty. Just as engines & fuel systems today, are designed to be able to withstand the lugging that the transmissions create in the name of fuel economy...IDK if I said all of that correctly but, I know what I am trying to say. It's all good!


This is the way I understood it as well, it’s beefed up to handle the additional load, and it uses a different battery than the normal 12v that powers the rest of the vehicle.


2019 Ram 1500 Classic
2018 Dodge Grand Caravan GT

Slight Mopar obsession
Re: Automatic Stop and Start [Re: rrretiree7] #5426965 05/12/20 04:12 AM
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demarpaint Offline
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I see you live in NYC. Once things go back to normal and we have normal traffic imo that system may drive you nuts. I won't get into any more of my feelings about the system, other than common sense indicates your mechanic is correct. Just think about it, even if the system is built to handle it, the less a car starts and restarts the less wear on the starter, and other related components. The good news is you can disable it, which is what I would do, every time I drove the vehicle. hide


God Bless Our Troops

Re: Automatic Stop and Start [Re: demarpaint] #5426977 05/12/20 04:52 AM
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Char Baby Offline
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Originally Posted by demarpaint
I see you live in NYC. Once things go back to normal and we have normal traffic imo that system may drive you nuts. I won't get into any more of my feelings about the system, other than common sense indicates your mechanic is correct. Just think about it, even if the system is built to handle it, the less a car starts and restarts the less wear on the starter, and other related components. The good news is you can disable it, which is what I would do, every time I drove the vehicle. hide


I agree with that too. Even though the systems are designed/built to go the distance, they'll still wear out sooner by using them more, than using them less.

Not all Start/Stop systems can be turned off. The Jeep system may have an OFF switch, IDK but, e.g., the Chevy Equinox does not while other GM vehicles do. And this upsets some people.

Last edited by Char Baby; 05/12/20 04:56 AM.

Retired 6 yrs now & lovin' it
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Automatic Stop and Start [Re: Char Baby] #5426979 05/12/20 04:55 AM
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demarpaint Offline
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Originally Posted by Char Baby
Originally Posted by demarpaint
I see you live in NYC. Once things go back to normal and we have normal traffic imo that system may drive you nuts. I won't get into any more of my feelings about the system, other than common sense indicates your mechanic is correct. Just think about it, even if the system is built to handle it, the less a car starts and restarts the less wear on the starter, and other related components. The good news is you can disable it, which is what I would do, every time I drove the vehicle. hide


I agree with that too. Even though the systems are designed/built to go the distance, they'll still wear out sooner by using them more than using them less. Not all Start/Stop systems can be turned off. The Jeep system may have an off switch but, e.g., the Chevy Equinox does not. And this upsets some people.

Good point about the Chevy. Then I'd look in the aftermarket for a dongle that can be plugged into the OBD2 port to disable it. If that doesn't exist I'd pass on the car, but that's just me. wink


God Bless Our Troops

Re: Automatic Stop and Start [Re: rrretiree7] #5426997 05/12/20 06:17 AM
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madRiver Offline
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Originally Posted by rrretiree7
I just bought a 2016 Jeep Cherokee that turns off the engine when you stop and then restarts when you start out again. I spoke
to my mechanic and he says I will burn out my starter prematurely. Anyone know anything about it, and will it improve my MPG? Thanks guys


He is correct it would burn out a normal starter. However vehicles with auto-start stop having starting systems not starters. They are designed for the task of increased cycles. Also remember it is much easier to start stop a hot engine then a cold start.

Our 2018 Tiguan has the system I notice a few MPG difference when temps are such that system does not engage due to extreme cold or high temps. When it is temperate like around 50-60F it seems to save fuel as engine spends its time off sitting in deep traffic.

Re: Automatic Stop and Start [Re: rrretiree7] #5427002 05/12/20 06:23 AM
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Zaedock Offline
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I don't mind the S/S system in my '19 Escape around town, but if I'm sitting on the Pike trying to get out of Boston, I turn it off because it drives me nuts.


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Re: Automatic Stop and Start [Re: rrretiree7] #5427009 05/12/20 06:30 AM
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thooks Offline
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We bought a new Highlander last September. It's a habit that we've gotten into to turn it off after every start. We don't even think about it anymore.

How about instead of having manufacturers develop new batteries, starters, systems and nonsense, the governments are required to come up with better traffic management plans?

Re: Automatic Stop and Start [Re: rrretiree7] #5427013 05/12/20 06:36 AM
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BMWTurboDzl Offline
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These systems are fairly advanced. The SS will typically not activate when the engine is cold, or outside temps are really high, etc. The starter is designed to fail at similar intervals as a traditional starter. So the "addtional wear" is moot because it does not matter if a starter fails at 190k miles vs 200k miles. Big deal.


Last edited by BMWTurboDzl; 05/12/20 06:37 AM.

“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

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Re: Automatic Stop and Start [Re: rrretiree7] #5427019 05/12/20 06:43 AM
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thastinger Offline
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Does the auto S/S disable itself if the AC is on?

Re: Automatic Stop and Start [Re: thooks] #5427032 05/12/20 07:00 AM
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ernied Offline
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I bought a 2020 Hyundai santafe that came with stop start. I hate it drives me crazy. I turn it off as soon as I start the engine.


2015 Hyundai sonata
2020 Hyundai santafe
Re: Automatic Stop and Start [Re: rrretiree7] #5427040 05/12/20 07:08 AM
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Kestas Offline
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Traffic moves well around here. The waits at traffic lights are short. I disabled the start/stop mechanism on our BMW. Thankfully it is once and done and not reset every trip.

Start/stop is only useful when stops are longer than 7 seconds.

Re: Automatic Stop and Start [Re: rrretiree7] #5427043 05/12/20 07:09 AM
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XCIDMigs Offline
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https://www.youtube.com/watch?v=tBJ_J-o-drc

These systems suck in my opinion and if you want you can turn off forever.... Also most do not use anything more heavy duty on the componentsu. Whatever nonsense sales people tell you about that might need some research. I Bought a 2019 colorado after finding that 2020 was bringing a SS system which you cannot dissable easily and checked with the part department, the starter motor and battery was the same part # as the ones used in 2019. GL with yours

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