Auto engine shut off and start up

plowhand

Member
I've seen a lot of new trucks have this when you pull up to stop sign or light with foot on the brake the engine shuts off and when foot is taken off brakes it fires back up you would think you would be replacing the starter more often.
 
My thoughts too. My wife's new Encore doesn't, but the Chevy version does. Saw a newer Navigator a couple months ago, it did. Following him in the fog at night, everytime he stopped it would shut off and his lights went off. I thought that was the most dangerous thing I had seen in a while. Don't think the lights are supposed to do that, but his did.
 
About twice the battery and quite a bit heavier starter. Last 4 pick ups I have had have been like that. All you have to do is bush a button to disable that function if one does not want it to happen.
 
My wife’s truck has it the worst part I hate about it especially these days is pulling away from a drive thru. When you try to turn away from the window it takes forever to get your steering back. I have had to stop and hit the button then get away. It’s very inconvenient but at a stop light it doesn’t really bother me
 
Pretty much rubbed the paint off the disable button on by '16 F 150. You can find the "spot" where your brakes hold you stopped but the engine doesn't shut off but that is a pia.
 
I can only see such a "feature" as a battery and starter killer. Not to mention when the day comes up that the engine won't restart when you are ready to go.

Newer cars with their excessive electronic gadgets are just more trouble waiting to happen. Support for these gizmos will likely die out long before the car does. Maybe it is time for people to start complaining about the unnecessary complexity being built into cars today. All those toys cost money to produce, money to maintain, and cost an arm, a leg, and part of your liver to repair when they fail.
 
As nea as I can tell it dos not use the starter. A mechanic told me the computer knows which cylinder to fire when it is restarted and that plug is fired and the engine starts. I have no idea how it works on a diesel but a friend has a new Jeep with the diesel and it starts when the brake is released but he does not hear the starter.
 
Our new Highlander has the feature, and it uses the starter.

I assume they have beefed up the starter to overcome the wear issue.

I always disable it, especially in the summer when the AC goes off.
 
David, One time and one time only turned the switch on dad's tractor and it started! Didn't hit starter bottom.
 
You CAN override it permanently! There are aftermarket products to do it! What vehicle do you have auto start-stop on?
 

Some of the auto stop auto start systems do have the capability to stop the engine in the easiest start position.
With start happening in one half of a second.
 
Agreed, it's rare. Reminds me of the free start on a model T. There's better odds of that happening if the engine is getting tired & the cylinder has just passed TDC. Then you can get a freebie after a couple days of sitting. Always got a kick out of that "feature".

Mike
 
When I was a kid, we had an old Ford Model T farm truck.

It ran off of a magneto, but had a 6v. "Hotshot" battery tied into the ignition also When the engine was warmed up, if you went to start it, and the engine had stopped on the right cylinder, it would start up when you turned the ignition on.

I can see how a computer could sense where an engine had stopped and start it without the starter.
 
My wife's Explorer has it. She didn't know if she liked it. Dealer said try it a while if you don't like it bring it in and we will disable it. So far she left it on.
 
Oh by the way. I'm almost positive it uses the starter. It will probably never have a problem since it is a Ford.
What's better? Ford or Chevy?
 
Been around 10 years or more now, no wide spread failures.

They use upgraded low rpm high torque starters with better bearings/brushes to last much longer combined with the engine angle / injection timing on part turn over of the motor for fast quiet start.
 
Some of the systems are using two batteries,and it can cause problems when someone thinks they have unhooked the battery, and one of them(maybe under the main battery)is still connected. Just a warning to we who still work on our own stuff.
 
Our 2019 GMC Enclave has this feature, and I've driven a few other vehicles with it. It's never bothered me; the most noticeable part of it is the engine will buck a little bit when it starts. Startup is nearly instantaneous and you never hear the starter crank. It's disabled in neutral and park, so if it really bugs you you can just shift into neutral as you roll to a stop.

I don't think starter wear is much of a concern; it's clear that it isn't using a normal starter motor. As I mentioned before, there's no cranking. One instant the motor is stopped and the next it's running.
 
It is possible. old model T's would do just that... but not all the time. Just turning on the ignition and the buzz box would fire which ever cyl. and if the cyl were just right, the engine would start with out the starter. Had to be quick enough that the compression had not bled off since killing the engine, but it did it fairly often on quick stops... SO.. yes its possible. Not saying the newer vehicle are doing this though.
 
It is possible. old model T's would do just that... but not all the time. Just turning on the ignition and the buzz box would fire which ever cyl. and if the cyl were just right, the engine would start with out the starter. Had to be quick enough that the compression had not bled off since killing the engine, but it did it fairly often on quick stops... SO.. yes its possible. Not saying the newer vehicle are doing this though.
 
The feature is on our 2017 F-150 - no problems yet. The starter motor is used; you can hear it but it only cranks for a fraction of a second. There is a button on the dash to push that will disable the feature until the engine is stopped with the key. Then the feature automatically comes again with the next keyed start. There is a page in the owner's manual with a long list of conditions that will automatically defeat this feature. A lot of them have to do with cabin temperature when the AC or heater are on. The feature has its merits in traffic, especially when stuck at an intersection and having to wait through several signaling cycles.
 
Had a WD Allis that way. Starter had a hard time turning it over. So put two marks about 1/8 inch apart on the distributer. When got ready to start it turn on key and retard spark and it would fire up then go back to the other mark. Was hauling little bales to the barn that day 50 bales at a time. Found out later the spark advance was rusty.
 
A friend of mine who owns a Chrysler/Dodge/Ram dealership said there are a lot of starters and batteries replaced when they get some age on them. In our climate sitting thru light changes in cold weather and same with AC on in summer puts a lot of stress on whole electrical system. I am not a mechanic but whoever came up with this idea has failed to explain why this makes any sense. Wait until this system fails when someone is trying to turn left at a busy intersection.
 
One of the Motor Trend car repair shows highlighted an electrical component that disables that feature.
 
It gets worse. The vehicles are supposed to be equipped with aux water pump and air cond compressor that will run off battery power when engine is not running. Equipped with special batteries along with the special starters.

Supposed to reduce emissions but can also increase gasoline mileage. Then they install remote car starting systems that do what, increase emissions and reduce gasoline mileage.
 
Had a 2016 Buick with that feature. After a few months, it wouldn't work half the time. instead the engine wouldn't spool down at the stop and you had to put a lot of pressure on the brake. Buick replaced the computer module and it worked better, but we were always concerned that the car wasn't "right". the final straw came when the Mrs. was going down a snow covered hill. She braked, the engine stopped, then started again when she let up on the brake, the car surged and she couldn't keep control of the vehicle. We liked the car otherwise and traded it for a 2017 that didn't have autostop. We also have a GMC Sierra, but always switch the feature off when starting out. It may save a few drops of gas, but is very annoying.
 
Well, did the latest battery killing gizmo kill your battery prematurely? Or did it just give out on its own? What constitutes "widespread failure"? Who do these "widespread failures" get reported to?

That is strictly an anecdotal statement at best that proves nothing.

FACT: when a component is continually stressed, it WILL fail sooner than one that is NOT continually stressed. That applies to batteries and starters alike.

Technology advances. Some of it is good. Some of it is great. And some of it just should have been left alone because it is either a bad idea or just plain sucks. This one falls under the last description.
 
Making a statement like this is proof of how naive our population has become.

Let me point out a few things.

When it comes to automotive emissions, we have made incredible progress. When we began doing emission testing, we used machines that sampled exhaust gases and provided results in the form of parts per million of hydrocarbons, carbon monoxide, and carbon dioxide. These exhaust gas analyzers were very sensitive machines and were also useful in diagnosing driveability problems. Measuring automotive emissions began to require more and more sensitive machines until it became impractical to continue to try to measure automotive emissions due to their being so low that measuring equipment in every shop was simply too expensive. EPA mandated the OBD-II systems to try to overcome some of this. There was a lapse in emission testing. Now, it has been determined that if a vehicle passes its own self test, it is deemed to be operating properly and without excessive emissions.

Fast forward to today. We live in the cleanest place on earth. Compared to any other industrialized nation, our emissions are the lowest. Yet, we are continually being harassed to reduce, reduce, reduce. Meanwhile, our west coast suffers from the migration of pollution coming across the ocean from the far east, but we get the blame and are told that we must reduce our emissions to clean it up.

One thing I can say about this whole "saving the planet" mentality is that WE CANNOT DO IT ALONE!!!!!!!!!!!!!!!

Like it or not, it will take the cooperation of the entire planet including China, India, and southeast Asia. Sissy one-sided agreements like the Paris accords just won't do the job.

So, if you think that your car turning itself off at stoplights will save the planet, lotsa luck with that one.
 

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