stop start technology

AKS123

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e250/2012/2200
Does anyone know all the conditions that have to be fulfilled before the ECO light goes green - new E250 CDI
 

whitenemesis

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It's all in the owner's handbook..

"The ECO start/stop function is operational and the symbol is displayed in green in the multifunction display, if:
  • the indicator lamp in the ECO button is lit green.
  • the vehicle is stationary.
  • the outside temperature is within the comfort range.
  • the engine is at normal operating temperature.
  • the set temperature for the vehicle interior has been reached.
  • the battery is sufficiently charged.
  • the system detects that the windscreen is not misted up when the air-conditioning system is switched on.
  • the bonnet is closed.
  • the driver's door is closed and the driver's seat belt is fastened.
If conditions for automatic engine switch-off have not been fulfilled, the symbol will be shown in yellow."
 

EmilysDad

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ML350
what about auto's? Obviously no clutch to dip to 'wake up' the engine? :confused:

Not that I'd ever want a stop/start car (the stop/start courtesy B Class was bad enough) ;)
 

teabag

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2001 W163 ML270 CDI
what about auto's? Obviously no clutch to dip to 'wake up' the engine? :confused:

Not that I'd ever want a stop/start car (the stop/start courtesy B Class was bad enough) ;)
It fires up as soon as you touch the throttle pedal or lift your foot off the footbrake.

Funnily enough I thought it would take some getting used to and remain switched off, but once you get the hang of it, it's quite easy.

One thing I would worry about would be the cost of replacement starter motors and ring gear if I were to keep it after the warranty period, I can imagine the life of these must be reduced drastically if the car is mainly used in heavy traffic.
 

Rotorhead500

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Used to have a C63...
As laudable as the intent of stop/start systems is, I personally dislike the system... a lot!

Now on my second car with it and the first thing I do upon starting the car is switch it off!

I queried the robustness/longevity of the starter motor when I bought a BMW with it on - "Oh no Sir, no need to worry - its been engineered and tested with this in mind!" Within 3 months from new, and a couple of momentary hiccups beforehand, the car refused to start at traffic lights one afternoon.

That was on a -57 reg, things may well have been beefed up a bit since then, but.....
 

EmilysDad

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It fires up as soon as you touch the throttle pedal or lift your foot off the footbrake.

Funnily enough I thought it would take some getting used to and remain switched off, but once you get the hang of it, it's quite easy.

One thing I would worry about would be the cost of replacement starter motors and ring gear if I were to keep it after the warranty period, I can imagine the life of these must be reduced drastically if the car is mainly used in heavy traffic.

Still not sold on the idea :neutral: I can fore see fun and games in years to come when it doesn't start when you're about to do a hill start/etc According to a neighbour (works in the garage at a main dealer) some cars use the alternator to help the engine spin over :confused::confused::confused:
 

PeterCLK

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2012 204 Elegance saloon 220 cdi
Mine works fine as WN describes.
Good point about the starter motor.
 

television

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I did not like it on the loan car I had. The starters are very different for these, there is a very good description in WIS, and I will try and find it again. :D
 

daveyjp

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The starting system for the stop start isn't the starter motor. It uses the alternator.
 

teabag

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The starting system for the stop start isn't the starter motor. It uses the alternator.
I'll have to remember this when the belt starts to slip as I'm sure it will given the extra strain of starting a diesel engine.
 

EmilysDad

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I'll have to remember this when the belt starts to slip as I'm sure it will given the extra strain of starting a diesel engine.

Just press the over ride button. How long will it take to save the £20-odd for a new 'fan belt'? :rolleyes: :rolleyes: :rolleyes:
 
C

ctech

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It's all in the owner's handbook..

"The ECO start/stop function is operational and the symbol is displayed in green in the multifunction display, if:
  • the indicator lamp in the ECO button is lit green.
  • the vehicle is stationary.
  • the outside temperature is within the comfort range.
  • the engine is at normal operating temperature.
  • the set temperature for the vehicle interior has been reached.
  • the battery is sufficiently charged.
  • the system detects that the windscreen is not misted up when the air-conditioning system is switched on.
  • the bonnet is closed.
  • the driver's door is closed and the driver's seat belt is fastened.
If conditions for automatic engine switch-off have not been fulfilled, the symbol will be shown in yellow."

i have been having issues with my stop start system on my 2010 w169( i think it should be renamed start and wont stop)as the car is running and up to temp and the system doesn't cut in at all i.e. no light on dash this happened for a whole day 5.20 am then on the return journey at 3pm it was a few degrees above in the morning so not cold i then booked car in at MB next day it was ok but then it became every few days it would play up, yesterday i got my car back from MB no faults found but what they did say is the system has to meet certain conditions but couldn't tell me exactly what ,so today i rang mercedes h/o in Milton Keynes i asked them the question about the conditions they said to look in the manual so they didn't give me any conclusive answers, the point i dont understand is " the outside temperature is within the comfort range." what is the comfort range does it have to be in double figures for the system to be operational or is plus temperatures ok ???

if i knew when the system doesn't work then i wouldn't be thinking something was wrong with it again, the other one is "the battery is sufficiently charged" i asked MB h/o how can you tell if the battery has sufficient charge they told me you have to measure the voltage when it happens again what voltage is classed as being too low ???

this has to be the worst car i have had ,only bought it end feb 2012 and i have had the following go wrong with it
1) ignition key,2) serpentine belt, 3) drivers seat belt, 4) passenger seat belt
5) water leak in boot.
 

turbopete

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The starting system for the stop start isn't the starter motor. It uses the alternator.

how can the ALTERNATOR start the car? it will need the starter to turn the engine over, surely?
 
Last edited:
C

ctech

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how can the ALTERNATOR start the car? it will need the starter to turn the engine over, surely?

on the drive belt there is a starter generator when the engine stops there is a charge of fuel in the cylinders so all you need is to spin the engine to start it again this is what the starter generator does
 

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