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post #1 of 5 (permalink) Old 05-29-2012, 03:35 PM Thread Starter
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Intelligent Stop & Go

I don't have this, and I've never tried it in another car. But it sounds to me like a waste of time....

Can anyone with personal experience extol the virtues of this newish feature?
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post #2 of 5 (permalink) Old 05-29-2012, 11:05 PM
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Originally Posted by keyhole View Post
I don't have this, and I've never tried it in another car. But it sounds to me like a waste of time....

Can anyone with personal experience extol the virtues of this newish feature?
I don't understand how it would be "waste of time"? With a modern MB when you stop at traffic lights, you anyway activate HOLD to keep the car steady without a need to press the brake pedal. Then when you start going, you press the gas pedal. You do all this same with a "Stop/Start" car without noticing any difference except that perhaps you miss some engine noise while waiting for the lights to change (traffic lights just an example).

If you browse forums like the W212 or the W204 where a lot of owners have these cars, you can find some feedback. Most often the comments are the same: the ones who do not have it, hate the idea, the ones who have it, like it (I don't have it in any of the cars in our family but I've driven these).

A car without this feature is wasting fuel. The most common doubt is concerning the starter motor life but these people do not know that the starter motor is not used at all when the engine fires up from "Stop".
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post #3 of 5 (permalink) Old 05-30-2012, 03:43 AM Thread Starter
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A car without this feature is wasting fuel.
Fractionally - yes. But an engine at idle is doing no work.

Quote:
The most common doubt is concerning the starter motor life but these people do not know that the starter motor is not used at all when the engine fires up from "Stop".
Ah - I have to admit to my ignorance here... So how does the engine start without the starter motor?
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post #4 of 5 (permalink) Old 05-30-2012, 02:50 PM Thread Starter
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When I wrote 'waste of time' I was being sloppy with my words. I should have said that I thought that it was an unneccesary addition to the car's performance.

At the time, I had not been able to find out how the feature worked. Since then I have read the 2012 CLS Owner's Manual pages 136 and 137 on this topic, and they are shown below. MB call the system ECO start/stop, which can be switched on/off by the driver.

What I found was quite astonishing. When ECO is switched on, the engine is started automatically under a number of conditions, two of which are:

unfasten seat belt
open the driver's door

Unless I have totally misunderstood the manual, this seems quite dangerous to me. Can a current ECO user put me right here?
Attached Files
File Type: pdf CLS auto engine start.pdf (151.1 KB, 52 views)
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post #5 of 5 (permalink) Old 06-03-2012, 09:00 PM
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Originally Posted by keyhole View Post
Fractionally - yes. But an engine at idle is doing no work.



Ah - I have to admit to my ignorance here... So how does the engine start without the starter motor?
An idling engine still takes fuel to run. Every little bit helps. As stated before the starter motor isn't used to start the engine. With a direct injection engine the engine injects fuel and creates spark at whatever cylinder is at top dead when the engine is shut off.
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