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Old 01-07-18, 11:32 AM   #1
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Default Auto stop start activation

I have a 2017 1.2 308 with the auto start stop, however it seems a bit pointless. I understand that it does not work with aircon on, however I was trying it out the other day and the only time it would kick in is if I had the blowers off also. So no airflow through the fan system at all! Which to be honest seems totally ridiculous. Is this correct or do I need to return it again to the dealer?
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Old 01-07-18, 12:51 PM   #2
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Ours will go into S&S when the fan is running so if yours never does then there's something wrong.

If you have the fan off (a bit uncomfortable I know) does it S&S quite often?

EDIT - Our 308 is diesel and yours petrol so just possibly that makes a difference but I wouldn't have thought so.
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Last edited by Paul-R; 01-07-18 at 01:16 PM.
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Old 01-07-18, 04:13 PM   #3
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It depends on how much jus in your battery. my one also 1.2 petrol and it works exactly as same as yours. However, sometimes S&S works even air con is working but can't last long. And S&S is not working when weather is too cold or too hot.
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Old 01-07-18, 06:29 PM   #4
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It happened as soon as I turned the fans off and every time I put in neutral and lifted the clutch.
The battery level was low and then the dealer charged the battery up but it seems odd that I can’t use it if the fans are on
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Old 02-07-18, 07:44 AM   #5
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There are the whole bunch of conditions ECU pay atention on.
- battery voltage
- capacitors capacity
- alternator temperature
- outside temperature
- inside temperature
- desired temperature
- ....

if I remember well, more then 70 ....
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Old 02-07-18, 07:47 AM   #6
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I get that but at the mo it just seems completely pointless
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Old 02-07-18, 08:55 AM   #7
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Quote:
Originally Posted by Sinisha View Post
There are the whole bunch of conditions ECU pay atention on.
...
if I remember well, more then 70.
This is a list put together by Marc at French Car Forum (tip of the hat to him)

These are some of the parameters that will prevent the stopping of the engine, split into user and system conditions:

User conditions prohibiting stopping of the engine:
•Driver’s seat belt not fastened
•Driver’s door open
•Stop and start function deactivated
•Changing out of reverse gear with a timeout of 10 seconds when exiting reverse mode on vehicle fitted with piloted manual gearbox
•Accelerator pedal pressed
•Deicing/demisting of the windscreen
•Cabin temperature not corresponding to the request from the driver (variation in cabin temperature ± 3°C relative to the request from the driver)

System conditions preventing stopping of the engine:
•Not having exceeded 10 km/h after the initial starting with the ignition switch
•Not having exceeded a timeout of 4 seconds between 2 stops
•Not having exceeded a timeout of 2 seconds since the previous restart
•When the authorisation to stop the engine occurs more than 4 seconds after the initial request by the driver
•Inadequate vacuum reserve
•Engine requirement (*)
•Fuel temperature above 60°C
•Thermal protection of the alternator
•Battery temperature above 60°C or below -5°C
•Power accumulator temperature above 55°C
•Central voltage retaining device ECU temperature above 90°C
•Battery charge status below 75%
•Reconnection of the battery
•Limit of 6 stops per minute
•Recalculation of the injectors drift
•Particulate filter regeneration
•Power accumulator voltage insufficient
•Internal resistance of the battery above 5,6 mΩ
•Regulation by the dynamic stability control system
•Not having exceeded 10 km/h after application of the electric parking brake
•Power steering system downgrade mode
•Altitude above 1700 metres for vehicles fitted with the DV6C engine and a piloted manual gearbox
•Wear of the components of the Stop and Start system
•Stop and Start system in downgrade mode

(*) The engine requirements are the following:
•Respect of the depollution norms
•Optimal engine operating temperature
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Old 02-07-18, 11:23 PM   #8
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Stop Start is a system which I wouldn't use on any car. Frankly, the pitiful amounts of fuel it saves, it takes it out on your engine longevity. Most wear occurs on starting an engine up as there is no oil pressure.

Frankly the system should be setup so YOU can "pause" the engine, because shutting down the engine for 20 seconds is pointless.

As said previously, there are numerous reasons why your car won't enter into S&S. I had a brand new 1.2 C3 as a rental, it never went into S&S once, whereas my brother's car did it all the time... even when it really shouldn't have!
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Old 03-07-18, 07:15 AM   #9
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Yeah, you are probably right.
And the Earth is flat.
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Old 03-07-18, 10:02 AM   #10
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Quote:
Originally Posted by BiGK View Post
Most wear occurs on starting an engine up as there is no oil pressure.
Read into modern stop start systems and you'll see they aren't as wear intensive as you'd think

Keep it properly serviced and don't cheap out or use the wrong grade oils and the difference is minimal!

But to add to the thread, mine will go into S&S with fans running as well

Last edited by Stubbo; 03-07-18 at 10:09 AM.
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