stop and start
- Thread starter alan a
- Start date
mbmb123
Active Member
- Joined
- Nov 27, 2012
- Messages
- 107
- Car
- S350 2012 W221
Got my w221 s350 in the summer. The eco wold go green when hot, and turn off engine at lights.
It hardly ever does that now. Had the thermostat changed as was running cool (75c) since then
eco has gone green maybe once. Of course it is colder outside. Is that a factor?
It hardly ever does that now. Had the thermostat changed as was running cool (75c) since then
eco has gone green maybe once. Of course it is colder outside. Is that a factor?
Gazwould
MB Enthusiast
Excellent news , your Merc has decided it's a bad thing .
- Joined
- Jun 24, 2008
- Messages
- 50,731
- Location
- London
- Car
- 2022 Hyundai IONIQ 5 RWD / 2016 Suzuki Vitara AWD
Yes, it does not work at low temperatures. But it may also be a battery issue (main or auxiliary).
Gallon
Active Member
First step is to give the battery a really good charge.(at least a couple of days if poss). Your car has smart charging, which under normal conditions means the battery is only charged to 80% of capacity. So if you don't do many miles or the battery is getting a bit tired then the ECO stop/start light will not turn green. Usually if you have a hard fault with the ECO stop/start then you will get red warning messages on the dash of some description.
It's mostly battery-charge that governs it which in turn relies on the state of your battery, even though there are some other factors (e.g. is the cabin temp within a percentage difference of what has been asked for etc.) but if you do a reasonable drive to work and don't have too much consuming, it should work.
In colder months, the electrical system takes more of a hammering (full lights, wipers, heated seats, high speed fan plus your usual consuming such as sound system), it will take the car longer to be in a position to enabled it.
I found my 6 year old main battery, whereby the aux had already died in the same car so the life the car has had must have meant the main battery was not the greatest, was in such a condition that stop/start struggled in colder times. After a replacement, it is enabled a lot more of the time but still less of the time than in Summer.
In colder months, the electrical system takes more of a hammering (full lights, wipers, heated seats, high speed fan plus your usual consuming such as sound system), it will take the car longer to be in a position to enabled it.
I found my 6 year old main battery, whereby the aux had already died in the same car so the life the car has had must have meant the main battery was not the greatest, was in such a condition that stop/start struggled in colder times. After a replacement, it is enabled a lot more of the time but still less of the time than in Summer.
wongl
MB Enthusiast
The most common conditions must be the water temp must reached a certain level (on mine it is 40 degrees C) plus the cabin temp must have reached the set temp once before ECO start/stop will be enabled.
On my car I can nearly always trigger the ECO start/stop each morning as follows:
1) run the car until the water temp gauge reaches the 40 degrees mark
Then
2a) in summer turn off A/C momentarily to trigger the ‘reach cabin temp’ condition
2b) in winter turn the cabin temp settings to the lowest setting momentarily to trigger the ‘reach cabin temp’ condition
Using steps 1 & 2 I can get my car to activate ECO start/stop within a few hundred metres every morning.
However, I do put my main and aux batteries on charge at work at least once a month using a CTEK CT5 Start Stop charger. Each battery gets an all day top up charge monthly to keep in tip top condition.
On my car I can nearly always trigger the ECO start/stop each morning as follows:
1) run the car until the water temp gauge reaches the 40 degrees mark
Then
2a) in summer turn off A/C momentarily to trigger the ‘reach cabin temp’ condition
2b) in winter turn the cabin temp settings to the lowest setting momentarily to trigger the ‘reach cabin temp’ condition
Using steps 1 & 2 I can get my car to activate ECO start/stop within a few hundred metres every morning.
However, I do put my main and aux batteries on charge at work at least once a month using a CTEK CT5 Start Stop charger. Each battery gets an all day top up charge monthly to keep in tip top condition.
