AutoStop/Start Not Working

cre8toruk · Post by **cre8toruk** » Tue Jan 08, 2019 3:22 pm

Hi, noticed over the last couple of days (well since I drove it from the garage tbh), that there's an AutoStop/Start indicator with a line through it. Is that a setting that needs to be turned on, is it normal or should i get it looked at?

tbh not really fussed about stop/start unless it saves me a shed load of fuel!

Smartbear · Post by **Smartbear** » Tue Jan 08, 2019 3:27 pm

cre8toruk wrote: ↑Tue Jan 08, 2019 3:22 pm Hi, noticed over the last couple of days (well since I drove it from the garage tbh), that there's an AutoStop/Start indicator with a line through it. Is that a setting that needs to be turned on, is it normal or should i get it looked at?

tbh not really fussed about stop/start unless it saves me a shed load of fuel!

Hi, stop/start will only work when the cars fully up to temp & carrying a fully charged battery-if these criteria aren’t met it’s not operational

Rob

Pbondar · Post by **Pbondar** » Tue Jan 08, 2019 6:45 pm

On some cars (Volvo XC70) it also needs outside air temp to be above a certain figure even with a fully charged battery and oil up to temp..

Mr Tidy · Post by **Mr Tidy** » Tue Jan 08, 2019 8:48 pm

Be grateful it's off!

My only experience of it on a 1 Series included a new battery after just over 4 years and a new starter motor after just over 6 years.

After that I turned it off every time I used the car!

It's a hateful invention.

ronk · Post by **ronk** » Tue Jan 08, 2019 10:05 pm

Don't worry - The system hasn't worked on our 335xd for weeks either - there are conditions that have to be met before it works - Temperature/Battery level for starters (no pun intended)

Personally I don't like it and I don't think it saves any significant amount of fuel.

Smartbear · Post by **Smartbear** » Tue Jan 08, 2019 10:09 pm

It’s possible to code this function with Carly so it remembers its last selected state instead of defaulting to “on” every time the car’s started

Rob

Busterboo · Post by **Busterboo** » Wed Jan 09, 2019 12:14 am

Mr Tidy wrote: ↑Tue Jan 08, 2019 8:48 pm Be grateful it's off!
It's a hateful invention.

ronk · Post by **ronk** » Wed Jan 09, 2019 12:20 am

I didn’t realise they fitted it to the E89 - My 2016 35is doesn’t and nor did my previous 2010 3.0l have it fitted.

warmasice · Post by **warmasice** » Wed Jan 09, 2019 1:52 am

Be glad it doesn't work!

enzed4 · Post by **enzed4** » Wed Jan 09, 2019 6:05 am

Does it show up as an option in a VIN search?
OP, I had stop/start in a work toyotal corolla and it stopped working a while before the battery did. But as others have pointed out, the Z4 stop/start seems dependent on other factors such as temperature (and you're in the middle of winter at the moment) so it may be related to that instead.

Smartbear · Post by **Smartbear** » Wed Jan 09, 2019 8:17 am

ronk wrote: ↑Wed Jan 09, 2019 12:20 am I didn’t realise they fitted it to the E89 - My 2016 35is doesn’t and nor did my previous 2010 3.0l have it fitted.

The 6 cylinder cars never had it Ron

Rob

ronk · Post by **ronk** » Wed Jan 09, 2019 10:58 am

Smartbear wrote: ↑Wed Jan 09, 2019 8:17 am
ronk wrote: ↑Wed Jan 09, 2019 12:20 am I didn’t realise they fitted it to the E89 - My 2016 35is doesn’t and nor did my previous 2010 3.0l have it fitted.
The 6 cylinder cars never had it Ron
Rob

As I suspected!
If it was such an environmental and fuel saving boon as they suggest, then surely the bigger engines / less economical cars would have benefited more?

Smartbear · Post by **Smartbear** » Wed Jan 09, 2019 2:37 pm

ronk wrote: ↑Wed Jan 09, 2019 10:58 am
Smartbear wrote: ↑Wed Jan 09, 2019 8:17 am
ronk wrote: ↑Wed Jan 09, 2019 12:20 am I didn’t realise they fitted it to the E89 - My 2016 35is doesn’t and nor did my previous 2010 3.0l have it fitted.
The 6 cylinder cars never had it Ron
Rob
As I suspected!
If it was such an environmental and fuel saving boon as they suggest, then surely the bigger engines / less economical cars would have benefited more?

I suspect it might be tied in with the fact the bigger engine takes a lot more out of the battery to spin it over to start so stop/start is probably not sustainable for that reason

Rob

ronk · Post by **ronk** » Wed Jan 09, 2019 3:08 pm

Smartbear wrote: ↑Wed Jan 09, 2019 2:37 pm
ronk wrote: ↑Wed Jan 09, 2019 10:58 am
Smartbear wrote: ↑Wed Jan 09, 2019 8:17 am

The 6 cylinder cars never had it Ron
Rob
As I suspected!
If it was such an environmental and fuel saving boon as they suggest, then surely the bigger engines / less economical cars would have benefited more?
I suspect it might be tied in with the fact the bigger engine takes a lot more out of the battery to spin it over to start so stop/start is probably not sustainable for that reason
Rob

I don’t think that’s the reason as our 335xd has a six cyl Diesel engine - I would think that would take a lot more energy to spin than the petrol alternative?
(Higher rotating mass and compression ratio)

Never mind it’s not a system I miss

Pbondar · Post by **Pbondar** » Wed Jan 09, 2019 6:17 pm

Stop / Start allows the manufacturer to squeeze through the various mpg drive cycles especially the urban mode.

I guess if you are in stop start traffic crawling though a city etc it would help...

If you just stop at intersections in the countryside it’s a waste of time..IMHO..

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