Hi Guys! Been meaning to ask the forum! Does anyone know how the stop/start function works? It seems very 'random' and I can't determine what initiates it? Is it temp, miles driven, gear changes etc?? Thanx in advance AL
As I have said recently in another post: Auto Stop/Start will indeed appear to have a mind of it's own as that feature is dependant on a whole raft of parameters such as outside temperature, using heated seats/steering wheel and rear screen de-mister - as well as the more obvious state of battery charge and the engine coolant and oil temperature. I'm sure that @Peter will happen upon this thread and give us a more succinct explanation - but I would sum up by saying just forget about it - some BMW things are just 'Beyond our Ken'. * At this time of year my Stop/Start is completely unpredictable - so I switch it off as soon as I set off. If I subsequently select ECO-PRO the damn thing re-sets itself. * Who is this Ken chap anyway? - he's pretty dim IMHO.
Well you did ask! Under certain conditions the automatic engine start-stop function must be suppressed: Vehicle is rolling (only vehicles with manual transmission) Vacuum for the brake power assistance too low (only vehicles with manual gearbox) Brake pedal not operated firmly enough, the vehicle is therefore not detected as being sufficiently stopped (only vehicles with automatic transmission) Vehicle is stopped on inclines/downhill gradient > 12% Applied steering angle > 6° Steering wheel movement not completed (otherwise insufficient steering servo) Vehicle with manual transmission was not driven with speed of > 5 km/h after the last engine shutdown Vehicle with automatic transmission was not driven with speed of > 9 km/h after the last engine shutdown Engine not running at idle speed (accelerator pedal is operated) Reversing Engine operating temperature too low Carbon canister is being flushed Inadequate fuel grade Active transmission adaptation (only vehicles with automatic transmission) Hydraulic impulse storage not yet loaded (only vehicles with automatic transmission) Stop-and-go traffic State of charge of the battery too low Ambient temperature below +3 °C Ambient temperature above +30 °C (with air conditioning switched on) Rain-light-solar-condensation sensor identifies condensation on the windscreen Air conditioning switched on, however passenger compartment not correspondingly heated up or cooled down Braking occurred with anti-lock brake system (ABS) Deactivators When a precondition for deactivation is present the automatic engine start-stop is deactivated. The scenarios below are produced dependent upon when a precondition for deactivation has occurred for the automatic engine start-stop: Engine still runs and is no longer automatically stopped Engine was automatically stopped and starts again automatically Engine was automatically stopped and no longer starts automatically (the Check Control message "Automatic Start/Stop function OFF" is shown and the Automatic Start/Stop function button must be operated for engine start) The following deactivators may occur: Driver absence detected Engine start did not take place after starting Engine compartment lid unlocked Fault relevant to automatic engine start-stop on engine, transmission or components involved in automatic engine start-stop was detected Bus communication malfunction Automatic engine start-stop function has been deactivated by the automatic engine start-stop function button Automatic engine start-stop was deactivated by diagnosis system Vehicle is in transport mode Engine has been stopped An example of deactivation with subsequent switch-on request: At automatic engine shutdown, the automatic engine start-stop function is deactivated by the automatic engine start-stop function button The engine starts automatically There is no further automatic engine shutdown as the Automatic Start/Stop function remains deactivated
^ ^ ^ ^ There we have it. Battery condition (State of Charge) is often involved, even during the same drive, due to some of the other parameters. Peter
Oh and here's the switch on prompts in case you are wondering!... It may also be necessary to start the engine when: Vehicle is not stopped sufficiently by released brake pedal (only vehicles with automatic transmission) Steering wheel is moved Engine not running at idle speed (accelerator pedal is operated) Transmission changes from P to D. Previously, the driver had to change from position D to position P to take his foot from the brake pedal while the engine was automatically stopped (only vehicles with automatic transmission). Transmission changes from D to N or R (only vehicles with automatic transmission) Vacuum for the brake power assistance too low (only vehicles with manual gearbox) State of charge of the battery too low Ambient temperature above +30 °C (with air conditioning switched on) Rain-light-solar-condensation sensor identifies condensation on the windscreen Evaporator temperature too low to guarantee sufficient climate control Special case: Driver's seat belt is still fastened and driver's door is opened (for instance when using a dummy in regions without mandatory seat belt usage)
Sorry cannot agree Imagine your battery condtion is duff, it's winter and you have heater and demister on, and using start stop tips it over the edge and the battery is screwed you wopuld be gateful that start/stop (not a crucial function) didn't work, I think
Fair enough but ..... I didn't rate the post 'agree' because it was crap because it didn't work predictable every time. I think that the whole Stop/Start concept is a sop to energy saving which BMW can then say 'Look, we're trying.' Some folks say the same about DPFs too. So I switch Stop/Start off - especially in the Winter.
I would go with low battery this time of year anyway. Can you charge it fully overnight and see how the stop-start behaves after.
My start stop worked perfectly in the summer, now that the lights, fan and demister are on when I first get start the car it doesn't work at all for at least 20 minutes of driving (fully charged battery probably doesn't make much difference as the above usage hammers it)
I say bring back the turbo timer!... perhaps market it as the 'Greta T' this time I've coded my stop/start to remember the last setting so effectively it's always switched off... just conscious of uninterrupted oil supply to the turbo's
I just did the opposite so mine comes on automatically, as being in London means sitting in traffice quite often, but that might be different since midnight (if people are going to be sensible and follow the lockdown) Before I get asked why I go out, it is only to do shopping and pick up nurses scrubs for the NHS - a good excuse to get out and drive a bit !
That's fair comment - London is a different ball game completely. And more power to your elbow, helping the NHS. Today I had a loan car from my local main dealer - a brand new 218i M-Sport with 2600 miles on the clock. Been sitting for 6 days in their yard - first thing I spot when I fire it up was a message 'Change Battery' - I looked again to be sure - it definitely said CHANGE and not charge. Anyhow it started up fine and away we went - across the centre of Aberdeen - I didn't switch off the Stop/Start as I would normally have done - and surprise, surprise the confounded thing turned off the engine at every set of traffic lights and roundabout. Totally baffling - as I had on the heated seats and the rear-screen too. So I very quickly became fed up of the thing and switched it off. BMW -1 Logic - Nil
This was for fitting the damaged 'auxiliary dampers' that I had a 'difference of opinion' about whether they were mechanical parts or not and whether they would be covered by my Insured Warranty. Did you miss the pics I posted last month? Thank goodness the 218i had heated seats - temperature hovered around zero all day.
I'm wondering if they had let the battery discharge while in transport mode and got the 'official' warning to replace, as it had dropped below 35% SoC. Perhaps they have simply charged it and not yet replaced and re-registered a new battery. Leaving it until they sell the car on? Peter
Ahhhh, makes sense now - I did see your post(s), but had forgotten the situation.....old age, eh... It was very frosty overnight, in fact at 9:30 a.m. it was still -8 degrees - lovely day behind it and I'm just back in from my 'exercise' walk in beautiful sunshine. The e60's still frozen over though.
That's interesting. I had my F30 serviced and MOT'd last week. I booked well in advance so that I would get a courtesy car, but was told that the dealership haven't provided any since March 2019. So I ended up booking a 'waiting service', which was OK as I was seated in the large, well ventilated showroom. The other positive was that the main dealer matched a quote from an Independent, which they have been doing all along.
