[ADE335D]

Hi all, I've recently bought a 2016 335d and so far love it.
It's my fourth BMW so a loyal patron!!
This is the first auto gearbox I have had and love it!

So, the stop/start function is annoying but I see the benefits, but on a few occasions, I have been sitting at the traffic lights, foot on break, gearbox in D and engine stopped; when about to move off, lift off the break and the gearbox goes into park! Is this normal? Should I be putting it in park when waiting at lights?

Thanks in advance.

[xenon]

No not normal. And it's brake

[lethbridge]

Not heard of that issue before - no you you shouldn't be putting it in Park and Stop/Start obviously shouldn't either! Sounds like a trip to a dealer for that one although personally I'd code out Stop/Start and then the problem sounds like it will go away (assume it doesn't drop into P with Stop/Start disabled) so that is probably the cheapest fix unless you really want Stop/Start...

[ADE335D]

Originally Posted by xenon

No not normal. And it's brake

Oops, yes. My speeling is oarful

[ADE335D]

Originally Posted by lethbridge

Not heard of that issue before - no you you shouldn't be putting it in Park and Stop/Start obviously shouldn't either! Sounds like a trip to a dealer for that one although personally I'd code out Stop/Start and then the problem sounds like it will go away (assume it doesn't drop into P with Stop/Start disabled) so that is probably the cheapest fix unless you really want Stop/Start...

Thanks for the reply.

Not interested in the stop/start to be honest, so will look at that.

[jackstrath]

Posting your topic, literally moved this one with a sim issue off the bottom of the first page and onto the 2nd

https://f30.bimmerpost.com/forums/sh....php?t=1644312

[xpro]

Get the start stop disabled. More harm the good long term

[thescouselander]

I agree - get the stop start coded to default to off as it's positively dangerous IMO. On my car it stops the engine before the car has completely stopped and it can kick in when trying to get out of junctions.

[ADE335D]

Thanks for the replies.

I've just bought an OBD 2 adaptor and will use bimmercode to turn the stop/start off.

[doncarlyon]

Just use Sport mode... start-stop is disabled and your throttle actually works

[Michael340i]

Originally Posted by xpro

Get the start stop disabled. More harm the good long term

Is that based on a lot of research into car failures, or is it just an instinctive opinion?

[xpro]

Originally Posted by Michael340i

Is that based on a lot of research into car failures, or is it just an instinctive opinion?

Hours and hours of research and based on 15 years experience working with VAG cars as an engineer.

The sole purpose of the start stop was designed to reduce the emissions and reach the low co2 quota.

Its the only way the manufacturers are able to further bring down the co2 levels.

Manufacturers dont care if you car breaks down, or what happens in the long term. You will have to pay for it yourself in the long run.
Same with dpf/egr systems.

To give you an example of a 320d LCI E90 vs E90 LCI without start stop. ( same car, same engine)

128g/km vs 109g/km. The only difference is the start stop. Simply from calculated values and predictions of the car being switched off vs idling in traffic.

Car being switched off versus ticking over will simply produce less emissions.

But think of the potential damage, increased wear and tear, starter motor usage, and I'm not even going to mention about what it does to turbo chargers if the car is driven under boost and then suddenly stopped when you reach the traffic lights.

[Michael340i]

Originally Posted by xpro

Hours and hours of research and based on 15 years experience working with VAG cars as an engineer.

The sole purpose of the start stop was designed to reduce the emissions and reach the low co2 quota.

Its the only way the manufacturers are able to further bring down the co2 levels.

Manufacturers dont care if you car breaks down, or what happens in the long term. You will have to pay for it yourself in the long run.
Same with dpf/egr systems.

To give you an example of a 320d LCI E90 vs E90 LCI without start stop. ( same car, same engine)

128g/km vs 109g/km. The only difference is the start stop. Simply from calculated values and predictions of the car being switched off vs idling in traffic.

Car being switched off versus ticking over will simply produce less emissions.

But think of the potential damage, increased wear and tear, starter motor usage, and I'm not even going to mention about what it does to turbo chargers if the car is driven under boost and then suddenly stopped when you reach the traffic lights.

Thanks, had to ask because so many opinions on forums aren't backed up by any credible data.

Manufacturers typically ensure their vehicles last 10 years, then in 'average' usage, everything goes wrong together (there's no point making a component that lasts 20 years if the expected life of the vehicle is 10 years)

I know that BMW engineers changed (upgraded) engine bearings, battery and starter motor to take account of stop start, and added new sensors and electronics, does it look to you like there are some components that they didn't think to change?

There is massive logic in cars so that the stop start doesn't operate if:

- The car is coasting (manual transmission or ZF8 EcoPro coasting)
- Brake vacuum reading is too low
- Insufficient brake pedal pressure is being applied to hold the vehicle stationary (automatic transmission)
- Stopping on a hill/downhill with a 12% or greater gradient
- Steering angle is more than 6 degrees
- Steering wheel moved after approximately one second of coming to a stop
- Stop/start not yet be activated by going over a speed of 5mph for automatics, 3mph for manuals since the last engine switch off
- Accelerator pedal is being pressed (engine must be at idle speed only)
- Car in reverse
- Car in Sport or Sport+
- Engine is not up to temperature
- DPF being purged
- Poor quality fuel detected
- Transmission adaptation is active (automatic transmission)
- The hydraulic pressure accumulator is not yet up to pressure (automatic transmission)
- Stop-and-go traffic - system is only activated by driving over 5mph for automatics, 3mph for manuals
- Battery charge is low
- Outside temperature is colder then 3 deg/C
- Outside temperature above 35 deg/C and the air conditioning system is on
- Fogging of the windscreen is detected by the IHKA system
- Climate control system is on but passenger compartment has not yet reached desired temperature
- ABS system was used when coming to a stop

… these are just some of the obvious ones, have y9ou encountered problems that indicate they forgot about managing turbo lubrication and cooling?