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Freewheeling/coasting then stop/ start engine

MAS100 Apr 9, 2018

  1. MAS100

    MAS100 New Member

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    Had my new 2.0TFSI for just over a week. Coming down a very long gentle decent in Efficiency mode the car freewheels/coasts along then to my surprise at around 50mph the stop/start cuts in so the engine stops and the green A symbol shows. Tacho drops to READY position. Car steers ok so I'm still in control. Is it meant to do this or is it a fault? It's now done it at least 4 times!
     
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  3. Daggerit

    Daggerit Well-Known Member Team Floret Silver TFSI Owners Group Team V6 Audi S4 Audi Avant Owner Group quattro

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    If you’re in efficiency mode then it’ll do those kinds of fuel saving things, nothing to worry about!


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  4. blackb9er

    blackb9er Active Member Team Brilliant Black Team V6 Audi A4 quattro TDi

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    Lots of Coasting/freewheeling is normal in efficiency mode but I've never had the stop start kick in at that speed. I think you might have a problem. Maybe take it back to the dealers and double check with them that everything's ok.

    Do you have the manual or S-Tronic?
     
  5. MAS100

    MAS100 New Member

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    Thanks. Stronic. I couldnt see anything about this in the manual. And nothing on this forum so I thought I'd ask.
     
  6. Paul Golding

    Paul Golding Active Member Team Brilliant Black TFSI Owners Group saloon Audi A4 S tronic S-line owners group

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    Mine has done this quiet a lot, even just coasting towards a roundabout or a set of lights. Sounds normal to me.
     
  7. JRF

    JRF Member

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    All fine I have this even in normal mode car cuts out when needed even at speed all part of saving fuel
     
  8. blackb9er

    blackb9er Active Member Team Brilliant Black Team V6 Audi A4 quattro TDi

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    Interesting...must be different for the diesels then
     
  9. MOA4B9

    MOA4B9 Member Team Daytona TFSI Owners Group Audi A4 S tronic S-line owners group

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    I've got the 2.0TFSI and never had the start/stop kick in when driving at speed, only in the last meter or two before the car comes to a complete stop. It sounds strange for it to kick in while driving at speed. I would double check this with audi dealer.
     
  10. gforrow

    gforrow Member

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    My 2.0TFSi does it all the time. Get a reasonable speed, say on the motorway or dual carriageway, get to a steep enough slope to be able to maintain speed on it's own, and the start/stop works. Need the brakes, the engine restarts, speed dropping, engine restarts. Even does all of this under cruise control as well. Bit unnerving to watch, but works well. Sometimes only drops to idle, sometimes stops totally, to ready indicator. As the steering is electrically assisted, that won't be affected, and by the time you need the servo on the brakes to work, the engine is running again.

    Quite impressed.
     
  11. DohNut

    DohNut Well-Known Member Team Daytona TFSI Owners Group Audi A4 Audi Avant Owner Group

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    I take it all this happens in Efficiency only?
     
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  13. Candell

    Candell Active Member Audi A4

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    That would freak me out, my diesel often coasts but has never turned the engine off at speed. Whether it stop/starts at a stop is under my control depending on how hard I press the brake pedal, it never stops the engine by itself.
     
  14. BigAardvaark

    BigAardvaark Active Member Team Scuba Audi A4

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    Not sure I'd like this - be forever thinking "starter motor failure or start/stop failure = NO BRAKES"
     
  15. cuke2u

    cuke2u Well-Known Member TFSI Owners Group saloon Audi A4 S-line owners group

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    Never seen it happening at speed with my car either. I drive in auto mode more or less all the time..
     
  16. SimonAshley

    SimonAshley Active Member

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    This happens in all modes!

    I found I get better MPG in Dynamic so keep it in dynamic!

    Still when you take your foot off the accelerator the the engine will turn off (intelligent coasting) can be very annoying when coming to a roundabout as car can take longer to react to drive on!

    You can disable this in the MMI. Go into the drive select and press left on the click wheel go to efficiency assist then it has a tick box intelligent coasting deselect it!
    Pictures:


    [​IMG][​IMG][​IMG][​IMG]

    Audi A5 S-line Sportback 2.0TFSi Scuba Blue
     
  17. DohNut

    DohNut Well-Known Member Team Daytona TFSI Owners Group Audi A4 Audi Avant Owner Group

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    Thanks for clarifying. Will be one of the first things I change in the settings I think.
     
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  18. BigAardvaark

    BigAardvaark Active Member Team Scuba Audi A4

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    Yeah, mine does the coasting (well, did, disabled now) but the engine doesn't switch off at 50mph.

    Are people getting the rev counter dropping to idle (coasting) confused with actually switching off? (EDIT - re-read the replies, seems not, scary!)

    Is this a newer TFSi feature?
     
  19. gforrow

    gforrow Member

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    Not confused, sometimes it drops to idle, and sometimes it drops to the ready mark.

    I won't be turning it off. I'm sure that so much testing has occurred, the chances of failure are next to zero. If there was potential for a safety concern, I'm sure the relevant authorities wouldn't allow it.

    I don't understand why anyone would buy a "modern" car, and then start turning all of the "modern" features off, sort of defeats the objective a bit for me, however we are all different, appreciate that. Until it fails, I am happy to trust the engineering behind the car. One day, we will have to trust it so much it drives for us, you won't be turning off the features then :)

    I believe my car turns off in all modes, never really paid attention to it. Other than a pregnant pause sometimes at roundabouts, i.e. it shuts off just as you want to go, and there is a split second delay, I don't have any concerns with it. Adapt my driving style appropriately, and use the functions of the car. Most of the miles in the car are in Milton Keynes, loads of roundabouts, so for anywhere in the country, this is where it would be the most annoying :)
     
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  20. BigAardvaark

    BigAardvaark Active Member Team Scuba Audi A4

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    I've turned coasting off as I drive using engine braking, after 30 years it's very hard to change.

    You do realise most of these features are to satisfy emission regs, etc, and aren't for your benefit as a driver at all?
     
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  21. gforrow

    gforrow Member

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    I use engine braking as well when I can, flick the paddle down a gear :), I too have been driving for 30 years. This though is my first auto, after all manuals, apart from hire cars. I still don't like autos, no fun, but then driving in the South East is no fun anyway. Sad to say in this day and age, it's all about making it easier getting from A to B for me. Now if I lived further north, and could enjoy the peaks or lake district for some spirited driving, then that would be different.

    I deliberately specced a car, I left an outdated A3 for the A4 to enjoy some new tech. Yes it's about emissions, is that a bad thing? The environment is in a **** state already. I'm not a tree hugger by any means, in fact I work in the oil and gas industry, but anything we can do now to improve the future, we should be. Currently working in Saudi, emissions checks don't exist, clouds of diesel smoke everywhere, and it is bad, almost makes breathing the UK air worth it.

    I reckon we should all just enjoy driving the car, when we can, using whatever tech we chose to use. I've got matrix lights, hopefully when I get home I am confident enough in the tech to leave them on, and let them work their magic. :)

    At least the OP knows his car is faulty
     
  22. BigAardvaark

    BigAardvaark Active Member Team Scuba Audi A4

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    The last I'll write on this - you missed my point. You didn't spec this tech, Audi did. In fact, try and "un-spec" it.
     
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  23. Fozzie1960

    Fozzie1960 Active Member TFSI Owners Group Team Tango saloon Audi A4 quattro S tronic S-line owners group

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    I drive in dynamic mode all the time and I have never experienced the start/stop kicking in at any speed whilst the car is coasting.
     
  24. Tashfeen

    Tashfeen S4 - the smile per mile machine! Team Glacier TFSI Owners Group Team V6 VCDS Map User Team Scuba Supercharged Audi S4 Audi A3 Black Edition quattro

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    I only last week bought missus an A3 8V (Tfsi) and the first thing I noticed driving on my way back was the car 'coasting'. However, it hasn't cut out for me, the revs do drop to 900rpms but no start/stop activates (yes the A3 has start stop). Have couple of long journey planned in next couple of weeks so will keep an eye on if it does.

    S4 on the other hand does not even have this word in her dictionary


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  25. Tashfeen

    Tashfeen S4 - the smile per mile machine! Team Glacier TFSI Owners Group Team V6 VCDS Map User Team Scuba Supercharged Audi S4 Audi A3 Black Edition quattro

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    Oh, and I have driven the car mostly in Efficiency mode and the dynamic and individual were to check the responsiveness etc etc so can't comment if it coasts in all the other modes or not.


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  26. SimonAshley

    SimonAshley Active Member

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    Just to try and clear up confusion.
    As about I have intelligent coasting on!When the car is coasting the revs drop off to the ready mark on the dash, same as they do for start stop function, it saves fuel as engine is not running.

    Been out today and it has done it several times at 50-70mph the engine is off but it is in (start stop) ready position on rev counter, so after a period of time and the car starts to slow or I demand more speed the engine kicks back in.

    I think it's a clever fuel save feature, not sure why some think it's a fault or dangerous.

    Audi A5 S-line Sportback 2.0TFSi Scuba Blue
     
  27. pagenotfound

    pagenotfound Active Member Team Moonlight TFSI Owners Group Audi A4 Audi Avant Owner Group quattro S-line owners group

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    I presume that this is new with MY18 cars as my 2016 2.0 TFSI doesn't cut out the engine when coasting. On mine, with the car stopped and the tacho at 'ready', even a slight turn of the steering wheel is enough to fire up the engine again.
     
  28. q5man

    q5man Mythos Appreciator Team Mythos TFSI Owners Group Gold Supporter quattro Audi Q5

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    Agree, never had stop/start kick in whilst coasting in efficiency


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  29. q5man

    q5man Mythos Appreciator Team Mythos TFSI Owners Group Gold Supporter quattro Audi Q5

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    Wonder if this is VERY new or only on certain models as my 2018 Q5 doesn’t have the intelligent cruise option


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  30. q5man

    q5man Mythos Appreciator Team Mythos TFSI Owners Group Gold Supporter quattro Audi Q5

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    Start / stop often won’t kick in in the first few weeks of ownership, has certainly been the case for my last 3 Audi’s.


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  31. Paul Golding

    Paul Golding Active Member Team Brilliant Black TFSI Owners Group saloon Audi A4 S tronic S-line owners group

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    That's exactly how mine works and I'm almost certain it does it regardless of the driving mode selected. If it's set in the MMI as above, it just works. OK, the first few times I was a little freaked seeing the rev needle go to "ready", yet still having steering and brakes, but now I'm used to it and take no notice.

    Funny thing is that south east Essex isn't renowned for its hills, but the feature still kicks in quite a lot. Pretty clever stuff really.
     
  32. q5man

    q5man Mythos Appreciator Team Mythos TFSI Owners Group Gold Supporter quattro Audi Q5

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    All,
    Must apologise and retract the above, my Q5 DOES have Intellegent cruising, but as I have only done 600 miles, haven't had start/stop kick in whilst cruising, have only had coasting or start/stop when actually stopped. The option is ticked in MMI, so will no doubt show itself when ready :thumbs up:
     
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  34. Urban Sports

    Urban Sports Active Member

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    Yep my MY2018 2.0 TFSI does this, it's hardly noticeable, in fact you'd only know by looking at the rev counter.
     
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  35. MarkyBadi

    MarkyBadi New Member

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    Does this apply to manuals?? Sounds like a great eco option.
     
  36. NickGun

    NickGun Active Member Team V6 Audi A4 Audi Avant Owner Group quattro TDi S tronic

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    On our 2016 B9 Avant the freewheel / coasting works as described by most (dropping revs to 500rpm) on downhill gradients when engine is warmed up enough, it can be made to coast by holding the upshift paddle for a second or more. It has never gone into start stop while in this freewheeling mode, over some very long motorway, autoroute and autostrada journeys too.

    Will be able to test directly as our current Quattro Avant lease is up early next month and its being replaced with a 2018 B9 Allroad, so will report back on if that coasts / freewheels differently.
     
  37. MAS100

    MAS100 New Member

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  38. DevSK

    DevSK New Member

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    Hi all, as the post above mentions, this feature is a new-ish technology called MHEV. Or Mild Hybrid Electric Vehicle.

    It's not like your usual hybrid vehicle where the electric motor can be used to drive the vehicle. It's more a feature consisiting of an enhanced starter motor & battery which is able to bring up the revs to the required level to match the coast speed after the engine switches back on. It will work up to 99mph I believe.

    I've been monitoring this on my MY18 2.0 TFSI since I've had it and think it's a brilliant feature. I think I owe the ability to get 47+ mpg to it for the large part.

    It's more than just a start stop system based on speed and gradient of the slope you're on. The car uses it's sensors (presumably the same sensors as the pre-sense system uses) to detect that the road ahead is clear enough for the MHEV to kick in. If not, it won't kick in. Furthermore, if you happen to catch up to another car or are approaching a roundabout for instance, it will anticipate that you need braking power so the engine kicks in.

    Also, depending on the battery charge level (and other factors) the MHEV may not kick in at all. I've tried forcibly getting it to work but clearly there's a lot more intelligence going on in the system which requires more than just me lifting off the pedal.

    On the DIS, if you're on the first tab (speed, mpg etc) if you scroll down to screen 3 which is the MPG screen, you'll see that when the car is coasting with the engine on, the consumption bar goes into the green battery area. This is charging the MHEV battery system.
     
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  39. q5man

    q5man Mythos Appreciator Team Mythos TFSI Owners Group Gold Supporter quattro Audi Q5

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    Just to add (if that is possible) to the VERY THOROUGH write up above, before my current MY18 2.0 TFSI, I had a 2016 A6 avant ultra (not Quattro) and whilst the start stop worked quite well, I found that during winter I ended up running the car in other modes (than economy) as otherwise the freewheeling bit could be a bit hairy in that the car would speed up on downhills, and not have the engine braking effect of feeling of being completely in control going round bends (more so downhill). Whilst I haven’t had the Q5 in winter yet, the whole ‘intelligence) of the system and car generally is vastly improved. I doubt I will need to turn it off ever. That said the intelligence kicks in in the varying drive select modes anyway
     
  40. psychopomp1

    psychopomp1 Active Member

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    I'm guessing even if you have stop-start disabled via the physical button then this coasting feature is still activated, provided you haven't switched off 'intelligent coasting' in the MMI?
     
  41. q5man

    q5man Mythos Appreciator Team Mythos TFSI Owners Group Gold Supporter quattro Audi Q5

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    I believe that is the case. I am 1200 miles in on the Q5 and am yet to experience engine switching off whilst driving, only usual stop/start scenarios. Intelligent coasting is turned on in MMI. I should add that longest "motorway" journey so far has been about 25 miles, so need a nice long run really.
     
  42. MAS100

    MAS100 New Member

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    An update from me. My Audi app under "Standard Equipment" and then "Other" says " Hybrid propulsion system MHEV".
     
  43. ScottishA4B9

    ScottishA4B9 Well-Known Member Team Daytona saloon Audi A4 TDi S-line owners group Manual

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    @gforrow I can assure you that it most definitely IS dangerous. I’ve lost count of the number of times I have been slowing for a roundabout or junction, then seen a space and proceed out only for the laggy stop start then deciding to cut in leaving me with no power and nearly being broadsided by another vehicle!!! You then have to apply the brakes to come to a complete stop before manually restarting the engine!! Cue blasts of the horn from other drivers. How nobody has hit me on a number of occasions is anybodys guess.
    This is despite the stop start being manually disabled via the button as well!
    There are numerous cases of people having the same issue on here and all the demo cars I have driven have done the same!
    Absolutely awful system and down right dangerous!!! My only fault of the car so far.
     

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