thesmartclub - the world's largest independent club for all things smart thesmartclub - the world's largest independent club for all things smart thesmartclub shop - the world's largest independent club for all things smart
+ Reply to Thread
Page 1 of 4 1 2 3 4 LastLast
Results 1 to 10 of 40
  1. #1

    Default Car Occasionally Won't Change Up Gear

    Hi all

    I just registered, first post, shame it's asking about a problem!

    We just picked up our smart car on Monday, a 2006 700cc Grandstyle. We had a 2004 600cc a few years ago so I'm well aware of the laborious and often dangerous gear changes. However, I've noticed something odd happen twice that I hope you could advise on.

    I drove the car on auto this morning for about an hour, mostly on dual carriageways at about 50-70. At one point I had to floor it to keep the car at a steady speed going uphill, refrained from giving the guy behind a 1 finger thank you, despite him seeming to try to push me along by the rear bumper in the pouring rain. When I pulled over to the slow lane, the car wouldn't change up gear, so I ended up doing it manually.

    I put it back in auto and pulled off at my junction, and had to navigate several roundabouts and junctions. The car didn't want to change up gear. I'd drive along in 1st at 4000 rpm, it was happy to stay like it, despite me lifting on the accelerator. I then took it up to about 5000 rpm and it changed to 2nd, and the same 5000 rpm were needed to get it into 3rd.

    Once I had parked, done my business, and returned to start the car again, it drove normally, changing up gear at reasonably low revs. Later on in my drive I had to rev it to kick down gear to overtake a car to make my junction, but same thing happened. The car wouldn't change up gear until it was revving around the 5000 rpm range despite me practically taking my foot off the accelerator and letting the car freewheel. I pulled over, restarted the car, it the drove normally.

    I initially wondered if it was low on transmission fluid, as I have an old american car that struggled with gear changes when hot due to low fluid. My wife also had a horrible Citroen sensodrive that would regularly stick in gear due to overheating box, and she'd have to park for 15 minutes to let it cool down. In this case, the fact it returns to normal immediately after a restart implies it's software.

    What do you lot think? I could take the car back to the dealer, but it's just the usual 2nd hand car sales site that would just have it sat in their yard for a week before saying they can't find anything wrong, and it's a 3 hour round trip for me so it's not what I want to do really.

    Cheers

    Chris

  2. #2
    Join Date
    Jun 2005
    Location
    Bristol
    Posts
    6,643

    Default Re: Car Occasionally Won't Change Up Gear

    Hello and to thesmartclub!

    Is the car changing gear normally when you move the stick yourself? It's not the best gearbox to use in auto - even now after 13yrs of smarting I still make the mistake of pressing the A button and then thinking "why do I do this to myself"
    Tony - Living life with Pure Passion, always with my finger on the Pulse

  3. #3

    Default Re: Car Occasionally Won't Change Up Gear

    Hi there

    The first time it did it, I used the manual mode to get off at the junction and it worked fine.

    I agree, auto mode is pretty rubbish but then I've never used a good semi-auto box. My wife only has an auto license, so I'm going to drive it in auto until I know it's working (as well as it can) and I can 'coach' her on how to use it to avoid the dreaded rolling out of a junction while it's trying to decide what gear to select.
    2006 Smart ForTwo Grandstyle

  4. #4
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    702

    Default Re: Car Occasionally Won't Change Up Gear

    It sounds to me like it actually thinks it is in manual. The gearbox will change up at the red line in manual mode.

    If you are sure you had "A" on the dash then I suspect a wet SAM but you need to get the fault codes read with a reasonably good diagnostic machine, preferably a Mercedes diagnostic but others such as Delphi will give you a good idea.

  5. #5

    Default Re: Car Occasionally Won't Change Up Gear

    Ah, I didn't realise it would change up in manual on the red line, that's really useful to know. I wonder if changing to manual or neutral, then back to auto would resolve it.

    A friend has one of those Chinese OBD readers that links to an android phone, are they capable of reading a Smart car?
    2006 Smart ForTwo Grandstyle

  6. #6
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    702

    Default Re: Car Occasionally Won't Change Up Gear

    Quote Originally Posted by chrisjcoe View Post
    Ah, I didn't realise it would change up in manual on the red line, that's really useful to know. I wonder if changing to manual or neutral, then back to auto would resolve it.

    A friend has one of those Chinese OBD readers that links to an android phone, are they capable of reading a Smart car?
    No. They do report basic stuff but none of them will talk to the gearbox control at all. I do know that Delphi does and obviously the Mercedes stuff does. I have no experience with others of a similar ilk.

  7. #7
    Join Date
    Feb 2006
    Location
    Hampshire
    Posts
    1,149

    Default Re: Car Occasionally Won't Change Up Gear

    To me it sounds as though it's operating entirely normally. It always hangs onto revs longer when cold and when going uphill and I have had 5 smarts with the same underpinnings.


    As J500ANT says, one of the many reasons why I never use the auto mode.

  8. #8

    Default Re: Car Occasionally Won't Change Up Gear

    Both times it happened the car had been driving for an hour or more, and was 3 bars on engine temperature. When warmed up I'll try high revs again, then see if it falls out of auto again. If it's easily repeatable, then that's something at least.

    The garage I bought it from is about a 3 hour round trip for me, which means taking 2 cars so I can get home and 2 wasted days of valuable weekends . The only other alternative is to pay a local garage to diagnose any faults because I haven't found any car friends with anything better than a cheap OBD reader!
    2006 Smart ForTwo Grandstyle

  9. #9
    Join Date
    Mar 2014
    Location
    Somewhere on the Wirral
    Posts
    968

    Default Re: Car Occasionally Won't Change Up Gear

    I wonder if the Gearbox Rotation sensor is OK...? We might be able to recommend a specialist if we had a rough idea of where you are.
    Last edited by Ocracoke; 9th November 2016 at 14:04.

  10. #10

    Default Re: Car Occasionally Won't Change Up Gear

    I live about 15 miles from Diss (Norfolk) and work in Ipswich (Suffolk), and I'm regularly in Colchester (Essex)
    2006 Smart ForTwo Grandstyle

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts