M6 jerky when cold
Discussion
Hi All,
Hoping someone might be able to provide me with some advice. I have recently purchased a 2006 M6, 37k on the clock. Since owning it has become really jerky when starting from cold. Always start in first and apply the throttle smoothly when pulling away but no matter what i do it always jerks until the clutch is fully engaged. I can only really describe it as sort of 'bunny - hopping'. Have had the SMG firmware updated and this made it slightly better but i still don't think it is right despite the specialist i bought it from telling me this is just how these cars are. So i took it to one BMW dealer in London, they said it probably needs a new clutch. They cannot diagnose any further without taking the clutch out. Took it to another BMW dealer who immediately said it needed a new differential which has been replaced under BMW extended warranty. Again, made it slightly better but I still not right.
Once warmed up, after about 5/7 mins all seems ok. I live in London so its immediately start/stop traffic when its cold and probably exacerbates the problem. I am loathed to pay for a new clutch at this stage as it doesn't slip when warm and under more load so makes me think it is something else??
Can any other M5/M6 owners tell me whether this really is a feature of the car when cold? I look like a bit of tool when driving it from cold with it lurching around!
Thanks in advance.
Cheers,
James
Hoping someone might be able to provide me with some advice. I have recently purchased a 2006 M6, 37k on the clock. Since owning it has become really jerky when starting from cold. Always start in first and apply the throttle smoothly when pulling away but no matter what i do it always jerks until the clutch is fully engaged. I can only really describe it as sort of 'bunny - hopping'. Have had the SMG firmware updated and this made it slightly better but i still don't think it is right despite the specialist i bought it from telling me this is just how these cars are. So i took it to one BMW dealer in London, they said it probably needs a new clutch. They cannot diagnose any further without taking the clutch out. Took it to another BMW dealer who immediately said it needed a new differential which has been replaced under BMW extended warranty. Again, made it slightly better but I still not right.
Once warmed up, after about 5/7 mins all seems ok. I live in London so its immediately start/stop traffic when its cold and probably exacerbates the problem. I am loathed to pay for a new clutch at this stage as it doesn't slip when warm and under more load so makes me think it is something else??
Can any other M5/M6 owners tell me whether this really is a feature of the car when cold? I look like a bit of tool when driving it from cold with it lurching around!
Thanks in advance.
Cheers,
James
cant help diagnose the issue... but I can confirm my car isnt like this and it pulls smoothly even when cold.... i always pull off in manual mode but even if i forget and pull in D (and thus 2nd) its fine.
I've been spending a lot of time in london lately so leaving it outside hotels etc and its always fine even from cold.
My car had done nearly 100k so your def should be juddering.
I've been spending a lot of time in london lately so leaving it outside hotels etc and its always fine even from cold.
My car had done nearly 100k so your def should be juddering.
) and this had exactly the same symptoms as it spent lots of time on the motorway and the throttle adapted as such. After resetting the throttle it was worlds apart.it is a common problem of the smg box, my csl was the same but i wouldn't necessarily say it was that bad & when driving my mates M5 i actually found that was better.
might be worth doing a software re-set as suggested above.
on the csl you had to (if memory serves me correct) drive at 20mph
put the shifter into neutral
pull on both paddles for circa 10 seconds.
i used to do this periodically as the car was a daily driver & it used to get used to slurring the changes-a re-set sorted it out for track work.
might be worth doing a software re-set as suggested above.
on the csl you had to (if memory serves me correct) drive at 20mph
put the shifter into neutral
pull on both paddles for circa 10 seconds.
i used to do this periodically as the car was a daily driver & it used to get used to slurring the changes-a re-set sorted it out for track work.
cragswinter said:
it is a common problem of the smg box, my csl was the same but i wouldn't necessarily say it was that bad & when driving my mates M5 i actually found that was better.
might be worth doing a software re-set as suggested above.
on the csl you had to (if memory serves me correct) drive at 20mph
put the shifter into neutral
pull on both paddles for circa 10 seconds.
i used to do this periodically as the car was a daily driver & it used to get used to slurring the changes-a re-set sorted it out for track work.
What you have described is the diff calibration that you do after new tyres or air fill. The SMG reset needs to be done by a tech and should only really be done after a new clutch.might be worth doing a software re-set as suggested above.
on the csl you had to (if memory serves me correct) drive at 20mph
put the shifter into neutral
pull on both paddles for circa 10 seconds.
i used to do this periodically as the car was a daily driver & it used to get used to slurring the changes-a re-set sorted it out for track work.
Eddie
Thanks everyone for their replies. To clarify I am pretty sure it is not the engine as this does not race when idling nor indeed does it when giving it any revs in neutral. It fells more like when taking off from standstill the clutch is being applied and then removed repeatedly- when it is fully engaged it pulls absolutely fine, no jerkiness at all. Also when cold and changing gears it makes a significant clunk. Does that help anymore? I really need to take a ride in another M5/M6 to compare i suppose.
Haven't tried the SMG reset, may give that a go as have read about this before.
Haven't tried the SMG reset, may give that a go as have read about this before.
Eddie - just read some of your posts on the buyers guide, maybe won't do the reset then! Very interesting to read about the guide bush and release bearing - i have a good relationship with my local BMW garage who replaced the diff so i think i might take it back there for some more diagnostics. It just doesn't feel right to me and i have had a few M cars in the past so expect them to be a little rough when cold.
Cheers
Cheers
james_biggles said:
Thanks everyone for their replies. To clarify I am pretty sure it is not the engine as this does not race when idling nor indeed does it when giving it any revs in neutral. It fells more like when taking off from standstill the clutch is being applied and then removed repeatedly- when it is fully engaged it pulls absolutely fine, no jerkiness at all. Also when cold and changing gears it makes a significant clunk. Does that help anymore? I really need to take a ride in another M5/M6 to compare i suppose.
Haven't tried the SMG reset, may give that a go as have read about this before.
Sounds like the clutch issue in my buyers guide. Go forth and claim your new clutch.Haven't tried the SMG reset, may give that a go as have read about this before.
I have similar issues, except I regularly get a red cog and transmission fault warning. After 2 trips to one dealer ending each time with me refusing for them to remove the box to check the clutch, as they believed it was that, it is now at another dealer. Should be back later today, I'll let you know if the story is any different this time.
jonlcerb said:
I have similar issues, except I regularly get a red cog and transmission fault warning. After 2 trips to one dealer ending each time with me refusing for them to remove the box to check the clutch, as they believed it was that, it is now at another dealer. Should be back later today, I'll let you know if the story is any different this time.
Jonicerb - how did you get on, any progress? james_biggles said:
Hi All,
Hoping someone might be able to provide me with some advice. I have recently purchased a 2006 M6, 37k on the clock. Since owning it has become really jerky when starting from cold. Always start in first and apply the throttle smoothly when pulling away but no matter what i do it always jerks until the clutch is fully engaged. I can only really describe it as sort of 'bunny - hopping'. Have had the SMG firmware updated and this made it slightly better but i still don't think it is right despite the specialist i bought it from telling me this is just how these cars are. So i took it to one BMW dealer in London, they said it probably needs a new clutch. They cannot diagnose any further without taking the clutch out. Took it to another BMW dealer who immediately said it needed a new differential which has been replaced under BMW extended warranty. Again, made it slightly better but I still not right.
Once warmed up, after about 5/7 mins all seems ok. I live in London so its immediately start/stop traffic when its cold and probably exacerbates the problem. I am loathed to pay for a new clutch at this stage as it doesn't slip when warm and under more load so makes me think it is something else??
Can any other M5/M6 owners tell me whether this really is a feature of the car when cold? I look like a bit of tool when driving it from cold with it lurching around!
Thanks in advance.
Cheers,
James
Happened to me this morning James! Only had the car for two days and this morning was the coldest morning so I went downstairs and started the M5 (E61) and put it in reverse and started bunny hopping and was almost undriveable. The mad thing is it's had a new clutch at 49K and is now on 66K so I doubt it's a clutch issue, plus it's just had a service last week and given clean bill of health. Hoping someone might be able to provide me with some advice. I have recently purchased a 2006 M6, 37k on the clock. Since owning it has become really jerky when starting from cold. Always start in first and apply the throttle smoothly when pulling away but no matter what i do it always jerks until the clutch is fully engaged. I can only really describe it as sort of 'bunny - hopping'. Have had the SMG firmware updated and this made it slightly better but i still don't think it is right despite the specialist i bought it from telling me this is just how these cars are. So i took it to one BMW dealer in London, they said it probably needs a new clutch. They cannot diagnose any further without taking the clutch out. Took it to another BMW dealer who immediately said it needed a new differential which has been replaced under BMW extended warranty. Again, made it slightly better but I still not right.
Once warmed up, after about 5/7 mins all seems ok. I live in London so its immediately start/stop traffic when its cold and probably exacerbates the problem. I am loathed to pay for a new clutch at this stage as it doesn't slip when warm and under more load so makes me think it is something else??
Can any other M5/M6 owners tell me whether this really is a feature of the car when cold? I look like a bit of tool when driving it from cold with it lurching around!
Thanks in advance.
Cheers,
James
Anyone got any ideas as if it's a proper issue it's going back to the dealers to be fixed at their cost.
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