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Discussion Starter · #1 ·
I've got a 2008 451 Pure. So, I recently replaced my clutch actuator after the one that was on the car when I bought it failed (worm gear broke). I got the new part online and it looked slightly different, nicer milled surface instead of a sort of rough cast on the casing compared to my original actuator. This may or may not be related to the problem.

Since I installed it, I've had trouble with the car basically dumping the clutch when starting to move, whether into 1st or Reverse. It sometimes makes a bang sound and moves far faster than it should without me pressing the gas pedal. Often when I start moving it slams the clutch, retracts it for a moment, and then clutches in again. It also lurches downshifting from 2nd to 1st. I recall it occasionally doing this before, though it seems to be worse now.

I've tried adjusting the position of the clutch actuator and it improved the situation for a couple days, until once it failed to clutch in and I rolled back when starting on a hill. After that it seems like it's overcompensating and slamming the clutch even harder.

Has anyone ever experienced this problem before? Is it probably the fault of the actuator itself, or maybe a sensor or the shifter motors? Nothing I can do in my driving style EG holding the brake to start, getting on the gas very gently, seems to help. It also shifts totally fine when it's moving, the problem is pretty much exclusive to starting to move from a standstill or downshifting into 1st. Is there a way to force a fresh transmission teach-in? I know you can teach the transmission when the 3 bars come up, but that only seems to happen when the car decides the transmission is bad enough, which it hasn't yet.
 

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Welcome to the forum. Is it a OEM actuator? It looks different then the original one you had. That might be your issue.

66270
 

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Discussion Starter · #3 ·
It looks just like the one in that picture, I assume making it the Sachs version. It came with all official labeling (for Smart GmbH IIRC) This car was a 2008 preorder for the united states so I don't know if that would mean the originally installed actuator would be different. Frustratingly the issue has also been somewhat intermittent, on some days it would be fine (until recently) but I could never get it to go away consistently. I did pay a lot less than $542 for mine, but your picture looks quite identical to the new one I bought (and still slightly different from the old one, unless I'm fooling myself and it was just a lot of corrosion).

Has anyone else encountered this particular clutch dumping issue from a knockoff clutch actuator before, or is anything else known to cause it? I'd hate to buy a redundant $500 part and find that it's not the source of the issue.
 
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