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pidgeonpost

Symptoms like clutch slip?

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I was talking to a fellow E60 owner last week. He says he's getting what you might describe as clutch slip on a manual gearbox, but this is an auto. He reports that this seems to happen in colder weather, and when setting off from cold. The car apparently sets off in 1st (maybe 2nd?), but as he accelerates away and the box changes up the revs don't climb steadily as you would expect, they fluctuate up and down a little depending on throttle opening. Once the box has warmed up it behaves normally it seems. I've read one or two posts about this somewhere else which imply that it could be the TC taking a while to lock up. He's concerned that this could be the box giving notice to quit. Any thoughts folks?
 

Edited by pidgeonpost

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Warmup program activated below 30 degrees C, when it's active it doesn't lock the torque convertor. As soon as the box reaches 30c it returns to normal so usually in this weather takes 2-5 mins.

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^That wouldn't give the symptoms of a rev fluctuation, non engagement if the TC lock up just holds the revs higher until its warm.  The lack of TC lock up when engine was cold in my E60 was quite noticeable as the change point between low gears was noticeably higher in the rev range. 

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On 28/11/2018 at 08:39, GoNz0 said:

Warmup program activated below 30 degrees C, when it's active it doesn't lock the torque convertor. As soon as the box reaches 30c it returns to normal so usually in this weather takes 2-5 mins.

 

I thought it was this also but as Andrew says revs wouldnt fluctuate. I think best get codes read and ATF level checked

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Quote

fluctuate up and down a little depending on throttle opening

This is what made me think it was the warm up program rather than a knackered TC

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Quite possibly just normal warm-up procedure. The ECU etc tries to keep the revs higher so that the engine warms up faster, so the car does behave differently in the first few minutes from cold. Low or old fluid may not be helping, and there will be wear and tear as well.

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