06 Mini Cooper S - reving while driving - BMW Forum

paco1076 · 02-28-2011, 11:26 AM

Hey guys;

Here's a strange one for you. My wife's 06 Mini Cooper S, automatic trans, 75,000 miles, randomly revs up while driving. I would have called her nuts, but it happened to me the other day. Only happens when the car is warmed up and you are running about 35 mph. Steady throttle pedal pressure. Suddenly the engine revs up about 1500 RPM without accelerating the vehicle at all, then "CLUNK" the transmission re-engages and the car lurches forward...

Any ideas? The Minis are supposed to have lifetime fluid in the trans. I have checked around for vaccuum leaks, etc, but can't find anything obvious.

Thanks,
Paco

rgc0233 · 02-28-2011, 12:31 PM

Sounds like the transmission is slipping. Check the fluid level. I believe the thinking has changed on the lifetime fill. It would be a good time to change the fluid & filter.

rgc0233 · 03-01-2011, 12:40 PM

I love mine. It is a lot of fun. If you are a DIY'er they aren't too hard to work on and I haven't had any real problems with it. Most of my work has been improving performance and there are a lot of parts available for that.

paco1076 · 03-01-2011, 12:56 PM

I agree with RGC. This is the first non-maintenance related issue I have had. Easy to work on for the most part. The engine bay is a little tight, so if you have big hands be ready to get a little torn up. Make sure you get the service manual, it has been a huge help.
Its great to drive. Very fast, handles well, good fuel economy. Although have one of the last super charged S models. They went to a turbo in 2007, so I don't know how those are doing.

paco1076 · 05-12-2011, 12:33 PM

Ok, so I changed the transmission fluid with some Mobile 1 full synthetic stuff and that seems to have really helped. Going to do it again in a week or so to make sure I got as much of the old fluid out as possible.

I found some instructions online for the Aisin 6 sp automatic and followed those. Even though these are for the trans that is in a VW the transmissions are the same.

Take a look;
VW Automatic Transmission Fluid - How To Change VW Transmission Fluid

Good luck.

P