Hi All, just acquired a 7/2000 735i with 5 speed Steptronic trans, 170,000 km on the clock. It seems to have trouble staying in 5th gear at cruising speed, sometimes for no apparent reason throws itself back to 3rd when in auto, but even pushing the shift lever to M and forcing it to shift up, it won't stay in 5th. At low speeds (50-60 km/h) there is a slight rattling noise and you can feel the gears shunting up and down constantly. Sounds expensive to me, any clues out there?
We assume you already checked your fluid level or even better, changed your fluid and filter and in your oil pan you don't saw any particle or had a heavenly burnt oil smell.
First check your computer and scan for failure codes .
The codes will indicate where the problem is located and what can be dun to solve it.
You just get the car and you can have codes in the transmission because the owner before maybe never cleared any of them. The best ding for you to do is, clear all codes,
reset the adaptation and perform a new adaptation and after all of this drive your car and see how it performs.
If you have problems read the codes again and then you know for sure where your problem is
Well, it was a full $4500 rebuild. The torque converter lock-up clutch was shot, the oil was black and full of metal ..... all 3 clutch packs were replaced while it was apart anyway, full valve body clean and new o-rings. Hopefully good for another 150,000 km now ...
