BMW E39 525i

[usexpert]

I bought a BMW, E39, 525I from 2003 wirh automatic transmission and I have a big problem with it. While running, when reachs the speed of 45-50miles/h, the rpm indicator start to waver between 1500-1800rpm, 1700-2200rpm…2000-1500 and so on. It goes up and down till it reach the speed of 55miles/, after that everything goes fine. In the moment that the rpm indicator start to oscillate, you can also feel some vibes and a “woove” sound…This happens just when the car is in D mode. If you put it in Sport mode or steptronic, nothig happens and it runns perfectly.
I really need an advise….Can you help me, please? Thank you

[westin]

check engine light on ?if yes what codes,does the car feel like its rpm are actualy jumping like that or just the gauge jumping up and down

[usexpert]

hello, no engine light. I scan the car with snap-on :227-O2 bank 1 control deviation,239-miss fire 2, 228 O2 bank 2...., 238-miss fire 1,82-rotation rate sensor circuit,F5-can data error from DME/DDE, and yes I feel the engine go up and down not just the rpm. thank you

[westin]

Wouldnt wory to much about o2 sensor codes but that funky rotation sensor sensorand that can error sound serious i dodnt now much about the codes ,ill find out what i can ill get back to you

[usexpert]

thank you , tomorrow is the big day I going to the dealer for the diagnostics after I post all the codes . thank you

[rivroshaun951]

I am not a professional. This is just my opinion. I could be wrong.

To me it sounds like you have a slipping clutch pack. Or possibly a TCC (tourque converter clutch) slipping.

I would guess your overdrive clutch pack is slipping since it is only affecting 4th gear. Check your tranny fluid level and perform a stall test. During the stall test put the car in neutral to see if the sound stops a (this will tell you if it's the trans pump or not).