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#1 (permalink) Old 01-17-2012, 01:36 AM
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BMW E39 525i

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
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#2 (permalink) Old 01-21-2012, 04:03 PM
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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
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#3 (permalink) Old 01-22-2012, 01:59 AM
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thank you

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
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#4 (permalink) Old 01-23-2012, 09:01 PM
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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
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#5 (permalink) Old 01-24-2012, 01:40 AM
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hello,

thank you , tomorrow is the big day I going to the dealer for the diagnostics after I post all the codes . thank you
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#6 (permalink) Old 01-24-2012, 10:40 AM
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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).
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