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E39 M5 (1998-2003)

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  #1  
Old 01-20-2014, 10:46 AM
spikedit@140 spikedit@140 is offline
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Location: oregon
 
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Mein Auto: 2002 m5
Help please

First BMW love it like it was my kid but changing from classic hot rods to a BMW is mind blowing i haven't a clue as to what to do hear is my problem my m5 runs great then all of a sudden looses power and starts missing and wont shift tell it reeves to about 6000 rpm any ideas
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  #2  
Old 01-21-2014, 10:25 AM
mark_m5's Avatar
mark_m5 mark_m5 is offline
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Mein Auto: 2002 M5, 1999 M Roadster
Quote:
Originally Posted by spikedit@140 View Post
First BMW. Love it like it was my kid - but changing from classic hot rods to a BMW is mind blowing. I haven't a clue as to what to do. hear (Here) is my problem: my M5 runs great, then all of a sudden looses (loses) power and starts missing and wont (won't) shift tell (until) it reeves (revs) to about 6000 rpm. Any ideas?
Grammar and spelling corrections, no charge.

The E39 M5 doesn't have an automatic transmission, so there's no such thing as "won't shift". You control the shift.

If loss of power was happening in an M5, you'd see a "Service Engine Soon" light come up on the dash. You can use a regular OBD2 reader or Peak tool to check the code and see if it's an O2 sensor, VANOS, or some other thing. If you have no SES light, then maybe it was disconnected or the bulb burned out.

I recommend taking the car to a qualified mechanic to have them diagnose the issue.
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