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What’s up guys just recently bought a e60 m5 and on start the idle is a little ruff jumps from 800-1000rpm for about 5 min then clears up. I’m not getting any lights on the dash nor error messages on the idrive. Does any of this sound familiar to anyone ? Thanks in advance
 

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What’s up guys just recently bought a e60 m5 and on start the idle is a little ruff jumps from 800-1000rpm for about 5 min then clears up. I’m not getting any lights on the dash nor error messages on the idrive. Does any of this sound familiar to anyone ? Thanks in advance
Yes, I had the same thing. Changed out the Voltage Regulator because when I read the voltage in the secret menu, it seemed to follow the rev hunting that was happening. So a $40 part fixed it for me.

Basically, the voltage regulator goes bad, starts rising and dropping volts, and the idle controller tries to keep it at a steady voltage and chases it around. Stupid thing. But glad it wasn't the whole alternator!
 
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