Ruff idle at start - BMW M5 Forum and M6 Forums
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post #1 of 3 Old 4th July 2019, 01:07 AM Thread Starter
Daphatch
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Ruff idle at start

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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post #2 of 3 Old 4th July 2019, 04:33 AM
Jetpilot718
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Originally Posted by Daphatch View Post
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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post #3 of 3 Old 5th July 2019, 01:49 AM
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