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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Idle drop on startup?
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      06-06-2022, 12:58 AM   #1
F10Timmy
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Idle drop on startup?

Hello, I have a 2012 535xi and I'm experiencing an idle drop on startup. Car will first start up around 600 rpm for a second then jumps to around 1100 rpm then slowly idles down normally back to 600 rmp. Any suggestions? I'm fairly new to the n55 platform so I'm unsure if this is a common issue or not. Thanks
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      06-06-2022, 10:13 AM   #2
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That sounds like normal cold start behavior. It should only do this when the car is cold
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      06-26-2022, 03:26 PM   #3
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Quote:
Originally Posted by Unspec View Post
That sounds like normal cold start behavior. It should only do this when the car is cold
^This^

On cold starts, my N55 motor will rev up to ~1100 rpm then settle down to 600 rpm within about a minute or so.

I have never seen it go from 600-to-1100-to-600 though.
On very rare occasions it has briefly bumped up to ~1800 rpm for a couple moments before settling back down to 1100 rpm.
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