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Old 01-19-2012, 02:34 PM
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Location: Phoenix West Valley
Join Date: Jul 2011
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Mein Auto: 2011 E93 335i
Originally Posted by thekurgan View Post
What I noticed with both vehicles was the idle was not smooth, it was "lopey" and I wondered if this was the norm for the N55 or if maybe since we've recently read some idle issues with the N52, is it valvetronic causing the idle issues?
That happens occasionally on ours when just started and the ambient temp is on the cold side (I'd say below 20 F), but it's very mild and my wife doesn't even notice it.

I've been wondering if it's not due to the wastegate oscillating to compensate for the turbo doing so while warming up and creating a minor positive feedback loop, but the valvetronic could easily be the issue too. Either way, I'd think it would be a simple fix via a DME update.

Or it could be something else entirely that will become the HPFP issue for the N55.
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