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Old 08-23-2014, 12:04 PM
autoque autoque is offline
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Join Date: May 2008
Location: Canada
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Exclamation Advice needed on rough start/idling

I've got a '08 N52 3.0 naturally aspirated motor. At every warm start, the engine runs rough for like 1 to 2 minutes. It almost disappears after about 2 minutes but a sensitive person can still feel some unevenness in idle whenever I'm stopped.
But when I unplug the eccentric shaft sensor, the symptom doesn't show up anymore. From what I've researched, unplugging the eccentric shaft sensor disables valvetronic and the valve lift is set to maximum at idle.
I've also heard, for N52 engines, the valve lift can't be adjusted as it's automatic.
So which parts of valvetronic should I replace to fix this issue? Yeah, I'm throwing parts at it but I think I'm this close to finding out the root of this problem. BTW, no codes.
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