30i Engine Vibration at Idle

[imalabil]

I just don't know what to expect from a 2009 E70 30i - it isn't glass-smooth at idle in drive, there's some buzzing or light vibration felt in the body structure and steering wheel. It's a lot less noticeable when put into neutral, and goes away once the throttle is tipped in and you accelerate. Not harsh, random vibration like a miss, but more of a buzzing sensation. Sometimes some underhood panels set up a sympathetic resonance as well.

If some of you owners could comment, it would be appreciated.

[jcannizzo]

I am currently experiencing the same vibration, and occasionally experience a very rough idle for a moment or two, when placed in gear the X5 actually lunges forward

[bmrboi2]

Same Thing on mine. Was gonna start with plugs..&..running some injector cleaner through it.

[rh71]

Same here on an '08. Mostly in the dash of course and most noticeable when I pull up to the first light leaving home. I'll have to take care to notice if it's just when the engine is cold.

No rough idle or lurches here.

[imalabil]

Good point about injector cleaner. Being a used car I have no idea if this was ever done.
On all my other vehicles for years I have used the appropirate amount of Chevron FI or fuel system cleaner every 10K miles.

[bmrboi2]

Well that seemed to do it plus running some Shell gas certainly helped as well...Granted I only got 200 miles out of that tank of gas but everything seemed to improve dramatically. Gas mileage has resumed to its usual 25-28 HWY and the engine is as smooth as silk.

[ard]

When you hook up a BMW computer and look at valve timing, air/fuel adaptations, ignition advance, etc, etc, what do you see??

Otherwise it is like superstitious natives sacrificing virgins. IMO

[rh71]

Originally Posted by bmrboi2

Well that seemed to do it plus running some Shell gas certainly helped as well...Granted I only got 200 miles out of that tank of gas but everything seemed to improve dramatically. Gas mileage has resumed to its usual 25-28 HWY and the engine is as smooth as silk.

I've used Techron a few times including right before my last oil change (used that tank of gas then did the change) in January and I still have the idle vibration. No big difference in engine performance either.

Also wanted to clarify, it happens even when the engine is warm.

[bmrboi2]

My husband actually commented on how the rough idle disappeared after a $15 can of fuel injector cleaner and a $35 fill up of shell 94 octane. Rough idle gone today.

[imalabil]

I just drove 2 other 30i vehicles and they do the same thing. I guess that is the way they are.