Engine rev while in neutral

[wolfie]

Okay here is a oddity that I would appreciate some feedback on.

Whenever I am coasting to a redlight while I neutral (manual tran) the engine will blip the rpms from 800 rpms to about 1,050 every second or so until I reach standstill. This does not happen if I coast (foot off gas) in any gear but only if I am in neutral.

Please try and let me know if this is normal (and if so why) or whether I have an engine management issue that requires attention.

2009 R8 1,600 miles

[ky_soldier]

mine does same thing - i was also curious

[wolfie]

Ky soldier, both your 08 and 09 or just the 09?

[ky_soldier]

just the 2009

[wolfie]

A friend of mine who also has an 09 told me that his does not do this. He refers to it as "hunting" in idle. Oddly this only happens when I am coasting in neutral not when I am at a standstill.

ANYONE else care to weigh in?

[wedouglas]

Manual 08 here. Tried last night at about 35 mph. Just coasted at 800.

[MikeB]

Have you tried it without aircon on?

[wolfie]

No, but I will try that and see.

[bromers]

Aircon is normally the culprit, but you shouldn't be coasting in neutral, harder on the brakes - let the engine do the braking too.

[kthacher]

I have a 2009 and tried coasting with the clutch depressed - both in gear and in neutral. My RPM stays steady at slightly over 800 in both cases. I have AC on, but it may not be doing much since it is not that warm here now.