[EastCoast335i]

Noticed this for the first time today (3400 miles on car 10/07 build)
I normally idle at 600rpms but i noticed for the first time today after idling for about 4-5mins (fully warmed up, 240 temp) suddenly the rpms jump to 800 and after about 1 second came down to 700 and then after another second came back down to 600. This occured about 3 times in a row.
I then stepped on the accelerator for a brief second and the idles spikes went away.

I did a search and noticed quite a few ppl have an erratic idle but no of the threads offered a difinitive anwser to the issue.

[Artz 330]

Originally Posted by EastCoast335i

Noticed this for the first time today (3400 miles on car 10/07 build)
I normally idle at 600rpms but i noticed for the first time today after idling for about 4-5mins (fully warmed up, 240 temp) suddenly the rpms jump to 800 and after about 1 second came down to 700 and then after another second came back down to 600. This occured about 3 times in a row.
I then stepped on the accelerator for a brief second and the idles spikes went away.

I did a search and noticed quite a few ppl have an erratic idle but no of the threads offered a difinitive anwser to the issue.

normal, had this on all my BMW's my Z4M does it more than my 335i. The M will go between 600-1000 it has done this since day one. Dealer says its normal and I now have 63,000 Miles on the car [Yes your reading it right 63,000]

[EastCoast335i]

Originally Posted by Artz 330

normal, had this on all my BMW's my Z4M does it more than my 335i. The M will go between 600-1000 it has done this since day one. Dealer says its normal and I now have 63,000 Miles on the car [Yes your reading it right 63,000]

Thanks for the info Artz
Not too worried if it is the intial signs of a problem, since its still under warranty.

[wj4]

Normal like stated. It's been doing it on my car since very early on. Still doing it now at about 22,000 miles. I notice it on longer stops.

[MrWorf]

Could just be the AC kicking in and thus putting more load on the engine (yes, even 300hp engines will feel the drain of AC ;-))

[wuufer001]

mine does that sometimes too, thought had something to do with my exhaust. well it sounds like its normal now and still under warranty.

[EastCoast335i]

Originally Posted by MrWorf

Could just be the AC kicking in and thus putting more load on the engine (yes, even 300hp engines will feel the drain of AC ;-))

Nah AC was not on. It was a cool 60F yesterday when this idle twitch occured.

[wj4]

Originally Posted by MrWorf

Could just be the AC kicking in and thus putting more load on the engine (yes, even 300hp engines will feel the drain of AC ;-))

When the AC is on, it idles at about 700 RPM. This event the OP is describing is 100 RPM higher.