[powerrrwiththreeRs]

First post, long time reader! I searched this quite a bit so hopefully I'm not adding to the noise.

I have a 2014 435i xDrive 6MT that I have owned about a month (came from an F30 328i). Really love this car.

I noticed recently that on cold starts, my car will fire normally, then immediately after cranking the revs will settle around normal *warm* idle speed. About a second later they will jump to 1250 or so (around where you'd expect a cold idle to be). I don't feel a stumble in between right now, though the idle speed does fluctuate for a few seconds after the revs increase.

Car runs beautifully all other times (pulls like a sumbitch, too), I guess I just want to make sure this isn't the early signs of a fuel issue. I believe this one is the N55, not the 54 so I'd assume those issues don't apply or at least not to the same degree....

Thanks in advance

[aL_bmwf30]

It only does it when warming up right? Or do the rpms change when fully warmed up, when car is on and idle??

[powerrrwiththreeRs]

Originally Posted by aL_bmwf30

It only does it when warming up right? Or do the rpms change when fully warmed up, when car is on and idle??

Only right after a dead cold start. Once its even a little warm the idle is glass smooth.

[aL_bmwf30]

To be honest I dont think its anything serious, and I dont think its a fuel issue, because if it was a fuel issue the car would barley run or the engine would die, my cars rpms change like that sometimes too, I have a 2013 Bmw 328i xdrive luxury line, bottom line cold cars do strange things sometimes..