F10 m5 rough idle on cold starts

[Molotov1903]

Hi there guys, I was wondering if anybody else is having this issue during cold starts, the engine starts and the revs jump up to around 1500 rpm. However during the cold start and for a little while after the revs jump up and down 50-100 rpm until you drive off and get some heat in the engine...

Any suggestions for what might me causing these rev fluctuations? And how to deal with it.. thanks..

[M5_Raz]

I wrote a guide on how to fix it by cleaning maf sensors. Check it out and see if it helps

[BMWSauberF1]

Cou can even try to unplug the MAF’s temporarily they’re the ones on the intake tubes coming from the airbox just to see if that makes that uneven idle go away then obviously plug them back in after. But as raz said it’s prob just dirty MAF’s they’re easy to pull and then spray with MAF cleaner.

[Molotov1903]

Originally Posted by M5_Raz

I wrote a guide on how to fix it by cleaning maf sensors. Check it out and see if it helps

It qas the MAF thanks dude ...

[M5_Raz]

Originally Posted by Molotov1903

It qas the MAF thanks dude ...

Yeah, that’s filthy!

[Molotov1903]

Originally Posted by M5_Raz

Yeah, that’s filthy!

Had the dealer recently chage out all bank 1 plugs fuel rail and high pressure pump and after they gave it back this happened... just goes to show how much care and attention these so called techs have these days...

But yeah shes running smoooooth now after a good spray off...

👍👍💯💯🙋*♂️