Engine Sound on Cold-Start

[DylanMPerformance]

Any ideas what this sound is?

I'm thinking its the tensioner chain but can't find good videos to compare it to.
Got ACL bearings...don't think it's rod knock.

[///M Power-Belgium]

Originally Posted by DylanMPerformance

Any ideas what this sound is?

I'm thinking its the tensioner chain but can't find good videos to compare it to.
Got ACL bearings...don't think it's rod knock.

Mate . That isn't rod knock .
You are having the softer version from this => https://www.m3post.com/forums/showth...ight=LIMITLESS

You're just fine !

[Ajolives]

I've had the same issue for about a year - read the same posts and saw no one came up with a solid answer in almost 8 years, so I'm tabling it for now, leaning towards Vanos but that's just a guess. I'm not overly worried about it.

[///M Power-Belgium]

Originally Posted by Ajolives

I've had the same issue for about a year - read the same posts and saw no one came up with a solid answer in almost 8 years, so I'm tabling it for now, leaning towards Vanos but that's just a guess. I'm not overly worried about it.

It isn't a guess . There was "one" Puma case regarding the S65 Vanos-Gears .

[djsilverjohnson]

Originally Posted by ///M Power-Belgium

It isn't a guess . There was "one" Puma case regarding the S65 Vanos-Gears .

Interesting, but too bad we can't see the rest of the report to see where it ended.

We've had a 2013 E93 M3 for almost 1-1/2 years and I can say the cold idle is a bit wonky/lumpy for about the same amount of time that it takes my Dodge truck to go from open loop to closed loop on cold start. My truck does it smoother but it kicks the idle higher on cold starts to cover up it's confusion! ;-) I figure it's a tradeoff for owning such an amazing BMW (break my wallet) car....,

[Ajolives]

VANOS gears it is! Why not, can't be too bad, haha - couldn't hurt at 150k miles. Thanks for sharing that, it is a shame the tech couldn't document if that fixed the noise.