[2funky4u]

Morning All.. Started the 335i this morning and noticed a rattling sound coming from the engine on start-up. Note the start-up was from cold. Wasn't sure if this is normal or whether it points to something like the wastegate rattle issue ?

Would appreciate some advice.

The first Video (hopefully the link works!) - is when I started the car from cold and instantly took the video.

Video 1

The second video is when I pulled it out of the garage after about 3 mins or so, still idling.

Video 2

[Mitch.]

Is the noise in the second video coming from the passenger side?

If so, I believe it is a fuel venting solenoid, (not sure on the exact name) and is a common problem on the N54. It is located somewhere under the inlet manifold. There are a lot of videos on YouTube of the same noise.

I also have this noise occasionally, sometimes it does it, sometimes not.

Many people say it's a noisy injector, but the injectors are on the other side (off side) of the engine.

[djgandy]

That second video sounds like a rapid firing gas hob igniter!

Mine had weird noises when I got it, seems to depend on temperature, day of the month, what I had for breakfast.

Keep an eye on it, if it doesn't go away when the weather warms up, maybe sometime in September at this rate then i'd be a bit more worried.

[phil200tdi]

Normal - Injectors make a clicking noise at idle, second video is showing the fuel pump.

If the car runs fine and is hitting boost targets then there isnt a problem. Dont go looking for a problem which doesn't exist!