[Hozmoz]

Hey, I have a 2011 535i Xdrive with about 90k miles on it. whenever I cold start the car, the engine knocks. Once the car is warmed up it completely goes away. This has been going on for a little less than a year now and it's driving me crazy. Recently I have noticed that sometimes comes back at idle.

i attached a video of the sound on a cold start. Please let me know if you all have any tips for me.

https://share.icloud.com/photos/095D...sjCHXNcl55rIcA

[Conserve]

I did not see attachment. Did you see this?

https://f10.5post.com/forums/showthr...20filler%20cap.

[Surly73]

Originally Posted by Conserve

I did not see attachment. Did you see this?

https://f10.5post.com/forums/showthr...20filler%20cap.

Mine has been doing ^^^ this ^^^ for many years. Scared the crap out of me the first time I pulled the oil fill cap and heard it. It sounded like a squeaky belt pulley so I was chasing it while under original factory warranty (which tells you how long ago this was on a 2011).

[Hozmoz]

Hi, thanks for responding I just added a link, let me know if its still not working

[JimThot]

sounds like one of ur rod bearings might be starting to go. My car had the same noise but much louder and when i dropped the oil pan i found out the oil pickup tube was broken off and was sitting in the pan along with my cylinder 6 bearing completely toast. so basically my car starved itself of oil lol

[wesamjaber2004@gmail.com]

Sounds normal to me idk 🤷🏽‍♂️

[ChiltiCoatl89]

Originally Posted by Hozmoz

Hey, I have a 2011 535i Xdrive with about 90k miles on it. whenever I cold start the car, the engine knocks. Once the car is warmed up it completely goes away. This has been going on for a little less than a year now and it's driving me crazy. Recently I have noticed that sometimes comes back at idle.

i attached a video of the sound on a cold start. Please let me know if you all have any tips for me.

https://share.icloud.com/photos/095D...sjCHXNcl55rIcA

Anyway you can post the noise you are experiencing on youtube?

[Hozmoz]

i don't think its rod bearings because the sound completely goes away when the car warms up, I talked to a mechanic and he said it might be lifters

[ChiltiCoatl89]

If only on Cold start, Check your Vanos Solenoids and inspect or clean them, or replace as needed, they tend to be noisy on Cold start up until warm.

[wesamjaber2004@gmail.com]

Originally Posted by ChiltiCoatl89

If only on Cold start, Check your Vanos Solenoids and inspect or clean them, or replace as needed, they tend to be noisy on Cold start up until warm.

This is exactly what I did and my cold start knock went away. I did this months ago just as preventative maintenance a few months ago and my car felt smoother as well as the knock noise going away on cold start. Funny thing is I wasn’t even trying to fix the knock lol. So I guess the fix found it’s way to me. But yeah definitely try the Vanos and clean both solenoids.

[John H.]

I change my oil every 5k, and I always add this...