BMW 116i Running rough - Please Help

[Solvedduck]

Can someone please shed a light on this issue. I have a bmw 116i, after it driving beautifully on a 600 mile round trip I started it and there's a horrible top end knocking. I have a video but don't know how to upload it . any suggestions on the issue would be appreciated
forgot to add it gets quieter when reved but as soon as you let off it returns

[Thats What She Said]

You would probably be better off getting a mechanic to look at it. Anything else is just guesswork.

[Solvedduck]

is there any way to upload a video?

[Lowtimer]

post in on YouTube and put the link to it on here

[GreenV8S]

Solvedduck said:

horrible top end knocking

If it's a mechanical failure (failed bearing, rocker, follower etc) then you risk causing more widespread damage quite quickly if you continue running it. I'd suggest you get it recovered to a reliable local garage for diagnosis.

[Solvedduck]

This is the link. https://youtu.be/h-fb3tqRhiU

[stevieturbo]

diesel knock...maybe an iffy injector or something.

Dodgy fuel ? wrong fuel ? put petrol in it ?

[Solvedduck]

It’s a petrol not valvetronic and has cam chain

[Mignon]

Sounds a bit like an exhaust manifold blow but could also be a tappet not working.

[GreenV8S]

The video makes it sound like an intermittent tapping. Is that how it sounds irl?

[stevieturbo]

Sounds like a diesel !! lol

Probably direct injection ? Could still be an injector issue.

Fault codes ?

[helix402]

Maybe stretched timing chain hitting cam cover.

[Solvedduck]

So I went to start the car yesterday and there was hardly any noise! There’s still something no quite right but I’m baffled

[Mignon]

Could be an intermittent oil pressure issue stopping a tappet pumping up properly at idle. Blocked oil pickup pipe in the sump is a possibility. Does it have an oil pressure gauge?

[Butter Face]

Sounds like the chain to me. My wife had one and the tensioner had all but failed, a new tensioner did the job and didn't cost a lot either.

https://www.ebay.co.uk/itm/TIMING-CHAIN-TENSIONER-...

They are sprung and work on oil pressure also.

[Mignon]

Because the noise goes when you rev it rather than get worse it does seem oil pressure related. How many miles has it done?

[Solvedduck]

Unfortunately everything is sensor based and electric :/ had a few people suggest it could be the Vanos unit