wot engine?

 

its an N42 as far as im aware.

 

speaker are shit on my laptop describe the noise and how long it lasts?

 

Ok, so its just a rough rattling sound that drops in pitch and gets really loud when the car is put into gear. Once revs are applied it seems to go away and wont do it badly again until the car has been sitting for a good 4 or 5 hours. I get a slight bumps in idle after warmed up.

ive got 140000km on it

Checking under the hood I cant seem to narrow down where its coming from.

Almost sounds like something loose to me like part of the exhaust but I showed the video to a mechanic friend (who dosent do beemers) and he decided it wasnt likely to be that.

 

im gonna take a guess thats its valvetronic related as when you come off idle the valvetronic kicks in its quite notorious for the valvetronic gear wearing and rattling...


i would suggest an oil change and engine flush as part of what you have said could relate to oil pressure...


these engines are notorious for valvetronic and timing chain rattle and wear so a new timing chain tensioner is deffo worth changing for what they cost and to eliminate it....


does it stop as the engine warms up or more quickly when oil pressure has built up?? daft question but have you dipped the oil???

 

I had a full service just a couple of weeks ago so oil is good. I guess timing chain rattle could be a likely candidate

 

is it a clatter or a rattle?

 

man its really hard to say, sounds like the engines being bogged down like trying to drive off slowly in a manual with the brakes all on just before it stalls

 

https://www.youtube.com/watch?v=9vKqc29wOHg



This is quite similer could be it i think

 

itsa tough one on a forum to be honest but rule of thumb if it goes within a minute its prolly oil and summat reliant on oil pressure thats worn like hydraulic lifters, if it lingers more while it warming up its prolly worn or failing related and not reliant on oil as much...


but i do know valvetronic can make terrible clattering noises (and rough running) and timing chain terrible rattling noises on these engines...


stuff on the front and external to the engine like pulleys and alt bearings etc etc it would do it all the time...

worth checking if its got an air pump too if it lasts for around 2 minutes on cold starts...

 

Hey what do you mean by the valvetronic?

 

Ok guys

Well problem remains. I have just got around to changing the cam chain tensioner which hasnt helped. I have also ruled out the serpinetine belt tensioner.

When we had the plastics off (should have taken a video i know) we narrowed the loud ticking noise down to be right down to the injectors and inlet manifold join somewhere. Mate reckons it could be the IM gasket.

I will note that this loud ticking is always present, it does still get really loud in gear in the mornings like video and I have to think its related.

 

Hi - Does the car hesitate to start and cut out whilst driving normally? Could be a sign the timing chain is about to snap! same thing happened to mine and that was only a 2009 model

 

Hi, No performance is still fine. I suspected the timing chain but after installing the new tensioner and having a close look the sound is coming from around the injectors

 

So....

I have replaced the cam chain tensioner as I had a tick aswell but that didnt help. Here is a video under the bonnet. The sound seems to be coming from around the airbox or belt.

https://youtu.be/XDNvTmjkDHI