E90 320i Engine Knock at Idle
Discussion
https://www.youtube.com/watch?v=ZcJPwgXfCP0
Hi all. I have an engine knock at idle on my 2008 BMW 320i E92 Coupe.
It first happened a few weeks ago but went away that evening as well. Haven't heard it since but its done it twice now recently, when the engine is hot and only at idle. If you rev it goes away. It seems to be coming from (see video link) whatever the item is next to the engine block, just to the right there (I am no mechanic!).
Car drives fine, no loss of power, no difference in economy, oil OK and on proper fully synthetic oil (Castrol) as recommended, had all new injectors etc only a few months ago and was fine until this. No difference in drive or performance as I say but a horrid knocking sound at idle when it feels like doing it. Don't know if its the item to the RH side of the engine block or the alternator below.
Any ideas at all guys? Thanks in advance. I don't see what it can really be with no difference in performance or anything else and only does it at idle...no difference in noise or knocking at all at revs...it goes away?? :S
Hi all. I have an engine knock at idle on my 2008 BMW 320i E92 Coupe.
It first happened a few weeks ago but went away that evening as well. Haven't heard it since but its done it twice now recently, when the engine is hot and only at idle. If you rev it goes away. It seems to be coming from (see video link) whatever the item is next to the engine block, just to the right there (I am no mechanic!).
Car drives fine, no loss of power, no difference in economy, oil OK and on proper fully synthetic oil (Castrol) as recommended, had all new injectors etc only a few months ago and was fine until this. No difference in drive or performance as I say but a horrid knocking sound at idle when it feels like doing it. Don't know if its the item to the RH side of the engine block or the alternator below.
Any ideas at all guys? Thanks in advance. I don't see what it can really be with no difference in performance or anything else and only does it at idle...no difference in noise or knocking at all at revs...it goes away?? :S
ZX10R NIN said:
Are you sure it's not the air con pump this would give a similar sound to bottom end knock, the easy way to find out is to remove the belt & see if the noise has gone.
Hi mate - thanks for that. Where abouts is the air con pump and would that run without the aircon being switched on?Surely if it was the chain though it would do it constantly? Took that video that other night and the car hasn't done it since. As I say it doesn't do it cold, it doesn't do it very often, it just does it now and again, hence me filming it at night while I had the chance. Surely if its the chain and its about to go it will never stop doing it until it goes?
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