Noise on idle e90 320i

the e90 has 30k miles on it and is an auto.

There is a faint noise on idle (disappears when driving) that can only be heard if you turn the radio off and listen for it,

It's a little shudder / rattle that sounds like it's coming from the upper left hand side of the engine bay. It's also not constant there's a 1-2 second gap between each sound.

Revs do not change and idle perfectly, car drives perfectly also.

Is there some kind of pump in that area that could be getting noisy at that mileage? Or is it more likely that it's just something loose hitting off something? Engine mounts also spring to Mind but on 30k they couldn't be gone?

No warning lights, service due light is on since I bought it (5 days ago) and it's been booked in for Saturday week since the day I bought it.

Anyone ever had this before?

Is your fan on?


Regards,

Andy

Yes it would probably be in time with the fan as if you start from dead cold it takes about 30secs for the noise to start happening - but I didn't think you'd hear that through the firewall? Sounds very close to the firewall from inside the cabin

Turn off the air fan and see if it disappears. If so that's your culprit, they can get noisy and squeaky and can be heard from the cabin. Easy fix if it is.




Regards,

Andy

Oh you mean the air fan for the cabin? No it stays when that is off sorry, I thought you meant the radiator fan

It's hardly the a/c ventilation motors in the dash? In the E46 they are quiet but in later cars I've driven such as my wife's passat them can sound a bit odd and constantly making little adjustments.

No it's definetly engine bay, you can hear it with the hood up aswell - I'll try and get a video done later on might clear things up

Hardly a timing chain problem at such low mileage? Saying that though, a family members 07 320i
with 45k miles needed the chain replaced

Better not be haha - timing chain wouldn't be a spaced out noise though would it? Would be continuous and remain while driving?

This describes it perfectly so fingers crossed this is the culprit

http://tapatalk.imageshack.com/v2/14...be44e32044.jpg

Gas sometimes the simplest things, I must check mine later. Have you got it sorted now?

Nope still in the office, up with Conor this evening for a service though so will inspect then [emoji6]

Ok so on inspection by Conor last night it looks like the air con pump is the culprit.

I can live with that [emoji1]

Quote:

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Originally Posted by Dillon

Ok so on inspection by Conor last night it looks like the air con pump is the culprit.

I can live with that [emoji1]

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Could be worse, I'm sure you would pick one up cheap enough in a breaker, a regas and your sorted.

Yup, would you go second hand on one or just pick up a new one and be done with it.

It's mad that it's only noisy when the AC is off

Price of a new one would be a face melter. I would definitely go second hand.

Yeah I'd say your right, imagine getting a new one and it didn't fix the problem haha - I'd need a rope and a chair