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      11-21-2011, 11:12 AM   #1
nik_uk
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E90 - 320i - Auto - Noise

Hi Forum - I am scratching my hair out trying to locate a noise. I am hoping that someone has had a similar experience or pointers they can share.

Here goes.....When the car is Cold and i start her up she sounds fine. BUT as soon I engage her in 'R' or 'D' (AUTO) I start hearing a real loud GRUMBLE. - this goes away as soon as I drive away, and disappears when warm!

I have had it plugged into DIS and NO Fault Codes (initially i thought it was Transmission) but then again it still could be ( I suspected the Torque Converter). - however if it was the TC, then apparently i would hear a squealing sound when revved - (There is no such noise) - maybe wrong

As winter is setting here in the UK - i want to get this resolved

any thoughts...friends???
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      11-25-2011, 07:03 AM   #2
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I am surprised that this is fro all things E90, and that 38 people have viewed it - BUT no one has a suggestion!

Appreciate it may be something that no-one has come across - but some guidance would have been great - after all this is a forum - Or I may have missed the objective!
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      11-25-2011, 07:12 AM   #3
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Have you had a poke around underneath the car?

Where does the grumble come from? Front or rear?

Mileage on the car?
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      11-25-2011, 07:25 AM   #4
nik_uk
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Yup - It is coming from the Front - BUT this statement may sound weird - It seems to be coming from ALL Over, by that I mean it could be resonating - the car has 58K and is an Auto.

Note it clears when revving/accelerating and when warm and only happens when in D or R for the first 5 mins

Initially thought it was alternator when charging and it still could be - but I am not that 'technically' minded.
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      11-25-2011, 07:51 AM   #5
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Have got a friend handy? get them to make the noise while you stand outside tbh.
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      11-25-2011, 08:01 AM   #6
HighlandPete
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The sort of vibration you appear to be desribing does sound like its being generated from an 'unbalanced' rotating source. Gearbox initiated, R or D, would indicate that the 'box/TC is involved.

Wonder if you are getting partial drain out from the TC, used to be quite common on some 5-speed autos *.

Do you have a slight delay when you go to pull off? Different from a normal warm start, where it should instantly give positive drive.

A check to see if it is alternator induced, (once the revs change as you engage R or D), just load the alternator with lights and rear screen, to see if that changes the sound track, while still in park.

* I've had my 330d give a vibration from my gearbox/TC, on several occasions, after not using the car a couple of days. Occurs when D is engaged, slow to pick up drive, by normal standards, but it disappears in a second or so. I've suspected that is a bit of TC drain back.

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      11-28-2011, 03:29 PM   #7
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Hi
This is strange, my Dad's E91 320i has the exact same issue that just started a couple of weeks ago.
It sounds to me like some sort of pump issue but as you say it seems to disappear when it gets hot. I did loads of searching around on the net but everyone says the Auto fluid is sealed but his has a resiviour with a dipstick in it (bit no high and low marks). I would also be really interested if anyone else has these issues.
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      12-01-2011, 04:01 AM   #8
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My dad had his in at the dealers yesterday.

They heard the noise when they started it up yesterday but coudn't come to any conclusion what it was. After that they did some diagnostic tests on it and said that the alternator was not performing 100% so it could just be that under strain that was causing the problem. However they didn't think that the alternator was ready to be replaced so suppose we just need to put up with the noise untill it goes.
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      01-13-2012, 08:59 PM   #9
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Having the exact same problem here for a couple of months now... changed the belt tensioner but still doing it. Any updates on this?
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      04-08-2012, 05:05 PM   #10
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Hi guys

Well we finally we managed to get to the bottom of the issue, the noise seems to be coming from the pully that is actually attached to the alternator itself. If anyone has the same issue (from cold, engage drive etc and get a groaning noise) get yourself a new pully that sits on the front of the alternator, it has a reverse slip clutch on it and seems to get worn out.

Cheers
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      12-03-2012, 07:50 AM   #11
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My car is experiencing the same symptoms - I spoke to BMW, and they said that I would have to leave the car overnight for them to figure out the problem. I'd rather just swap out the pulley and hopefully would rectify the issue. - would you happen to have the part number of the pulley?

Any help is much appreciated.
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      08-28-2013, 03:53 PM   #12
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Quote:
Originally Posted by daviep.sco View Post
Hi guys

Well we finally we managed to get to the bottom of the issue, the noise seems to be coming from the pully that is actually attached to the alternator itself. If anyone has the same issue (from cold, engage drive etc and get a groaning noise) get yourself a new pully that sits on the front of the alternator, it has a reverse slip clutch on it and seems to get worn out.

Cheers
Hi Thanks for the information.

I have the same car 320I N46 with automatic transmission and 103,000 Km on the clock. I solved this problem by changing the alternator pully.

The OEM manufacturer is INA and the OE number is "12317560483".

I have the 150A alternator and my car has A/C.
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      08-29-2013, 12:16 PM   #13
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I had exactly the same problem on my previous car (c180 kompressor).

Apparently it's a common thing on most cars with an alternator which has a clutch on the pulley. Not a hard fix.

I have a 320i E90 so I expect to be doing this soon lol.
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      05-06-2014, 07:15 PM   #14
abrahama
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i had the same issue. It was the Timing chain tensioner!
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      08-07-2014, 06:41 AM   #15
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Check the airbox. Could be the rubber support missing under that and it vibrates as it contacts the metal body.
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