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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Knocking sound under bonnet. HELP



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      01-18-2013, 06:51 AM   #1
showmerico
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Exclamation Knocking sound under bonnet. HELP

I drive a BMW 3 series Coupe e92 2007 AUTO it's driven about 44k miles since I've bought the car i've had nothing but problems.

The differential went but that was covered by the dealer i bought it from.

Now just after the warranty has expired there is a knocking sound that has got progressively worse.

You can hear it when inside the car, it seems to be nearer towards the passenger side and you are only able to hear it when the car is in D or R. You cant hear the noise when your driving its generally when your coming to a stop and the revs are lowering.

I've tried reading some forums and from what i've gathered there are a few different things it could be.

water pump, alternator, engine mount, fuel injectors, pistons.

Just want some clarity around the issue, BMW dealers are expensive and are useless. I wondered if anyone knew any BMW Specialists near Crystal Palace, South London.

Or if anyone has experienced the same issue and could potentially help.
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      01-20-2013, 09:35 PM   #2
07lilredwagon
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Does the tapping increase with engine speed?

Talk to us about your maintenance regimen....oil changes on time, proper oil, etc...?

I think you may need to employ an inexpensive tool called a stethoscope. any autoparts store has them.....I have used a length of hose and small funnel in a pinch...but you basically put the end of the hose on different parts of the engine until you locate the tapping...(yes, while it is running....but PLEASE BE CAREFUL around the spinning and whirling bits)

Once you have isolated the sounds to where they are the loudest you can deduce whats wrong.

Use a second person to get in the car, and with their foot on the brake, put the car in drive, then in reverse, you may be able to hear whats going on when the "boot" is open.

good luck....

JP
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      01-21-2013, 04:40 PM   #3
showmerico
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Update

Quote:
Originally Posted by 07lilredwagon View Post
Does the tapping increase with engine speed?

Talk to us about your maintenance regimen....oil changes on time, proper oil, etc...?

I think you may need to employ an inexpensive tool called a stethoscope. any autoparts store has them.....I have used a length of hose and small funnel in a pinch...but you basically put the end of the hose on different parts of the engine until you locate the tapping...(yes, while it is running....but PLEASE BE CAREFUL around the spinning and whirling bits)

Once you have isolated the sounds to where they are the loudest you can deduce whats wrong.

Use a second person to get in the car, and with their foot on the brake, put the car in drive, then in reverse, you may be able to hear whats going on when the "boot" is open.

good luck....

JP
So I only put purchased the car in September and the car has a full service history. The car is due for a service next month, oil levels are fine. I topped it up recently with 0W30esp MobilOne which BMW recommend you use on the car.

I took the car to a mechanic today who is a friend of a friend, he stuck it on the MOT test that shakes the car from side to side and went underneath the car.

He was adamant that the sound is coming from the front arm on the suspension on the passenger side that has worn and is knocking. He showed me the movement and says that the other one has wear so it's better to replace both. Recommended that I look on GSF and europarts.

So he recommended that I go for the Lemforder brand plus europarts have discount on all parts at the moment. But I'm wondering if its better to go to BMW and pay the premium, will they be any better then the Lemforder part?

Plus I'm wondering if I also have to replace the bushes?
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      01-21-2013, 07:13 PM   #4
AlanAZ
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Lemforder supplies parts to BMW, so they're good. The better suspension parts are Meyle HD (Heavy Duty) w/4 yr warranty. They have most E9x parts available in HD.

http://www.meyle.com/EN/Spare-parts/MEYLE-HD.html

http://www.e90post.com/forums/search...rchid=25269651
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      01-22-2013, 03:45 AM   #5
showmerico
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Buying these parts

Quote:
Originally Posted by AlanAZ View Post
Lemforder supplies parts to BMW, so they're good. The better suspension parts are Meyle HD (Heavy Duty) w/4 yr warranty. They have most E9x parts available in HD.

http://www.meyle.com/EN/Spare-parts/MEYLE-HD.html

http://www.e90post.com/forums/search...rchid=25269651
Amazing thank you for the response.

Been looking for the Meyle HD part you recommended can't seem to find uk stockists, I've seen them on eBay but they are quite cheap so I'm a bit hesitant.

http://r.ebay.com/8sGo04

They're being shipped directly from Germany and the person has great feedback I just don't know if its worth shaving off say 40.
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      01-22-2013, 12:49 PM   #6
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Quote:
Originally Posted by showmerico View Post
Amazing thank you for the response.

Been looking for the Meyle HD part you recommended can't seem to find uk stockists, I've seen them on eBay but they are quite cheap so I'm a bit hesitant.
I've run Meyle HD suspension parts on both my previous E46 and current E90, and I can attest to their quality and longevity.
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