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Discussion Starter #1
Hi there. I am a new forum member but a BMW veteran (on my 5th).
I have recently acquired a 330Ci Convertible '53 plate with 52k genuine miles.
At speeds above 40mph a pulsating noise occurs, rather like that awful noise you get when you drive over concreted motorways. It isn't induction and I don't think it is exhaust as it has a sort of cyclical pattern. I can't tell where it is coming from and it sounds like road noise except for the fact that it is not constant.

Any ideas?
 

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from that description i wouldnt even like to hazard a guess...
 

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Hi,
It's funny, I was doing a search for clues as my 51 plate 325 cabriolet has started doing this.
Personally noticable over 50mph and more felt than audible.
If I can help to shed light on symptoms at least perhaps we can both benefit?

1) at 50+ mph can feel the originally described bumping. Regular and consistant like driving a concrete motorway. can feel it through pedals and foot rest to left of clutch in all gears (those you can test at 50) clutch in or out.

2) It becomes more apparent at higher speed. I.e. at 70 can feel it through the seat and by putting hand on transmission tunnel just behind rear seats.

3) Interestingly today, I tried driving a range of different bumps. Personally the lumps transferred through the steering wheel. It doesn't with this bumping...

Still vague, but I'm at a loss too! But all the same worried.

Jeremy, Sorry if I'm on about smething different, if so I'll remove and create a new topic.
 

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Discussion Starter #6
Thanks to all those who have replied...

chrismiffo - the car is not a steptronic auto it is a manual

hooded - your's sounds like a very similar problem, especially "more felt than heard"
I phoned an independent BMW specialist and he has offered to test the car and see if he can diagnose the problem before he starts doing anything blindly.
Still there today and maybe getting worse...can't tell if it changes with operating temperature
hooded - if I get an answer I will be sure to post it but stay in touch in the meantime
Thanks to all and still keep the ideas coming.
 

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I'm sure checking it today on the commute home it did not do it until the car was up to opperating temperature, but then the car gets to the right temp quickly and the roads are too bumpy at that point :( so difficult to tell for sure.

Contary to before I'm thinking the knocking is coming from the rear passenger side. - Nothing loose under the car that I can tell either.

I called my Dad (Works for BMW) ;) will be having the car looked at next week. But I only have 10 days of warranty left - eek!

Oh, and personally mine is manual. - What's yours Jeremy?
 

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a friend of mine had a similar problem to what you 2 guys are describing.
he went to the lengths of changing a wheel bearing before borrowing my wheels while his were refurbed...turns out it was tyre roar from a cheap chinese tyre (wanli) might be an idea to swap your tyres about to see if it makes a difference
 

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Discussion Starter #9
Mine is a manual, hooded, and still doing it.
Trying to get it checked next week, before I go on a long journey.
Wheel bearing sounds like a possibility.
Tyres are all newish and good Michelin Sports
No warranty...!
 

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Won't rule out tyre roar butthis is too sudden and too violent for a bit of tyre roar IMO.
I have Parrillis (Excuse spelling) all round about half way through their life.
I though wheel bearings made a whiring noise????
I wondered whether a wheel weight missing would cause this?
I hope to have a close look tomorrow, fingers crossed.Any ideas welcomed :)
 
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