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Author Subject: Help! Odd noises
ewan_bcfc

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Registered: 27 Dec 2010

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Post #1
I've got a weird fluttering noises overlaid on top of the induction roar.

There's a sort of hiss/whooshy noise that's always been on top of the engine note, but recently it's had a sort of fluttery stammer at highish revs.

I've only noticed it between 5k and 6k under acceleration but it is quite noticeable. Only heard it in the last few hundred miles, and only at high revs.

Should I be concerned? What could it be?

Doesn't seem to be affecting performance or the 'main' engine note.

Anyone have any experience of this or suggestions? Unsure

Should I be mollycoddling the engine till I pin down what the cause is?

Any help very much appreciated guys Thumbs up
Posted 11th Sep 2011 at 23:13
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ewan_bcfc

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Post #2
anyone any ideas?

seems to be getting a bit more noticeable even at moderate revs

my old man said he had to replace the exhaust manifold on his 405 Mi16. does this happen much to the 6/rallye?
Posted 21st Sep 2011 at 22:41
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aaron6

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Post #3
Cracked resonator?

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Posted 22nd Sep 2011 at 13:47
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ewan_bcfc

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Post #4
hmm, would that cracking be visible from the outside?
Posted 22nd Sep 2011 at 18:13
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aaron6

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Post #5
Only if its on a bit you can see. It could easily be on the underside or covered up by the inlet manifold. Not sure how to check without taking off the inlet which would be a right ball ache if ends up not being that. Although it could well be id imaging. If you get shite replies it might pay to start another thread about checking methods to get the desired response. Smile

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Posted 22nd Sep 2011 at 21:10
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swiftyboi006

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Post #6
The inlet is a 10 min job to take off with correct tools and knoweledge.n worth changing the gasket wile ur at it

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cherry p1.....SOLD (regreting this)
blaze p2.....why did i buy this SOLD
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Posted 23rd Sep 2011 at 13:39
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swiftyboi006

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Post #7
Although if there was a crack in the resonator then it would be leaking air resulting in problems wen idleing

________________________________________

cherry p1.....SOLD (regreting this)
blaze p2.....why did i buy this SOLD
Black p3 Love
Posted 23rd Sep 2011 at 13:40
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aaron6

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Post #8
If its only a tiny crack would it be noticeable on idle though?

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Posted 23rd Sep 2011 at 15:07
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ewan_bcfc

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Post #9
had the inlet off and on again the other day to get at an oil leak, so the gasket it brand new. didn't spot any cracks in the resonator, but wasn't looking for them...

the idle isn't particularly smooth, but i wouldn't call it bad by any means. what sort of idling problems would i get?

i'm working on getting a sound clip of the noise, but i've lost the usb lead for my camera Crazy

cheers for the thoughts so far guys Thumbs up
Posted 23rd Sep 2011 at 18:45
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aaron6

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Post #10
Hmmm... If it ain't that then i haven't a clue at the moment. A sound clip would be awesome for sure. Smile

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See the sheer power and might of the lesser known burrowing owl.



Posted 24th Sep 2011 at 07:04
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swiftyboi006

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Post #11
Jus nip the inlet off and the resonator n have a quick check

________________________________________

cherry p1.....SOLD (regreting this)
blaze p2.....why did i buy this SOLD
Black p3 Love
Posted 25th Sep 2011 at 22:24
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ewan_bcfc

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Post #12
yeh it might have to come to that, only with my mechanical skills and access to tools, 'nip' isn't the term i'd use for the job!

i'll try and get a sound clip up when i get a new lead

how easy is it to get the resonator off the manifold? i'm assuming you can't get it off with the manifold still on
Posted 25th Sep 2011 at 23:06
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aaron6

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Post #13
Nat, you'll have to take on the manifold and then remove it. I suspect there will be just a couple of support screws and that will be it. Smile

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See the sheer power and might of the lesser known burrowing owl.



Posted 26th Sep 2011 at 06:12
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ewan_bcfc

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Post #14
Finally managed to get a little video up.

You can hear it clearly around 7 or 8 seconds. The way the file has been compressed actually makes it sound worse that it is, as in reality it doesn't drown out the induction roar, and the car doesn't actually stutter and lose power like it sounds like it does.

Vid here:

Clicky

Anyone recognise this sounds as something they've had before?

Also, what's the danger of a cracked resonator spitting bits into my engine? Shock
Posted 26th Sep 2011 at 23:05
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aaron6

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Post #15
That's sounds similar to mine when steel gasket joining the cat to the exhaust manifold started to let go. Cheap fix. Definatly worth a look. Smile

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See the sheer power and might of the lesser known burrowing owl.



Posted 27th Sep 2011 at 10:06
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ewan_bcfc

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Post #16
ah, interesting. could be, i can smell exhaust gases from the rear of the engine bay with the bonnet up. maybe should have mentioned that earlier, actually... Wink

is this the sort of thing a beginner can fix, or for the time involved would i be best just getting it booked in someplace?
Posted 27th Sep 2011 at 14:32
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aaron6

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Post #17
I booked it in and it only came to £25. Well worth a look. Sorry i didn't think of it earlier. Smile

________________________________________

See the sheer power and might of the lesser known burrowing owl.



Posted 27th Sep 2011 at 15:10
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aaron6

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Post #18
Once you find out what the problem is can you post your info? Be good to know. Smile

________________________________________

See the sheer power and might of the lesser known burrowing owl.



Posted 27th Sep 2011 at 15:11
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ewan_bcfc

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Post #19
Righto, thanks very much.

I'll try and get this sorted sometime, I'll post back when it's either fixed, or not!

Cheers
Posted 27th Sep 2011 at 15:34
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ewan_bcfc

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Post #20
Right, so Deepak sorted the noise for me earlier on.

Turns out the exhaust was blowing between the manifold and the cat, so the brownie points go to eagle-eared (pretty sure that's the phrase) aaron6!!

Cheers for the help chaps, much appreciated
Posted 30th Sep 2011 at 19:59
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aaron6

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Post #21
Your welcome buddy, glad to help. Sorry about the bum steer with the resonator though. Smile

________________________________________

See the sheer power and might of the lesser known burrowing owl.



Posted 30th Sep 2011 at 20:13
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ewan_bcfc

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Posts: 131

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Post #22
No worries, glad the resonator's okay. For now at least :-P
Posted 30th Sep 2011 at 22:06
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