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Drivetrain Gearbox, Diffs & Driveshafts etc

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Old 29 August 2002, 16:50   #1
V5
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Question

My wife's MX5 (mk1) is emitting a buzzing/vibrating noise from the exhaust (we think) at certain revs. Now, it's mounted (hung) from rubber straps, so I don't think it's something wrong with the fitting. We're thinking that perhaps the baffles are loose in the silencer. I popped into Kwik-Fit to see what they think/charge for a replacement and they guy in there said that it (loose baffles) was an MOT failure. Now I've had a company car for a few years, so I'm not too sure about this. Can anyone confirm this for me?

Also, if it is loose baffles(not sure how I could confirm that), is a replacement the only way? They, Kwik-Fit, are charging 157 inc fitting and VAT. Anyone know where we could get something cheaper? I have STFW , but not seen anything yet.

Many thanks in advance.
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Old 29 August 2002, 16:52   #2
V5
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@rse - I hate it when you get a typo in the subject header!!

Quote:
Loose Exhaust Baffles - and MOT Failure???
...an MOT....

D'oh
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Old 29 August 2002, 16:55   #3
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Shouldn't do - unless its creating the noise to be over the legal limit.

Providing the CAT still works and is doing its job so it passes the emmissions test then its fine

I did tell her (The MX5 is my sis's ) just to go and get a big F Off loud jap stylie stainless steel job but she wasn't having none of it!!!! Then me and her could have zorst wars
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Old 29 August 2002, 16:56   #4
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And on another note - never listen to a word Kwik Fit say - you're better off by far going elsewhere IMHO
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Old 29 August 2002, 16:59   #5
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Not good news I know, but I have heard exhausts rattle in the manner you describe if the catalyst is breaking up - basically the cat honeycomb structure gets slightly samller as it rattles and is no longer a tight fit in the pipe - thus vibrates at certain revs - usually on trailing throttle/overrun.

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Old 29 August 2002, 17:00   #6
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Quote:
Shouldn't do - unless its creating the noise to be over the legal limit
He was on about emissions, and I didn't really believe him , hence the post

Quote:
zorst wars
They (my now wife and in-laws) appeared quite normal before all the legal stuff got finalised. Talk about being lulled into a false sense of security!
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Old 29 August 2002, 17:02   #7
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Dr Hu hope not! The noise does appear to be coming from the back of the car, and the cat is very much up the front.
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Old 29 August 2002, 17:03   #8
Dr Hu
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just remembered the time honoured fix for loose things in the exhaust is to make then tight again by reshaping the exhaust to make the loose bit tight again.

What i'm trying to say is....whack it with the biggest hammer you can find and see if it stops or changes it - you may not have anything to lose if you're having to change it anyway - it may save you the cost & bother.
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Old 29 August 2002, 17:06   #9
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He's talking crap then My 306 had a faulty CAT and still passed the emissions test!!!!

LOL - mwaaaaaahahahaha - our plan is working
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Old 29 August 2002, 18:08   #10
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Red face

The silencer thing on my Blitz NURspec rattles at low revs & i've just got sum bandage type stuff which can take temps 2 650c so i'm hoping i will b able to wrap that around the silencer b4 screwing it in & it will prevent the silencer rattling against the backbox. Dunno if that's similar 2 wot yer askin but i'm only doing it since it sounds cheap & if i dont have silencer then neighbours r guna lynch me
Si
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Old 29 August 2002, 18:42   #11
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it should pass providing it is not blowing excessivly it is in it's mountings of which none are broken and it passes the emissions test and it's not hitting the bodywork then loose baffles will not matter, you would have to be a really mean tester to fail it on that. i wouldn't
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Old 29 August 2002, 18:44   #12
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take the car for an mot its on 30 if it fails you know you need the new exhaust, if doesnt it 30 instead of 160. If it is knackerd try Merit tyres in Kingston as they are reasonably priced.

[Edited by Krade - 8/29/2002 6:45:17 PM]
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Old 29 August 2002, 18:59   #13
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Si,

James Harvey wrapped some exhaust tape/bandage round his Nur Spec silencer/bung and he said it really cut the rattle down loads, didn't cure it but was much better.....

Cheers
Neil
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Old 29 August 2002, 19:54   #14
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Cheers guys.

The car is obviously sulking - this has only started since we began talking about upgrading to a mk2

I don't know about the "whack it" idea....might resort to that. Certainly won't be replacing just because of the emissions test.

So does anyone know the best place for replacement exhausts (other than Kwik Fit)?
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Old 29 August 2002, 20:05   #15
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Had also posted on mx5mods.com and have been pointed at mx5parts.co.uk where they do a replacement for 109 inc vat.
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Old 30 August 2002, 11:39   #16
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Buy the cheapest (if you have to) and I'll fit it!!!
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Old 30 August 2002, 11:57   #17
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Cheers ears




<Still hoping we...errrr...I don't have to fork out!>

[Edited by V5 - 8/30/2002 11:58:17 AM]
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Old 30 August 2002, 12:46   #18
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Old 30 August 2002, 15:05   #19
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Had some more replies from mx5mods.com and they are saying it's most likely a loose heatshield :
Quote:
The noise will be from a loose heatshield! Almost every '5 has had this problem if its over a few years old.
and
Quote:
I would tend to agree with Glynn on this one... It's most liekly to be a heatshield and I reckon it is probably the one that goes above the small centre expansion box. Two large jubilee clips and a bit of scrawming under the car should fix it. Mine's done the same, mostly around the 2000-2500 rpm mark.
Fingers crossed!! Will have a look at the weekend.
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Old 30 August 2002, 15:10   #20
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pesky bl00dy heat sheilds - mine did after fitting my downpipe - well annoying it was!!!! sorted now
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Old 30 August 2002, 15:22   #21
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Question

Corner?
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Old 30 August 2002, 15:23   #22
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woohoo!

My first!
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Old 30 August 2002, 15:23
 
 
 
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Tags
baffle, baffles, car, cat, exhaust, exhuast, heat, l200, loose, make, mx5, rattle, rattling, shield, tight, tighten


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