ratty noise comin from cat area

[Chris87]

my exhaust is driving me nuts and need a helping hand...i bought mi 182 about 3 months ago now and when i bought it the guy said it had a new cat put on...fair enough so i went ahead with the sale... a month later a noticed that there was a weird ratty noise coming from the exhaust everytime i accelerated over 3k revs so i looked at the exhaust and noticed it was rotted and purchased a janspeed and when i has that fitted the guy at the garage said the cat is not the original one...its a euro universal one basically i cheap cat and now i still have the same prob with the brand new exhaust do you think the universal cat has anything to do with the noise im getting
sorry for the long paragraph but do need some advice
cheers
chris

 

[Poopensharten]

It could be the baffles inside the baffle box failed as oposed to the actual cat itself? That or a clasp has came loose? Have you had a feel about?

Jack it up when its cold and see if you can see anything, then have a feel when its warm (obviously the metal will expand once heated) that should eliminae any foul play?

 

[Chris87]

hope its not the baffles lol hoping it could be a clasp but need to have a feel about hmm its a weird sound

 

[Chris87]

i have had a look underneath and all the clasps seem to be fine

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[keirravn]

it might be the heat shield? tap it with your fingers see if it rattles? if its the baffles a whack with a hammer might help

 

[Chris87]

it might be the heat shield? tap it with your fingers see if it rattles? if its the baffles a whack with a hammer might help

ah thats a thought the heatshield i'll have quick look at it i'll take the bloody thing off is its that causing problems...sorry for been thick but where abouts are the baffles?

 

[Chris87]

just looked at the heatshield and tapped it but nothing rattled or anything but would it be worth taking it off?

 

[Poopensharten]

Nah leave it on if theres no excess movement!

 

[Will.]

Mine was a loose lamdba (sp) sensor. Tightened it up and the rattle went.

 

[Chris87]

i'll have a look at that...best i can describe the sound is like tinny sound over 3k revs then it goes after 4.5k revs

 

[Will.]

That's the same sound I had.

 

[Chris87]

That's the same sound I had.

hmm cant be the lamba sensor just this min went out and checked it is that the lead that connects to the cat?

 

[hipwell]

ill have a look sometime this week for you mate. Who fit the exhaust?

I can see 2 things there that dont look right. There is no manifold to cat springs, it looks like someone has just tried bolting it to the manifold with random nuts and bolts.

And also whoever has fit your exhaust has not used the clamp provided by ktec to clamp the sleeve olive joint onto the center section and have welded/soldered it in place which may not be sealed or tight enough.

or it could be that heat shield.

 

[Chris87]

r8 matt hows it going...yeah that would be great the welding was done by this kid i know it didnt fit right to the cat as its not the original one its a universal one cheapo cat....so little welding has to be done to stop the blowing but the noise was there before it was welded could be something to do with the connection of the cat to the mani like you said

 

[keirravn]

ah thats a thought the heatshield i'll have quick look at it i'll take the bloody thing off is its that causing problems...sorry for been thick but where abouts are the baffles?

baffles are inside the exhaust silencers, might sound like the cat though! in the silencer if its loose denting the exterior can often fix it as it holds the loose baffle plate in place, i dont know if there is something similar in the cat though maybe someone else?

 

[Chris87]

baffles are inside the exhaust silencers, might sound like the cat though! in the silencer if its loose denting the exterior can often fix it as it holds the loose baffle plate in place, i dont know if there is something similar in the cat though maybe someone else?

yeah i think its the cat my mate has spotted that there is springs missing from where the cat connects to the mani that may be causing it but i might take the heatshield off