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Author Topic: 16v ABF exhaust!  (Read 2010 times)

Offline nic-clark

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16v ABF exhaust!
« on: 20 January 2011, 14:33 »
Hi,

The exhaust on my GTi is driving me mad. I bought it a while ago and it had been de-catted and had a hole in the middle box. Thought it would just be a simple case of repairing this, boy was I wrong!

Had a cat and mid box put on, rattled on the beam for ages until we changed the box for a different make. It no longer rattles on the beam or body but it vibrates something chronic through the floor at about 2700-3000 revs and sounds a bit rubbish at idle. The guy at the exhaust shop found the heatshield from the downpipe was loose so clamped it just before the cat. Sounds a bit better but the vibration is worse! He's gonna change the middle box again but I'm not holding out much hope. I found a thread about an engine mount being cracked causing vibration, but I'm not sure! Anyone got any experience of this or any ideas?

Cheers
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Offline tweed

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Re: 16v ABF exhaust!
« Reply #1 on: 20 January 2011, 18:17 »
I had this on my 16v. it was due to me manifold flexing to much and hitting a heatshield when accelerating
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Offline Jimmy Filth

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Re: 16v ABF exhaust!
« Reply #2 on: 20 January 2011, 19:07 »
I have this problem at the minute too
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Offline nic-clark

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Re: 16v ABF exhaust!
« Reply #3 on: 20 January 2011, 21:20 »
Thanks for replying, any ideas what would make it better? If I remember right from my old MK2, the manifold fits to the exhaust with some flexible clips... if this is the same on the MK3, does this need replacing?

Cheers  :smiley:
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Offline dom

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Re: 16v ABF exhaust!
« Reply #4 on: 20 January 2011, 21:43 »
I'm guessing you've checked that it's not the heatshield that runs above the middle box? Also are all of the rubber hangers ok? Mine was doing this due to perished rubbers on the middle box bracket causing the exhaust to drop and touch one of the metal brackets that run under the exhaust.
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Offline Gash

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Re: 16v ABF exhaust!
« Reply #5 on: 20 January 2011, 22:43 »
my 16v does it too! hah
solution take off the heat sheilding does f**k all anyways
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Offline Wayne

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Re: 16v ABF exhaust!
« Reply #6 on: 20 January 2011, 23:43 »
Make sure the clamp is not catching the rear beam and also check all you engine mounts.
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Offline Len

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Re: 16v ABF exhaust!
« Reply #7 on: 21 January 2011, 13:07 »
It will be the rubber mounts on the middle box.

Get some of these! http://www.powerflex.co.uk/product-details/Exhaust+Mounts/981.html
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Offline nic-clark

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Re: 16v ABF exhaust!
« Reply #8 on: 24 January 2011, 09:29 »
Thanks for the help, will try all of these and report back! It will be fixed  :smiley:
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Offline richking

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Re: 16v ABF exhaust!
« Reply #9 on: 24 January 2011, 13:23 »
I had a problem with my exhaust knocking on the rear beam after i fitted a new cat. After a few weeks of investigating it turned out the new cat was about 20mm longer than the old one and had pushed the whole exhaust back causing the knocking. I ended up getting the grinder out and cutting about 20mm off the new cat and the problem went away.
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