Loud rattle-type noise under boost (manifold bolts) - Solved!

[kriso]

Just went out in my car and noticed a loud noise when under boost. It only seems to happen when accelerating and the turbo is boosting.

I can't seem to reproduce it when just revving at standstill, but it does sound a bit different.

It was fine earlier today, now this! Any ideas?

 

[Altech]

Could it be one of your boost pipes rattling against something?

I had a similar problem recently and cured it by cable tieing a bit of pipe insulation around one of the boost pipes. It was vibrating against the fuel filter housing and the engine cover.

Mines a TDI though so your 20VT might be different.

 

[kriso]

Could be I suppose. Couldn't see anything loose in the engine bay, but might be the turbo intake pipe underneath. I'll take a look tomorrow and see if I can see anything.

 

[Nath.]

loose turbo mounting bolts ????? but that normally gives exhaust fumes smells inside the car too

blowing exhaust ?????

 

[kriso]

Could be loose bolts but alot louder than I would expect them to be.

My first thought was the exhaust..maybe where the Milltek fits the cat. But I would hope it wouldn't do that! It was only fitted it a few months ago

 

[Elfman]

try this

http://www.seatcupra.net/forums/showthread.php?t=136770

 

[Ric 2001]

loose turbo mounting bolts ????? but that normally gives exhaust fumes smells inside the car too

blowing exhaust ?????

or blow gasket on the manifold to turbo.

 

[kriso]

I think it was the the infamous exhaust manifold to turbo bolts as they were just under a turn loose (I could only see 2). Managed to tighten them up after a load of messing round with extension bars, passing sockets under the big metal pipe with one hand and tightening them with another etc. and took it for a drive and no noise.

I didn't rev it too much as it was cold but was fine up to 3500rpm which was better than yesterday

I wonder how much boost I have been loosing

 

[Nath.]

at least it sounds better eh?

 

[kriso]

yea I don't sound like a chav now

 

[EB20VT]

I think mine and your cars were built at the same time kriso, it seems the same faults affect them both!!!!

Definitely the bolts though.

 

[kriso]

I think mine and your cars were built at the same time kriso, it seems the same faults affect them both!!!!

Definitely the bolts though.

lol yea...what next?! I'm just glad it was an easy-ish fix, at least if it happens again I will know what to do

 

[Ric 2001]

You'll never get to that 3rd bolt without taking the TIP off and the heat sheild at the back. Got this down to 15mins now

 

[kriso]

You'll never get to that 3rd bolt without taking the TIP off and the heat sheild at the back. Got this down to 15mins now

Hopefully that one will stay tight. According to ElsaWin the bolts should be replaced and glue applied to them to stop this re-occuring.

The strut brace makes it and even tighter squeeze. I wonder if I could get a spanner on that 3rd bolt tho?

 

[Ric 2001]

Only other option is to ramp it, be a contortionist and get at it from underneath. WARNING do this when the engine is cold, as your hands are mighty close to the CAT and the turbo.

 

[olliep]

if i have the same problem is it safe/undamaging to drive for a week until i can get it in to sort it??

 

[kriso]

Just don't boost it too much!

 

[Ric 2001]

if i have the same problem is it safe/undamaging to drive for a week until i can get it in to sort it??

Drive with the windows down also.... stops you getting gassed by the exhaust fumes.

Also I went for s/s bolts, as I found a thread DJP started awhile black. Seem to have done the trick so far.

 

[nam]

i have recently started getting like a jingle under full boost in my TDI could i be the same thing? not noticed any smells in teh car or anything.

 

[kriso]

Could be. If it sounds like loose bolts, it probably is