I've got an emissions test coming up, I've got a different CAT I'm putting on to ensure I have every chance of passing.. as I'm kind of convinced my current one isn't working (very well).

The good CAT is on a downpipe with a flexi-joint which is pretty fucked and is blowing. Can I bodge it with GunGum to stop it blowing and sucking in air just for the emissions test? I don't care if it falls off after a day, just need to know if it can be applied well enough and stick for a bit.

Has anyone ever tried it? I would go and do it now but can't get to the car till Monday, need to know if I should make other plans

Oh and I can't cut and weld a new flexi-joint onto the pipe - I have no welding kit or access to any.

Cheeers

Edited 12 February, 201016 yr by CWA

is your's a twin or single pipe dp?

Olly

I've had many a pipe pass an mot wrapped in aluminium tape, get a roll of that.

is your's a twin or single pipe dp?

Olly

Single dude!

Cart is a 1.4 8V btw

I've fixed the gap in the manifold by the way dude, hoping that that is going to be enough to pass my emissions without needing any sensors lol

I've had many a pipe pass an mot wrapped in aluminium tape, get a roll of that.

Cool man, is that just the pipe itself, or did you do it round a flexi-joint? Not sure how that would work.. unless I pulled off all the wire mesh first?

you'd be hard pressed to repair the flexi to be honest, if you put paste/ putty on it as soon as it flexes it'll drop off, i have a 1.0 dp and cat section but iirc the 1.4 has a bigger diameter dp.

Olly

I had a bust flex bit and my dad welded it with a mig welder on the lowest setting and went really slowly!

I've fixed the gap in the manifold by the way dude, hoping that that is going to be enough to pass my emissions without needing any sensors lol

How did you fix it? Enough thread to put a new screw on?

PoloD.

cut out the flexi section and replace it with a piece of straight tubing using clamps etc

the flexi is right at the front about 6" below the manifold skoda boy so wouldn't recommend fitting a straight pipe, the exhaust needs to flex with the engine moving whilst driving / changing gears, if it doesn't it'll soon kill the dp and blow at the mani flange.

Olly

haha, you make it sound like i've never seen one before!!!!!

yes, granted they are suppose to flex a little, hence why they would go to that effort to put one in there in the first place... i still stand by what i said, just whack a piece of pipe in there, the mounts in the exhaust will have enough play to cope with it

i wionder who it was who told the op to check that it was leaking anyhow??

How did you fix it? Enough thread to put a new screw on?

PoloD.

Haha well, not exactly..

I kind of bodged it lol.. gungum ftw maybe 'fixed' wasn't the right word!

The stud is snapped so close to the head that I can't get at it with pliers, the only option was to drill it out in order to put in a new stud. My 'drilling out' skills are really not very developed yet (I had a practise on a snapped heat cover bolt in the exhaust mani and couldn't get it out) so I thought the temporary way would be enough to stop the gas leakage.

Plus I couldn't be arsed pulling off the whole front end, and there is no way I'm taking the head off to start the drilling

cut out the flexi section and replace it with a piece of straight tubing using clamps etc

Hmm I might give that a try.. even if I do get the problem that Olly mentioned, that isn't going to occur between fitting it and taking it to a garage and getting gas analysed is it?

Once that is done and it passes (hopefully!) I can just put the old downpipe with working flexi-joint on, doesn't matter if the cat is fucked as I now hate the environment

What if I chopped away all the braided wire and literally had the flexi hose bit left, then wrapped that with ally exhaust roll.. sealed with gungum. Would that recreate the same problem of restricting movement?

And please don't argue chaps, I think pretty much every person who has collectively helped with my emissions woes on this forum are located in this thread right now.. and I seriously appreciate it!

I've learnt more about engine management and diagnostics from all you guys on here than anywhere else! Can't thank you all enough for the help and guidance, even if the car does end up failing again haha

/end emotional speech :-D Will keep you all posted on what happens..