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Exhuast advice needed

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by QuottroA4, Apr 10, 2009.

  1. QuottroA4
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    QuottroA4 Member

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    [Apr 10, 2009]
    Hi peeps

    I a couple of problems with my A4 1.9TDI QS (PD130) :crying:

    Firstly, the exhaust rattles..well resonates at idle.

    I have had my local specialist who refitted my turbo have a look at it and there verdict was that the cause of the problem is a stiff flexi joint which is passing the engine vibration on to the exhaust which at low revs is amplifing the problem. Sounds pretty feasable to me with my modicum of knowlege.. However, the problem with this is that the only way to replace the faulty or stiff steel brade is to buy a new downpipe which is VERY expensive as it incorporates the CAT. Alternatively they suggested a De-Cat solution but, Miltek don't do one for the Quattro..... So, that leaves one final option, hack out the CAT and fit some In-Line flexi-brade in its place in the hope that it cures the problem.

    Has anybody else experienced this problem? Is there another cure / solution to this annoying problem? As another issue I have is removing the CAT... As I fear that that in it self will cause problems i.e - More noise, smoke and emissions problems, not to mention the ECU throwin an eppy cause the NOX is too high...

    Any opinions or advise would be greatly appreaciated.

    Secondly (which mybe related to the first problem) I have recently had my turbo taken off and blanced + VNT cleaned at Turbo Dynamics as my engine was very flat power-wise and was making a "whoo-ing" noise when accelerating. I took it to my local specilaist who diagnosed a faulty turbo. (the reason for the turbo being faulty was down the the shitty MTM piece of **** already fitted to the car when I bought it) So, now the car is back complete with re-worked turbo and a proper nice progressive map. However, the "whoo-ing" noise isn't as bad but remains none the less :keule:particulary when the engine is fully warmed up. I have mentioned this to the chap who re-fitted the turbo but he says he has checked for vacuum leaks etc but its all tight. Has anybody here had experience of the same problem? Is there something really daft I have overlooked? :search:

    Again, adivce or pointers are very welcome as I have already spent over £1500 on the car since buying it!! :crying:

    Cheers
    Rich
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  3. J7USS
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    J7USS Shuddup Foooool!!

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    [Apr 10, 2009]
    I have exactly the same problem with mine. The whole exhaust need replacing on mine due to the back boxes rattling aswell.

    Its weird because when I lift up the bonnet, it sounds like my engine is rattling like ****, a little rev and it goes away then idle again and its back....BUT it dont always do it on Idle, Id say 80% of the time. So Annoying. Im changing the whole exhaust though so I aint fussed. take a look at this thread : http://www.audi-sport.net/vb/showthread.php?t=68517

    Im now toying with the Sports cat or the decat. Downpipe and exhaust aint a prob because Ill get one anyway.

    So your not alone mate, Rattle away!!!:huh:
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  4. evilscotsman
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    evilscotsman Space Cowboy

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    [Apr 10, 2009]
    my B5 rattled like crazy, and I tracked it down to the underfloor pressed tin heat shields....the car is covered in them. I found several bolt heads had pulled thru the sheets and they were rattling, pulled em all off and aaaaaaaaah, all quiet.
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  5. QuottroA4
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    QuottroA4 Member

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    [Apr 11, 2009]
    Well I think I have got to the bottom of the "whoo-ing" noise.. Went to my local VW garage for a retaining clip for the EGR pipe (as old one was broken) and I asked the chappie in parts if he knew what the noise might be..he didn't (wouldn't expect him to) so he shot in the workshop and got one the techs to have a listen, straight away he said that it was the alternator pully which was on its way out - told him that I have had a new belt and tensioner recently to which he said that it had put more pressure on the system - hence the noise. So I bought the pully (60 quid) and trotted of home to dig out my haynes man-well

    After a quick look at the job and from reading posts that stated that you need a special tool to do the job, I decided that I should let the pros do it (I am also sick of buggerin around with the car!) So have booked it in next week for it to be done.

    Now, while I am hoping the new pulley will stop the trapped owl under bonnet noise I hedging my betts as to the knackered pully putting extra stain on the engine which is only noticable at low revs...which is in turn vibrating the engine more which is being transmitted down the exhaust pipe?

    Does this make sense guys? Or have a lost the plot completely here?! :think:

    Rich


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  6. J7USS
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    J7USS Shuddup Foooool!!

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    [Apr 11, 2009]
    Hey Rich, you'll have to keep me posted on that mate as I will get mine looked at aswell. Still going to change the exhaust though but its always handy to know...Keep me posted as anything is possible :icon_thumright:
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