re. Help - 200TQ big boost leak on trip

[Kurt Deschler]

Thanks Ben. I'll look at the ECU plumbing. I forgot to mention that it is 
an 89 with an MC2 engine. The air surge is accompanied by low boost. With 
the windows open, it sounds like a big boost leak under the hood, but it 
hard to tell while driving. I searched the archive and torn wastegate 
diaphragm sounded like a possibility as well. I will pull all this apart 
tomorrow.

 	-Kurt

On Fri, 9 Jun 2006, Ben Swann wrote:

> Sounds like you shold be looking for a leak at the ECU where the line goes
> in - probably a cracked pressure damper - the clear plastic  thingy that
> looks like a fuel filter without the innards.
>
>
>
> Ben
>
> benswann at comcast.net
>
> 83 urq, /[][] =oooo= [][]\ alpine and Inga
>
> '90 Coupe Quattro (==\ oooo /==) ES2 Conversion
>
> 91 200qa20v, [ =!\=oooo=/!= ] avant and sedan
>
> [Date: Thu, 8 Jun 2006 18:38:37 -0400 (EDT)
>
> From: Kurt Deschler <desch at alum.wpi.edu>
>
> Subject: Help - 200TQ big boost leak on trip
>
> To: quattro at audifans.com
>
> Message-ID: <Pine.LNX.4.63.0606081823240.23100 at cs.wpi.edu>
>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
>
>
> We are on our way from massachusetts to michigan and having a problem with
> the 200. Under boost, there is a surge of air into the cabin through the
> vents. The engine bucks a little also. I turned off the climate control and
> still the same so it seems like a big boost leak. I looked around the
> pressure hoses and can't see anything obvious except a small amount of oil
> on the rubber hose from the J hose to the intercooler. I don't want to mess
> with it on the road and make it worse since I don't have many tools with me.
> I thought that you could force the engine to boost by pinching off the lower
> wastegate hose.  At least then I could hear where the leak is. If anyone has
> any ideas or can help, I am headed down I90 almost to NY. I'm mobile on the
> laptop so I will get any emails right away.  For now, we will try to stay
> off the boost.
>
>
>
>      -Kurt]
>
>