[urq] Ideas for rough running continued - Solved!

[j.koenig]

Congratulations, Ingo.  The tough ones like this drive one nuts, but solving 
it has to be very satisfying.
John


----- Original Message ----- 
From: "Ingo Rautenberg" <irautenberg at comcast.net>
To: "UrqList" <urq at audifans.com>
Sent: Saturday, March 26, 2005 6:02 PM
Subject: Re: [urq] Ideas for rough running continued - Solved!


It was the Airflow meter.  Now I need to have my exhaust reattached
(currently held together with baling wire).  Really quite remarkable.  After
replacing almost every conceivable possible problematic piece (save entire
engine or turbocharger) with known good, I decided to look at the airflow
metering plate again, which I initially thought was binding, and compared it
with another that I had just recently bought.  What I discovered was that it
was not sticking against the venturi wall, but rather that the pin that
rests on the leaf spring had actually worn a hole in it!  On decel, it would
essentially stick, the pin lodging itself into the hole, choking off air and
fuel.  It would not restart unless I turned the CO screw to richen the
mixture, which would apparently plop the plate up again.  Some pics:

As seen from below (air filter side):
http://www.dtwaudi.com/album_pic.php?pic_id=2093

And from above with mtereing plate removed:
http://www.dtwaudi.com/album_pic.php?pic_id=2094


I highly recommend anyone who has similar sysmptons look at theirs by taking
off their igloo, removing the air metering  plate (10mm bolt) and inspecting
the "rest" area for wear or wear-thru.  Maybe that's your problem, Ed.

Ingo (tired but glad I finally found the problem)

Happy Easter!

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