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Re: Acceleration when hot

I had this happen twice on two different cars.  One an Audi, and one a
Suburban.  On the Sub, I put a new exhaust on and routed it to close to the
fuel line.  Re-did it and moved it away from the fuel line.  Other problem
was in a 91 200 TQ5S (my did not only rev poorly, but also would stall out).
 After about two years of my playing around with it and taking it to the
Audi dealer as well as the Mercedes dealer, no one could fix it.  One day, I
up and decided to replace the Oxygen sensor.  Problem solved.  However, I am
not sure why.

Anyone else have other ideas?

From: "Fred Munro" <munrof@isys.ca>
To: "Timothy D.R. Morgan" <t.d.r.morgan@csc.liv.ac.uk>
Subject: Re: Acceleration when hot
Date: Tue, Jun 02, 1998, 23:38

-----Original Message-----
From: Timothy D.R. Morgan <t.d.r.morgan@csc.liv.ac.uk>
To: Quattro List <quattro@coimbra.ans.net>
Date: Tuesday, June 02, 1998 12:19 PM
Subject: Acceleration when hot

>Dear QListers,
>I have a problem with my 90qs20v, which has just had a new performance
>manifold fitted about three weeks ago.
>When wanting to accelerate hard, and the engine is really hot i.e.
>having sat in traffic for some time, the engine is really reluctant to
>rev into the upper RPMs. The problem completely disappears once the
>engine has cooled some i.e. once you have been moving for a few mintues.
>I had hoped that the problem would be solved with the new manifold, but
>no such luck.
>Anybody had any similar experiences? fixes?

    Fuel system vapour lock? Do you have an injector cooling fan on your

Fred Munro
'91 200q  253k km