re. Rising and falling throttle at idle.

[Ben Swann]

Rob,

I'll lay odds on the throttle body screw.  O-ring is worn and letting air bypass and can't be adjusted out.  A new screw is a cheap dealer item.

Ben

[Date: Tue, 12 Oct 2004 19:04:33 -0400
From: "Robert Beatty" <beattyr2003 at earthlink.net>
Subject: Rising and falling throttle at idle.
To: <quattro at audifans.com>
Message-ID: <000501c4b0af$d96e5af0$b79379a5 at DFDWZP21>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

89 200TQ thats suddenly started acting slightly odd.  At idle I get a fast 
idle of about 1400 rpm and then once the motor is warmed up, it cycles 
between 1200 and 1600 rpm, cycling about every 2 seconds or so.  I believe 
its a vacuum leak, but I haven't been able to find it yet.  I've checked all 
the connections, looked over the lines and havent seen anything obvious.

Anyone have any experience with this particular leak and remember where it 
was?  If not, how about some ideas on how to find a vacuum leak thats being 
difficult without pulling every single line off the motor and inspecting it?

Thanks,

Rob ]