Re. Strange cold start on 84 4000 quattro

[Johnny B]

Ok well pretty sure you hit the nail on the head here. I noticed a lot of oil seapgae just beneath the X tube above the valve cover which is prone to failure. I ordered the silicone replacement for the X & ISV tube from 034 as well as 10' of vacuum tubing. I am going to replace it all when it arrives and check over everything with chemtool to ensure no more leaks... 

From: benswann at verizon.net
To: pre95 at live.com
CC: quattro at audifans.com
Subject: Re. Strange cold start on 84 4000 quattro
Date: Sun, 8 Aug 2010 18:32:05 -0400








Message body






Nothing strange about it - you have a vacuum leak (or several vaccum leaks).  From your description, you have a massive leak.

If you don't find anything obvious, pull injectors and replace the O-ring seals.  They are probably due for replacement anyway.

Ben


http://www.gtquattro.com/FAQ.html




[Date: Sun, 8 Aug 2010 11:03:02 -0700


From: Johnny B <pre95 at live.com>


Subject: Strange cold start on 84 4000 quattro


To: <quattro at audifans.com>


Message-ID: <BLU142-W17CFCE6FC3AF5EDC1EDEA8C8930 at phx.gbl>


Content-Type: text/plain; charset="iso-8859-1"




Ran in to a very strange cold start issue this morning on my newly acquired 84 4kq. The previous owner had warned me about it, but the symptoms he described didnt make sense to me. And, after this morning, it really doesnt make sense! 

The car turns over but doesnt fire. After letting it sit for a few seconds, it turns over and coughs, but misses. More turning over and then finally it fires and coughs to life. Very choppy but after a few blips on the throttle it smooths out to a nice idle just above 1k rpm. I notice here when I blipped the throttle a few times it sounded like the motor was bogging, and the intake was quite  loud. 

I bring the RPM's up to 2k and its smooth, but at 2200 RPM it bogs itself down and brings the RPM back to 2k. If I hold lightly on the throttle bringing the RPM up it will cycle this (up to 2200, bog, back down to 2k, up to 2200, bog, down to 2k etc etc). If you floor it, it just bogs harder. After letting it idle (which during all of this it's idling very smooth) 30-45 seconds, all symptoms go away. Runs smooth, rev's  up as it should, all problems go away. There was no smoke at start up..

 I'm definitely stumped.....


Insight appreciated!


Johnny]