Re. Strange cold start on 84 4000 quattro

[Huw Powell]

On 8/9/2010 12:49 AM, urq wrote:
> IME leaks don't reliably go away most of the time ...
>
> I meant to reply earlier ... I wanted to check if the '84 4kQ has CIS-E or
> not ... still haven't done that ... I *think* the comment that you have an
> ISV means that you have CIS-E, but I'm not sure ...

Yeah, the '84 4kq is CIS-E

> I'm most in agreement with Huw's comments.  The first thing I'd do is to
> hook a fuel pressure gauge up and see if the residual pressure is non
> existent.  The comment that it fires right away after cranking a few seconds
> and then shutting off and attempting restart says fuel pressure to me.  You
> may have more than one problem going on too ...
>
> Good luck!
> Steve Buchholz
>
> -----Original Message-----
>
> 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
>
> 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]
>
>
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-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/