5000TQ deceleration and stalling

[barry at moonbeast.com]

Yeah-- you may be right.  I'm not sure my ISV is working properly, but I did 
swap in a spare which didn't seem to have any effect on the idling problem 
whatsoever.  I could easily have two bad ISVs though, as I pulled the spare 
from a junker.  Both do operate when voltage is applied, and both have been 
pretty thoroughly de-gunkified.  I haven't checked to make sure the ISV wiring 
is good though, and they may be sticking, I don't know.  New ones are about 
$140.00 however, and I'm not yet ready to throw that kind of cash at the 
problem.

In any case-- after I got the throttle switch resoldered, the behavior of the 
car is MUCH improved.  It starts right away and idles fine; however, about a 
minute or so later, the idle drops to about 500rpm and it struggles, so it 
would seem that I haven't completely solved the problem.  After blipping the 
throttle a few times the idle settles again to about 900rpm.  From there on 
out, there's nary a problem.  In the stop and go traffic on the way to work, it 
never dropped below 900, and would slowly climb to a stable 1100rpm after a few 
moments off the accelerator.

So far so good.  I may do a bit more troubleshooting this weekend.
=BB=


Quoting Ben Swann <benswann at comcast.net>:

> This is one time I'd suggest the obvious culprit - the Idle Stabilizer
> Valve.  It is probably sticking closed or possibly not getting a good
> connection.
> 
> Often problems are high idle and caused more by throttle body switch or
> wiring, but in this case I'd rule out the valve first.  Usually it sticks
> open causing a high idle, but can stick closed or not be getting a good
> electrical contact.
> 
> Ben
> 
> [Date: Wed, 27 Jul 2005 15:42:12 -0400
> From: "Stricker, Michael" <Michael.Stricker at gd-ais.com>
> Subject: 5000TQ deceleration and stalling
> To: <quattro at audifans.com>
> Message-ID:
> <F1FF190DD197D24888AD1D460715E304158913 at MAPF01-MAIL01.ad.gd-ais.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hi,
> 
> My 1988 5ktq has an intermittent problem where it sometimes stalls upon
> deceleration.  If I "blip" the throttle a couple of times as I see the RPM's
> heading toward 0, I can avoid this problem.  So far, I've disconnected the
> deceleration valve to no avail.  It seems to do this only after the vehicle
> has warmed up so I suspect it is temperature related.
> 
> Does anybody have any ideas of what to try next?
> 
> Thanks in advance.
> 
> Mike]
> 
> 
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