quattro digest, Vol 1 #4067 - 91 100 Rough idle and no throttle response after warmup

[Larry C Leung]

There are a LOT of connectors related to sensors right along the cowling.
Any chance that one of them was disconnected when you were tugging
and pulling and yanking on the blower box? FWIW, when I change the
heater core (yup, it's due) I'm going to try to remove the hood when I do
this.
The diff is, my heater box isn't as glued down as it originally was, I
pulled it
up partway to do the stupid blower motor a few years ago.

HTH,

LL - NY




> Date: Sun, 13 Oct 2002 10:33:16 -0400
> From: SJ <syljay at optonline.net>
> Subject: 91 100  Rough idle and no throttle response after warmup
> To: quattro at audifans.com
>
> I'm working on a friends car . . .putting in new heater blower motor
> . . . .
> what a PTA job!!!
>
> He bought this car about a month ago . . .no history on previous
> owner or
> service done.
>
> Patient is 91 100, non turbo, non quattro, auto trans, 5 cyl
> engine.
>
> Car ran fine when I drove it to my house for the repairs. Now after
> a couple
> of days; I started it up and it ran fine . . idle works, throttle
> works.
> After a few minutes warm up, it starts running a bit rough and there
> is no
> throttle response. Operating the throttle valve by hand produces no
> RPM
> increase. Its as if the throttle valve was disconnected.
>
> Sounds like a stuck air flow sensor in the fuel distributor? I'll
> have a
> looksee at that later today and clean it out. Might as well clean
> out the
> ISV valve while I'm at it. And take a look at the air filter . . .I
> bet that
> was'nt changed for a long time. Mechanics find it too hard to get
> at.
>
> Any other BTDT's on this problem?
>
> Thanks
> Syl
> 88 5kq
> 90 100q
>