Rough Idle

[bludodger at att.net]

A little update on my stalling when cold and coming to a
stop/rough idle prob. It seems that the car "acts" up
here and there (1 out of 4 cold starts) the other times
it is just fine. In fact, when it is acting up I can
turn the ignition off and then right back on it most
likely will run properly.

So knowing this, I have a(nother) "quick" question about
my rough idle and stalling problem:

My next steps on solving this problem was to either be
to replace the breather hose or the o2 sensor. Would
either of these replacements likely be causing an
intermitenent problem like I am having? Should I be
looking somewhere else (wires, plugs, cap, rotors)?

TIA

Blu

Forgot to mention that the caps, rotors, plugs and wires
were replaced recently and should all be OK.


--
Blu
'88 80q--175,000mi.



Thanks for the reply. Just replaced temp. sender and
although I now have a temp gauge that works (always a
plus on an old audi), it really did nothing for the idle
problem. In addition to the rough idle (and the car
running rich-let's hope that the o2 sensor solves this
part of prob.), the car stalls when the engine is cold
and it is brought to a complete stop (first couple of
stop signs around the neighborhood). Once warm, the car
then performs pretty well (i.e. 26+ mpg over 3-4 gas
tanks). Assuming that it isn't the O2 sensor, which I
hope to replace in the next couple of days, do you think
the deceleration valve might be a possibility? I've
heard that they sometimes stick when the car is cold
which causes a huge vacuum leak. Would I have to replace
this part or can it be cleaned? Where can I find one?

thanks again


--
Blu
'88 80q--175,000mi.
>
>
> bludodger at att.net wrote:
> >
> > I am trying to solve my rough idle problems and have
a
> > few questions. There is a distinct clicking (sounds
> > electrical) coming from what seems like the throttle
> > body when the car is at idle. It happens
intermittently
> > and is quite clear (although I can't see the part
that
> > is causing it). Is this a normal occurrence? Could
the
> > clicking lead me to the solution?
>
> nah, that's the carbon canister frequency valve
working properly.
>
> > I have cleaned the ISV and this has not helped my
> > problem. My next steps are replacing the temp. sender
> > and the O2 sensor. A quick question about the O2
> > sensor...will I be splicing the new one at the Cat.
> > of the line or at the engine connection end? I am
> > planning to use the Mustang V8 O2 sensor. Anything
else
> > I should know about the Sensor replacement procedure?
>
> you're gonna hate it.  as far as splicing, do it out
of the car.  remove
> old sensor.  unplug it.  bring inside.  splice new
sensor on, making the
> wires maybe slightly longer when you are done.  return
to car, install
> and plug it back in.
>
> > How likely is the temp. sender the culprit?
>
> it could be... have you checked the cap/rotor/plugs
condition?
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi/
>
> http://www.humanthoughts.org/

>
>
> bludodger at att.net wrote:
> >
> > I am trying to solve my rough idle problems and have
a
> > few questions. There is a distinct clicking (sounds
> > electrical) coming from what seems like the throttle
> > body when the car is at idle. It happens
intermittently
> > and is quite clear (although I can't see the part
that
> > is causing it). Is this a normal occurrence? Could
the
> > clicking lead me to the solution?
>
> nah, that's the carbon canister frequency valve
working properly.
>
> > I have cleaned the ISV and this has not helped my
> > problem. My next steps are replacing the temp. sender
> > and the O2 sensor. A quick question about the O2
> > sensor...will I be splicing the new one at the Cat.
> > of the line or at the engine connection end? I am
> > planning to use the Mustang V8 O2 sensor. Anything
else
> > I should know about the Sensor replacement procedure?
>
> you're gonna hate it.  as far as splicing, do it out
of the car.  remove
> old sensor.  unplug it.  bring inside.  splice new
sensor on, making the
> wires maybe slightly longer when you are done.  return
to car, install
> and plug it back in.
>
> > How likely is the temp. sender the culprit?
>
> it could be... have you checked the cap/rotor/plugs
condition?
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi/
>
> http://www.humanthoughts.org/