Idle Hunting - '87 5kcstqw

[Kneale Brownson]

Maybe it's the ECU telling you to use the brakes? :~)


At 12:26 PM 10/12/2001 -0400, Swann, Benjamin R.  (BSWANN) wrote:

>Sounds like a similar problem as what mine is doing.  Car will buck when it
>gets in the idle range..kindof like you are giving it the gas then letting
>off abruptly, over and over..Annoying to say the least.
>
>BTW - no codes when I checked.
>
>[[From: George Harris <harchris at smokesignal.net>
>Subject: 5000CD TQ - Surging in 2nd
>
>Car is running well. Pulls strong in any gear. Smooth. Until I gear down
>into second and try to decelerate just using the engine compression. The
>car surges and bucks. Most prevalent in 2nd. If I just give a bit of gas
>it smoothes right out, but I want to slow down smoothly in traffic. Does
>anyone know where to start?
>
>Cheers
>George]
>
> > I'm sorting out issues with the new to me 5000 Turbo Quattro Avant.  This
> > problem cropped up while I was driving it back from Georgia to MD.  The
> > car began surging while I was driving it and slowed to speeds under 50
> > MPH.
> >
> > I am trying to isolate culprit - engine is hunting for idle, revving to
> > about 1500RPM then dropping down to around 700 repeating about 1/sec.
> >
> > I checked the throttle screw ( this had caused similar problem before with
> > my other '87 5kcstqw), the o-ring looked good.
> >
> > I haven't found vacuem leaks - yet.
> >
> > I disconnected the ISV connector - no change.  I forgot what is supposed
> > to happen.  I may resort to cleaning it, but dont think this is the
> > problem.
> >
> > I'll be checking the throttle switch next.
> >
> > Looking for other ideas and clues.
> >
> > TIA
> >
> > Ben]