4kq intermittant rough/bouncing idle

[Huw Powell]

> First start of the day is fine, and if car has sat for
> 8+ hours it is fine.
>
> Starts within about 1-4 hrs of original start is where
> I see the problem.  Car starts easily, RPM drops to
> around 800 after a second or two, then seems to
> stumble, idle drops more to around 600 RPM, ISV
> adjusts and RPM shoots to 1300 or so for a second and
> then slowly drops back to around 800 where the
> stumbling re-occurs.  It never actually stalls out,
> and after a few cycles to 1300 RPM and back down
> everything settles out (30 sec or so)
>
> Hot starts within about 1 hr are fine.
>
> Recent cap, rotor, wires, plugs, air filter, fuel
> filter w/ no change.  Adjusted mixture with DPR
> harness (it was a little rich) w/ no change.  O2
> sensor bounces back and forth over 0.5V properly.
>
> My next educated guess is the ECU temp sensor.  Any
> other ideas?

ISV sticking when warm, maybe... but I doubt it.

When you say the mixture was "a little rich," what do you mean, exactly?

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/