idle drops to 400rpm and eventually stalls

cjcasati at cjcasati at
Mon Sep 17 12:03:57 EDT 2001

Hi all,

my 86 5KTQ held up fine on the trip to DC to pick up a friend who was stuck
in Newfoundland since Tuesday. But it developed a weird symptom just before
the trip:

- Pulling up to a light after driving some time the idle drops to 400 rpm
(normally idles at 900) and the engine eventually stalls.
- while this low idling occurs (before the engine stalls) I can cut off the
ignition and restart (no hesitation) and it idles normally.
- I can also adjust the idle by stepping on the gas pedal
- car performs absolutely normal otherwise
- Idle problem is intermitent, may not appear for a while
- problem sometimes appears immediately after hard acceleration

The archives hint at a problem with the CIS or the ISV. I had to clean the
ISV a while back because it was idling high with a pulsating jump between
two rpm speeds.

Vacuums appear fine on the engine, car has 167K.

Thank you to everyone as always!

Christoph Casati
Casati Interactive LLC

More information about the quattro mailing list