hunting idle on 5ktq
human747 at attbi.com
Thu Sep 5 15:40:04 EDT 2002
> I have a problem, the idle speed rapidly varies from 1200 - 1400 rpm and
> repeats about 1 time per second on my 1987 5ktq.
> The car drives great once gas is pressed, but when idle switch closes the
> problem persists. Anyone have ideas about this? The thing that baffles me
> most is that unhooking the ISV does not settle the idle down, which
> eliminates the control relay and wiring in my thoughts.
If unplugging the ISV changes nothing, then the ISV system is not doing
its job, I think. Is there a test point on the 5kt to measure the ISV
duty cycle? Examine the ECU grounds, which should be somewhere on the
intake manifold, as well.
More information about the quattro