1990 V8 Quattro Idle Problem too

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <1997Nov14.130757.1772.22027@w12-mmta.radio.bbc.co.uk> paul.heneghan@bbc.co.uk (Paul Heneghan) writes:

> The first step in fault finding is this:
> When you've got the car running, and warmed up, try unplugging the 
> electrical connection to the ISV.  If the revs do not change, then ISV is 
> not doing its job.

The idle stabilisation controllers I've looked at all share one feature - once 
the ISV is unplugged, the ignition needs to be turned off and on again before 
the controller will talk to the ISV again.  One of the side effects of this is 
that even a very infrequent intermittent break in the wiring will cause the ISV 
to malfunction frequently.

-- 
 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club