gutted cat for dinner

[Burl Vibert]

Chris Dyer wrote:

> So, for fuh-evuh I've had an un-diagnosable, intermittant high idle problem
> on my '87 5kcstq. Many an audi wrench couldn't figure it out.
>
> Latest guy is thinking bad cat. It does make a tinny-vibration noise
> sometimes (I assumed it was just a bad hanger or something). It kinda makes
> sense; bad cat sends bad info to O2, the confusion begins.

That diagnosis seems a bit out to lunch to me.  I've only ever seen cats plug
up, if that happened you would see a huge loss of power at high rpm, probably
not an idle problem.  Also I can't see how it would be intermittent.
How high is your high idle?

Burl Vibert
1987 5000CSTQ
1983 Coupe (anyone have a spare tranny?)
Kingston, Ontario