O2 sensor

[Hayes Myers]

I haven't. I’m guilty. But am getting ready for full bore mission to fix
naggling issues.  Finally did timing belt.. now I'm a little less 'afraid'
of the systems.  I have some great help from Andrew and Steve and Frank as
of late... it's now a matter of cleaning up what appears to be fuel injector
gremlin and perhaps a leak.  I'm an ELec Engineer...yet didn't get codes to
blink from my 200...so that is real high on agenda for today!   

I’m off to swap some parts and see about a clutch bleed.

Cheers!

-----Original Message-----
From: Brett Dikeman [mailto:brett.dikeman at gmail.com] 
Sent: Saturday, November 28, 2009 12:10 PM
To: Hayes Myers
Cc: George; theringmeister at triad.rr.com; quattro at audifans.com
Subject: Re: O2 sensor

On Sat, Nov 28, 2009 at 8:33 AM, Hayes Myers <hayesmyers at gmail.com> wrote:

> Good point on o2 replacement.  Car history: I bought ~1year/25000km ago
> ...afer it apparently sat ~4 years. (car has ~270km now).  My ISV was
> cycling like crazy before I disconnected it ~5 months ago or more.  I did
> some checking then and several folks (audiworld) had changed theirs and
> solved the cycling isv  (well..engine was cycling up and down rapidly at
> idle...).

I'm 90% sure the above has nothing to do with the O2 sensor on a CIS car.

Among other things, if it does the idle ping-pong immediately (ie,
before the O2 sensor has warmed up), it's *definitely* not the O2
sensor.

If it has 60k+ since the last O2 sensor change, yes, it'll help with
mileage and emissions, but it won't solve the idle problems.

I assume you've checked operation of the ISV?  Have you run all the
CIS output diagnostics?

HTH,
Brett