Idle went haywire last night, possibly the o2?

[Johnny B]

Hmm... well here's the thing, my idle switch has been bad for some time now awaiting replacement (now bumped up in priority) but the idle has remained pretty solid (using the static adjustment to compensate). Now after months of this, the sporadic idle creeps up on me. I'll be doing a thorough check of all vac lines again (ISV & X + all rubber lines have already been replaced, possibly something came loose) and will also inspect the wiring to the ISV. Maybe it's time for a good cleaning as well.. 

Thanks for the help!

Johnny
Pre95

> Date: Fri, 3 Dec 2010 13:52:00 -0500
> From: audi at humanspeakers.com
> To: pre95 at live.com
> Subject: Re: Idle went haywire last night, possibly the o2?
> CC: quattro at audifans.com
> 
> That could be a bad idle switch (or its wiring).  If the ECU doesn't 
> know your foot is off the throttle it won't try to regulate the RPMS and 
> they will usually cycle with the OXS.
> 
> The switch is on the bottom of the throttle body, IIRC, and shares a 
> connector and harness with the WOT sw. on top of the TB.
> 
> On 12/3/2010 12:37 PM, Johnny B wrote:
> >
> > So getting off the highway in my 84 4000q, I realize my idle is no longer stable, and is now varying between 800rpm and 1200 rpm (Up then down then up then down then up then down etc etc).. I also noticed a strong odor of fuel at idle that wasnt there before.. Im assuming my o2 bit the dust but wasnt sure if it'd give the idle adjustments on the JT like a dead o2 does on newer cars. insight appreciated!
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> -- 
> Huw Powell
> 
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