Idle went haywire last night, possibly the o2?

[Huw Powell]

On 12/3/2010 4:27 PM, Johnny B wrote:
>
> 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).

People use that static adjustment to compensate for many things that 
should be fixed, eventually it doesn't work any more, and they've also 
moved the static mixture far from baseline in the process.

Replace that idle switch first.

> 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!
>>> _______________________________________________ quattro mailing
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>>>
>>
>> -- Huw Powell
>>
>> http://www.humanspeakers.com/audi
>>
>> http://www.humanthoughts.org/
>> _______________________________________________ quattro mailing
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>  _______________________________________________ quattro mailing
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>

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/