Fwd: Re: MC CIS oxygen sensor question

[Huw Powell]

Dammit stop leaving the group out!

-------- Original Message --------
Subject: Re: MC CIS oxygen sensor question
Date: Wed, 21 Dec 2011 03:03:03 -0500
From: Huw Powell <audi at humanspeakers.com>
Reply-To: audi at humanspeakers.com
To: urq <urq at pacbell.net>



On 12/21/2011 2:50 AM, urq wrote:
> ... don't know any MC engine which had a fuel thingie where you measure
> current ... those were on the NA engines from that period (CIS-E) ... the
> turbos have what they called an "OXS Frequency Valve" ... on the urq anyways
> ... may have been called something else on the 5kT.  The diagnostic method
> employed there is checking the duty cycle ... back when there was a SunPro
> CP7678 digital multimeter which had a duty cycle measuring mode ...

Yup.  I have that meter (or one like it)... but I thought the MC motors
used a bit of both?  I might be wrong, of course.  Duty cycle was
actually pretty old school for meters, since it is the same as "dwell"

> ... I'm amazed that I was able to remember the model number of the meter
> after so many years ...
>
> Steve Buchholz
>
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
> Behalf Of Huw Powell
> Sent: Tuesday, December 20, 2011 11:21 PM
> To: audifans
> Subject: Fwd: Re: MC CIS oxygen sensor question
>
>
>
>
> Funny to see you posting a question like this!
>
> measure OXS voltage output.  measure fuel thingie current at idle.
>
> measure lots of things.
>
> You know the drill, just remember it!
>
> On 12/21/2011 12:44 AM, Cody Forbes wrote:
>> Had my white 5ktq in the shop tonight for an oil change and check over. I
> decided to play with the fuel mix a bit as mileage has gone down recently
> (yes, I know it has a vacuum leak, the throttle body shaft seals leak when
> on the smoke machine). So I unhook the oxygen sensor, adjust the mix by ear
> and make a noticeable improvement in idle quality with about a quarter turn
> clockwise. Funny thing is though that when I plug in the oxygen sensor again
> the idle quality deteriorates. Is this expected or does it sound like oxygen
> sensor time? I know it's got at least 6 on it (my history with the car),
> likely many more than that.
>>
>> I'm so used to my black EFI 5ktq that I am forgetting all the CIS
> tidbits!!
>>
>> -Cody (mobile)
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