MC CIS oxygen sensor question

[Cody Forbes]

Trust me man I was really thinking "geez I should know this". Truth is that 
the white car is sorta the beater/backup car. All stock except QLCC. Of 
course the odometer quick in the last millennium, but estimates put this one 
as approaching 300,000 miles. CIS runs the car well overall, but it doesn't 
behave when warming up if it's less than 60 degrees out. I'm certain it's 
got a leaky injector or 5, the throttle body shaft is actually worn which is 
the source of the vacuum leak, and the warmup reg is questionable. It's been 
on daily status for the other half for a while now and I'm just starting to 
look at fixing some things it needs.

I've got a wideband tailpipe probe, I'll compare output from the O2 and the 
wideband and go from there. Or, more likely, I'll ignore it until summer.

Truth be told, I'm actually seriously considering that it might be time to 
move on from my 5000's. I started to write why and decided that needs a new 
thread started, so I shal start one...

-Cody

-----Original Message----- 
From: Huw Powell
Sent: Wednesday, December 21, 2011 2:20 AM
To: Cody Forbes
Cc: Quattro List
Subject: 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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-- 
Huw Powell

HUMAN Speakers
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