RE: [Tech]: O2 sensors

["Bill Collins" <photo@intrex.net>]

The CIS system will go to a defined state with the oxy sensor disconnected.  I would have to check Bently to be sure, but I think its 45% duty cycle on the frequency valve, while shorting the leads to the temp sensor (simulating cold temps) gives 55%.

Bill

---------- Original Message ----------------------------------
From: "Jonas Karlsson" <jonas85k@hotmail.com>
Date: Mon, 04 Dec 2000 12:56:48 -0800

>>From: Randy Block <RandyB@E-Risk.com>
>
>>What if you are running the early (1981-US/CA) CIS system and you have the 
>>Oxygen sensor but removed the Cat.
>>
>>Question is:
>>Can/Should I disconnect the O2 sensor from the system and just run the
>>signal wire to my air/fuel mixture gauge?
>
>I'd leave it connected. The FI system was designed for it to be getting 
>readings from the O2 sensor. I'm not sure what the frequency valve would be 
>doing (i.e. what duty cycle) but I don't think it would be at 50%. 
>(opportunity for a neat experiment) So your mixture would be off. If you 
>wanted to run without an O2 sensor, swap in a fuel distributor from a 
>_really_ early car (one that didn't have a frequency valve) but that is a 
>pain and won't give any gains.
>
>I think that the reason european cars without cats also did not have O2 
>sensors is because they were not very concerned with emissions in those cars 
>(consequently they now need to pay astronomical taxes on those vehicles)
>
>We all know that a well tuned and properly functioning Scirocco will pass 
>emisions (barely) without a cat. This is because the O2 sensor is 
>continuously getting the air/fuel mixture in the stochiometric range, which 
>by itself produces _fairly_ clean exhaust. But if it is off at all, then 
>emissions go through the roof.
>
>HTH,
>Jonas
>
>
>
>
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