CIS tuning

[Huw Powell]

The high idle is very likely due to unrepairable intake tract leaks.

My black car was drifting up over the years, and the grey one does the 
same thing, idling from about 900-1200 rpm depending on its mood. 
Doesn't affect operation at all.

I smoke tested it a year or two ago and it just came out all over the 
place - think things like worn throttle body butterfly shaft bushings. 
It also came out in the location of the big leak I was looking for ;)

- Huw

On 1/21/2016 10:32 PM, Cody Forbes wrote:
> All narrowband oxygen sensors, like the stock one in your car, operate in the 0-1v range so yes that will work.
>
> Essentially speaking, most of what you are doing is meaningless. You can't really change the fueling characteristics on this car.  You can verify things are or aren't working correctly, but there are other methods for that too.
>
> -Cody Forbes (mobile)
>
>> On Jan 21, 2016, at 6:40 PM, radek at uniserve.com wrote:
>>
>> Hello all surviving CIS fans :)
>>
>> I decided to finally tackle the high idle problem in my winter ride, an 88 90Q.  I borrowed a wide-band O2 gauge, showing actual air-to-fuel ratio.  For now, I just removed the existing O2 sensor, replaced with the gauge's sensor and fired up the car.  First, it was running very rich, until it warmed up.  Once warm, the mix would be around 14:1 at idle, but would get very lean at higher rpms, up to 17:1.
>>
>> Are these results meaningful at all, without O2 sensor connected?
>>
>> The gauge has an output wire that can simulate O2 output to the ECU, which can be set (in low-voltage mode) to between 0 - 1 V.  According to Huw's page, this is the range a regular O2 sensor operates on?  Just want to double check, wouldn't want to fry my ECU.
>> Thanks for any input and guidance,
>>
>> Radek.
>>
>>
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