within  a fairly narrow range I think.
our era vans use narrow range 02 sensors, I believe.
more modern cars have wide-range 02 sensors.

I don't think our 02 / ECU systems can compensate for large changes in
mixture ..
only fine tuning on the basic mixture .

they run wonderfully without an oxygen sensor anyway,  and the 02's
limited influence is why our vanagons can run so well without a working
02 sensor.

On 5/15/2012 11:06 PM, David Beierl wrote:
> At 12:54 AM 5/16/2012, Don Hanson wrote:
>>    I surmise it has to do with the injector spray pattern, but there
>> could
>> have been something else happening too.   We had no way to control the
>
> It will cause the injectors to deliver fuel faster than the ECU
> thinks they are doing, thus causing a richer mixture.  If the ECI is
> running closed-loop (listening to the oxygen sensor in the exhaust)
> it will dial back the pulse time until the mixture is correct again.
>
> Yours,
> David
>