On Tue, Jul 20, 2010 at 5:20 PM, David Beierl <dbeierl@attglobal.net> wrote:

> At 08:06 PM 7/20/2010 Tuesday, Loren Busch wrote:
>
>> One more thing.  When, for a couple of days on a four years ago, I had to
>> drive with the O2 sensor disconnected, I got about 13-14 mpg on that tank.
>> Not saying a bad O2 sensor just that that is what I got with the O2 sensor
>> unplugged.
>>
>
> If your mileage drops with the sensor disconnected, there's something wrong
> with the mixture that the sensor has been compensating for...
>

That was a special case where I had an injector go bad, running very rich.
Disconnecting the O2 sensor made all the injectors do essentially the same
thing.  So I got smoother running but hogged gas real bad.  Replaced the
injector (and the O2 sensor for good measure) and everything was fine.