O2 sensor and rich condition

[Walter Petermann]

Hey Roger,
the O2 will not sense gasoline. A rich misfire will be read as a lean
condition due to excess O2. So the answer to your question probably not,
unless you have some cylinders misfiring and some just very rich but not 
misfiring.Then the O2 response would be jumping around all over the place. 
You might get an average high reading (with a voltmeter) if one cylinder 
is misfiring rich and the rest are just running rich. The best tool to see 
that would be scope.

That bring's up something I hadn't thought of before. If the system
is running rich enough to cause misfire, O2 feedback would actually
make things worse?

 Walter
 


Roger Heflin wrote:
> 
> Hey,
> 
> Would it be possible for too much gas going out the exhaust to
> cause the O2 sensors to read high (950mv+) even though there
> was plenty of O2 there (miss condition)?   I am trying to
> interpret my O2 readings and things aren't quite looking right.
> 
>                         Roger