Re: 0xygen Sensor....HELP

["John H. Graham" <jgraham1@erols.com>]

Orin Eman wrote:
> 
> > The Black is the one.
> > As the engine idled (hot) I get readings from less than 100mv to 750mv.
> > (moves between these 2 readings as it idles.)
> 
> Normal.
> 
> > Introduced Propane into intake air chamber with no rise of voltage readings,
> > didn't cahange at all.
> 
> Also normal.  The ECU is controlling the mixture between these limits.
> 
> > Opened up a vacum leak with same results, voltage went from 100mv to 750mv
> > even with a vacum leak hissing away.
> 
> > I heard that you can pull out the sensor & heat it up with a propane torch &
> > this may fix it.
> 
> It's working.  It might be old and tired, but it's working.
> 
> You could disconnect the sensor and measure its voltage disconnected,
> then add the propane/create a vacuum leak.  Then you should see
> something.  With the sensor still connected, the ECU will fight you
> every step!
> 
> Orin.

It may be better to put the ECU in open loop mode.
That way you can check idle and co with the o2 sensor.

John
1990 QC