Tracy Crook wrote:

In view of the discussion on the subject I should give some more detail on
my comment that 100LL "messed up" my O2 sensor.

The actual change was that responce was very slow from the sensor, even
noticible by me (a human).   An automotive ECU would assume it had gone bad
because most of them expect lean / rich transitions something like 5 times a
second.

It did look to me like the reading on my mixture monitor would eventually
get to the correct reading so this could be the reason the guys Mike talked
about saw no change.   I noticed the slow down in responce after a
cumulative total of about 110 hours on 100LL.   Recovery took about 25 hours
on unleaded.   I have about 250 hours on my first O2 sensor and still using
it.

Tracy Crook      rws@altavista.net
Web site:   http://www.rotaryaviation.com

State of the art info Tracy. Thanks.

Paul Lamar
 
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