--BeyondBoundary_2_Mon_Feb_23_11:11:44_1998__4823
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> One further note - literature says that the sensor appears to last only for a
> short time with leaded fuel! ie approximately 2-3 hours before contamination
> wrecks it.
>>What literature? Do you have any references?
>>
>>Are you sure you are not confusing O2 sensors with catalytic converters
>> - which definitely *are* sensitive to lead?
>>
>>I know that the O2 sensor is very sensitive to silicone - it seems they
>>may be affected by very liberal use of silicone gasket sealer.
>>
>>Egil
I'm just going on what I read in articles I found on the web. One person was a
racer who had used a load of these sensors and reckoned they only lasted a
couple of hours when exposed to exhaust from leaded fuel.(see
http://rclsgi.eng.ohio-state.edu/~orlin-s/sensor.html)
I was also sent some extracts from the Bosch Automotive Electrical/Electronic
Systems Handbook by a kind lister who sent me a spare sensor and this very
technical extract says,
"Presuming correct operating conditions, the heated lambda sensors in series
production today have service lives of over 100,000km. However, in order to
avoid damaging the active outer platinum electrode the engine must be operated
with unleaded fuel".
>On 5 Feb 1998, Andrew Linkens wrote:
>
>> My solution to the problem is to add the heated sensor to a tailpipe
extender
>> and only use it for checking the tuning of the car from time to time.
>
>Four points:
>
>1. The distance from the extender outlet to the sensor needs to be very
>long so that no air reaches the sensor from the outlet.
>
>2. The seal between the tail pipe and your extender must be 100% air
>tight.
>
>3. The sensor must be mounted such that the body is exposed to fresh air
>at all times.
>
>4. As you note, you would need a heated sensor.
>
>I would imagine it was easier to just mount a standard unheated sensor
>permanently. One of the real cruxes of the O2 sensor is that it will give
>readings under all engine conditions, not just idle.
>
>Egil
>- --
Thanks, I take your points. I'd thought along similar lines as well but I guess
I can't see any point in a permanent O2 sensor if it's going to get trashed by
lead contamination after a short time. I'm really only going on the articles I
read so if anyone on the list has experience of using these sensors in the
presence of leaded exhaust gases I'd be really pleased to hear from you,
thanks
Andy
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