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 Short life on O2 sensors 
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Joined: Mon Apr 08, 2013 10:21 pm
Posts: 122
Any suggestions on the cause of short life on O2 sensors? The last couple of years I only get 4-6 months out of them. I use an LM-1 datalogger coupled with an Aux Box and Bosch sensors. They're mounted a few inches past the collector flange in the 3 o'clock position. Both the positive and ground wires of the datalogger run directly to my trunk mounted battery. I power the sensor at startup to avoid moisture shocking the sensor. When the sensors start flaking out I can get a little more life out of them by doing an open air heater calibration, but they don't last much longer after that. Unleaded fuel. Clean, lean, low load throttle calibration on the carb. I've heard pulling the sensor out of the direct stream may help, but also heard this will slow the readings? It's frustrating because the datalogger and Logworks software are great tools. But the sensors seem to flake out at the worst time, not to mention the cost. Any suggestions?


Mon Apr 22, 2013 6:33 pm
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Joined: Sat Feb 09, 2013 10:46 pm
Posts: 247
Burn the ends with a propane torch. The metal is thin so all you want to do is get them cherry red for a while. Let cool and reinstall with calibration. Klaus told me that at PRI once. I can do this twice before they quit for good.

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Mon Apr 22, 2013 10:27 pm
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Joined: Wed Feb 27, 2013 7:15 pm
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What is the first sign they are giving up?


Mon Apr 22, 2013 10:47 pm
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Joined: Mon Apr 08, 2013 10:21 pm
Posts: 122
Booster wrote:
Burn the ends with a propane torch. The metal is thin so all you want to do is get them cherry red for a while. Let cool and reinstall with calibration. Klaus told me that at PRI once. I can do this twice before they quit for good.


It's worth a try. Thanks


Mon Apr 22, 2013 11:46 pm
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Joined: Mon Apr 08, 2013 10:21 pm
Posts: 122
Hienergy557 wrote:
What is the first sign they are giving up?


AFR readout starts oscillating wildly and won't stabilize.


Mon Apr 22, 2013 11:47 pm
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Joined: Thu Mar 28, 2013 6:09 am
Posts: 726
Rich idle will kill them quicker also......3 circuit issue..


Tue Apr 23, 2013 6:00 am
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Joined: Mon Apr 08, 2013 10:21 pm
Posts: 122
Yeah I wish it were something as simple as rich idle or cruise as that would be easily fixed. This engine idles around 13.5 and AFR gradually leans at part throttle and eventually ends up around 15 at cruise. Plugs are always clean as well.


Tue Apr 23, 2013 12:52 pm
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Joined: Thu Mar 28, 2013 6:09 am
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13.5 is rich at idle...


Tue Apr 23, 2013 4:40 pm
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Joined: Mon Apr 08, 2013 10:21 pm
Posts: 122
AFR can be misleading at idle, especially if you have an appreciable amount of valve overlap. Smoothness, manifold vacuum, and plug readings have the final word for idle.


Wed Apr 24, 2013 6:58 am
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Joined: Thu Mar 28, 2013 6:09 am
Posts: 726
So are you saying no matter how much fuel you remove from the Idle it still will idle at 13.5???


Wed Apr 24, 2013 12:42 pm
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