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O2 Sensor - ECU Connection & Diaelectric 700

posted by  dnvolvo on  Tue Apr 26 13:43 CST 2005
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last visit: Wed Jun 16 03:19 CST 2010
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Is there reason not to use diaelectric grease (aka silicon) on the electrical connection from the Oxygen Sensor to the ECU? I've seen reference to not using Silicon near the O2 sensor -- cause it's not compatible with the sensor -- but how about on the under the hood connection? I found the green wire (ECU) connection to be oxidized -- cleaned it up with brass brush -- now seems prudent to put some diaelctric on it and then remake the connection to the O2 sensor.

Thanks!
--
dnvolvo '89 765T 200K - '91 245 100K








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    O2 Sensor - ECU Connection & Diaelectric 700

    posted by  Steve on  Tue Apr 26 14:30 CST 2005
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    last visit: Fri Oct 24 07:16 CST 2014
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    The O2 sensor produces voltages from 0.1 to 0.9 which would be severely affected by the resistance of the dielectric paste, unlike the 5V to 12V elsewhere. This is the ONE underhood connection you want to keep bare. The issue has nothing to do with silicone contamination of the sensor, which is a separate problem. To avoid the latter, don't spray anything in or around the intake system with silicone and use only silicone-safe RTVs on intake system parts.







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