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Author Message   Will547_us Posted on Wednesday, November 04, 2009 - 08:41 pm:        I had my TPS reset after installing a Drummer SS and the race ECM. When I was waiting for my ticket to generate the tech who'd done the work said not to use silicone on header/muffler connections as the silicone "attacks the porcelain" on the O2 sensor. When I told him my stock muffler was sealed with the orange sealant he told me the factory used copper base silicone. He also told me the pipes were assembled at the factory with the copper base silicone and allowed to cure for 24 hours while venting before they were installed. Has anyone else had issues with silicone and O2 sensors or heard of copper base silicone?   Ulyscol Posted on Wednesday, November 04, 2009 - 09:31 pm:        Just use sensor safe RTV. It is available at any autoparts store. I believe it will say right on the package "safe for o2 sensors." http://www.permatex.com/products/Automotive/automotive_gasketing/gasket_makers/auto_Permatex_Sensor-Safe_High-Temp_RTV_Silicone_Gasket.htm (Message edited by ulyscol on November 04, 2009)   Pkforbes87 Posted on Wednesday, November 04, 2009 - 09:35 pm:        If the silicone was used "downwind" of the O2 sensor, then it wouldn't matter. I've used mega copper for just about any kind of sealing needed, and never had issues. I don't think it's O2 sensor safe. Maybe I just got lucky   Ratbuell Posted on Wednesday, November 04, 2009 - 09:38 pm:        I think the ultra copper is the "copper based" sealer the tech was talking about. Yes, RTV can be bad for sensors. Yes, you should use "sensor safe" stuff. No...it doesn't matter as much downstream of the sensor. Just remember though - if it's not fully cured and you turn the bike off, vapors can (and will) travel UPstream.   Will547_us Posted on Thursday, November 05, 2009 - 08:24 am:        Thanks guys, live and learn! I've never heard of sensor safe silicone and didn't realize it if I ever saw it. I hope the "downwind" supposition is valid, I would tend to agree. Cheers, Will   Natexlh1000 Posted on Thursday, November 05, 2009 - 10:27 am:        It's not the ceramic that's attacked. It's the tip where all the magic happens. The chemical coating is sensitive to being contaminated. http://en.wikipedia.org/wiki/Oxygen_sensor Pretty sweet little tech-toy that we can take for granted.

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