Simple 02 sensor question
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From: Po-Dunk Looziana
Simple 02 sensor question
Is it OK to put some dielectric grease on the 02 connectors where they connect to the wiring harness? I thought I remember reading about the 02 sensors "breathing" or something of that nature through the wires............any input?
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From: Po-Dunk Looziana
RE: Simple 02 sensor question
Just got a call back from Bosch Tech Support and they advise AGAINST putting any dielectric grease or ANY agent in the connections![&:][&:] He stated doing so could affect the 02 sensor and possibly shorten the life of it.
Great, I've got a GLOB of dielectric grease I need to remove from both connections........this ought to be a fun, clean job.
[&o]
Great, I've got a GLOB of dielectric grease I need to remove from both connections........this ought to be a fun, clean job.
[&o]
Road Master
Joined: Dec 2006
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From: Omaha Nebraska
RE: Simple 02 sensor question
I do not see how putting dielectric grease in the connections, inches away fromthe sensor,could affect the "breathing" of an O2 but maybe it could have a negativeeffect of the electrical conductivity ofthe pins in the connector, the sensor's signal is very low current. Sounds to melike Bosch wants a metal to metal contact of the pins in the connector and when dealing with millivoltsandmicroamps, any grease in between could alter the signal.
Road Master
Joined: Mar 2007
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RE: Simple 02 sensor question
That breathing thing is up close to the header as many o2s have to see fresh air are a referance. Some have a small hole that lets air in. It may be around the wires on some. I never really looked for the hole. This is a big deal on the wide band o2s.
AW
AW
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From: Po-Dunk Looziana
RE: Simple 02 sensor question
ORIGINAL: geargrinder
I do not see how putting dielectric grease in the connections, inches away fromthe sensor,could affect the "breathing" of an O2 but maybe it could have a negativeeffect of the electrical conductivity ofthe pins in the connector, the sensor's signal is very low current. Sounds to melike Bosch wants a metal to metal contact of the pins in the connector and when dealing with millivoltsandmicroamps, any grease in between could alter the signal.
I do not see how putting dielectric grease in the connections, inches away fromthe sensor,could affect the "breathing" of an O2 but maybe it could have a negativeeffect of the electrical conductivity ofthe pins in the connector, the sensor's signal is very low current. Sounds to melike Bosch wants a metal to metal contact of the pins in the connector and when dealing with millivoltsandmicroamps, any grease in between could alter the signal.
HERE isa pic of the splicing of the wires, but even this doesnt give a hint of not using grease. I wish I could remember where I read this.[&o]
Road Master
Joined: Dec 2006
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From: Omaha Nebraska
RE: Simple 02 sensor question
By "breathing thru the wires", I think that means where the wires physically go into the O2 sensor. Notice that that area is not sealed and any O2s that I am familiar with depend on this for sampling and comparing the outside air's oxygen contentto the exhaust's oxygen content. However, if Bosch says that modifying the wireing elsewherealters this breathing, who am I to question them? I like to learn something new every day.
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From: Po-Dunk Looziana
RE: Simple 02 sensor question
Thanks GG,
I found where I read what is in question:
It's hard to believe, but the tiny amount of space between the insulation/wire and through wire insulation provides enough air to seep into the sensor (for this reason, grease should never be used on O2 sensor leads/connectors because it can block the flow of air). Venting the sensor through the wires rather than with a hole in the body reduces the risk of dirt or water contamination that could foul the sensor from the inside and cause it to eventually fail.
A special thanks to Kristian Heidenfors for all his help and research on the HD Bosch O2 sensor, testing the voltage divider circuit and additional help on SE Race Tuner..
Found here in the special notes portion of the article: http://www.nightrider.com/biketech/h...olt_divide.htm
Beats the heck outta me. Guess I better get the LectraClean⢠out and clean the connectors I filled with dielectric.
I found where I read what is in question:
It's hard to believe, but the tiny amount of space between the insulation/wire and through wire insulation provides enough air to seep into the sensor (for this reason, grease should never be used on O2 sensor leads/connectors because it can block the flow of air). Venting the sensor through the wires rather than with a hole in the body reduces the risk of dirt or water contamination that could foul the sensor from the inside and cause it to eventually fail.
A special thanks to Kristian Heidenfors for all his help and research on the HD Bosch O2 sensor, testing the voltage divider circuit and additional help on SE Race Tuner..
Found here in the special notes portion of the article: http://www.nightrider.com/biketech/h...olt_divide.htm
Beats the heck outta me. Guess I better get the LectraClean⢠out and clean the connectors I filled with dielectric.
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