Silicone will kill oxygen sensor [WD-40 OK] - Toyota RAV4 Forums
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#1 (permalink) Old 12-26-2006, 02:58 PM
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Silicone will kill oxygen sensor [WD-40 OK]

per article in POPULAR MECHANICS, July 1998 page 109, "silicone of any variety will contaminate/destroy the oxygen sensor, and the amount of silicone needed is minuscule" so don't use it before the firewall of any engine. The article is more extensive and surprized all my shade tree mechanic friends at work.
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#2 (permalink) Old 12-28-2006, 07:29 AM
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from http://www.mr2.com/TEXT/O2_Sensor.html

Quote:
What will damage my O2 sensor?

* Home or professional auto repairs that have used silicone gasket sealer that is not specifically labeled "Oxygen sensor safe", "Sensor safe", or something similar, if used in an area that is connected to the crankcase. This includes valve covers, oil pan, or nearly any other gasket or seal that controls engine oil.

* Leaded fuel will ruin the O2 sensor in a short time.
* If a car is running rich over a long period, the sensor may become plugged up or even destroyed.
* Undercoating, antifreeze or oil on the *outside* surface of the sensor can kill it.
Using silicone in the engine bay is OK - dont use it on the engine itself.... (Gaskets, etc...)

Keep on RAVin.....
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#3 (permalink) Old 12-28-2006, 08:15 PM
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To add to the first thread I posted the author states "He won't use silicone-based spray lubricants anywhere underhood or anywhere forward of the firewall". I showed the aritlce to a friend who is a top engine mechanic and he was aware of the problem and agrees with the author.
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#4 (permalink) Old 03-03-2007, 10:03 PM
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Since when does WD-40 contain silicone?

If you're concerned, just don't spray it near the air intake and you will be fine. Odds are the O2 sensor will wear out from something else first.

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Former 2001 Black Rav4 4WD w/ 5-speed manual, 172+ miles
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#5 (permalink) Old 03-04-2007, 11:00 AM
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Jeff is right WD-40 has NO SILICONE, it's stated right on can. Jeff , please as moderator remove the "no WD-40" from my topic post. I apologize to the people at WD-40.

[Mod Note: Edit made.]
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#6 (permalink) Old 03-04-2007, 12:11 PM
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Ruh-roh!

This page http://ralphb.net/RAV4FAQ.html#3.2.4 is often referred to for advice. On cleaning the throttle body it says:

Quote:
Subject: 3.2.4) Why is my gas pedal sticking?

Sometimes, the gas pedal of the RAV4 will feel like it's sticking, or
offering more resistance that usual. This problem may come and go,
but tends to become more pronounced and frequent over time. The
problem is most likely to be a dirty throttle body.

Cleaning the throttle body is not a difficult job, but your dealer may
charge a lot of money to do it for you. Here's a procedure for how
to do it yourself from Thomas A. Yurick <designer>:

"Try to park the car so that the drivers side is slightly downhill.
Open the hood and find the clamp that holds the big rubber air intake
hose to the throttle body (the big rectangular aluminum "box" that
sits on top of the engine). Loosen the clamp a few turns until you
can work the hose off. There isn't much clearance around the opening,
but if you're careful you can move it slightly off to the side.

Place an old towel under the opening, and using a flashlight if needed,
spray carb cleaner like Gumout
<http>
all around the butterfly valve and the related linkage. You'll be amazed
at the crud that will run out. Have someone work the gas pedal back and
forth a few times while you spray until it seems to be clean. Allow a
few minutes to dry and *lightly* spray a pure silicone oil on the point
on the inside that the linkage enters the throttle body
. Dispose of the
towel safely (it will be combustible) and replace the air intake hose
and tighten the clamp securely."
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#7 (permalink) Old 03-04-2007, 12:16 PM
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See post Slick Willie's revenge
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#8 (permalink) Old 03-04-2007, 05:18 PM
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Silicon damaging the oxygen sensors have been the main headline news earlier this week over here. Petrol forecourt(s) with silicon in the fuel have wrecked a few thousand cars that filled up with the stuff.

http://news.bbc.co.uk/1/hi/uk/6413357.stm
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#9 (permalink) Old 03-04-2007, 06:38 PM
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Quote:
Originally Posted by Sig228

Quote:
Subject: 3.2.4) Why is my gas pedal sticking?

Sometimes, the gas pedal of the RAV4 will feel like it's sticking, or
offering more resistance that usual. This problem may come and go,
but tends to become more pronounced and frequent over time. The
problem is most likely to be a dirty throttle body.

Cleaning the throttle body is not a difficult job, but your dealer may
charge a lot of money to do it for you. Here's a procedure for how
to do it yourself from Thomas A. Yurick <designer>:

"Try to park the car so that the drivers side is slightly downhill.
Open the hood and find the clamp that holds the big rubber air intake
hose to the throttle body (the big rectangular aluminum "box" that
sits on top of the engine). Loosen the clamp a few turns until you
can work the hose off. There isn't much clearance around the opening,
but if you're careful you can move it slightly off to the side.

Place an old towel under the opening, and using a flashlight if needed,
spray carb cleaner like Gumout
<http>
all around the butterfly valve and the related linkage. You'll be amazed
at the crud that will run out. Have someone work the gas pedal back and
forth a few times while you spray until it seems to be clean. Allow a
few minutes to dry and *lightly* spray a pure silicone oil on the point
on the inside that the linkage enters the throttle body
. Dispose of the
towel safely (it will be combustible) and replace the air intake hose
and tighten the clamp securely."
Doesn't apply to the 4.3 RAV's as they have fuel injection and no throttle cable to worry about (Throttle by wire not cable)

Wonder what after combustion gases from WD40 would wipe out the oxygen sensor in the exhaust pipe??

WD40 or any solvent/oil would probably damage the MAP sensor in the air intake system.
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