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oxygen sensor replacement

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Michael Dobony

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Nov 26, 2009, 8:37:09 PM11/26/09
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I have a 99 k1500 suburban 5.7l gas engine. I am trying to replace the rear
oxygen sensors and started with the "easy" one behind the rear cat. It
would not budge. I used a propane torch to heat up the seat and managed
about 2 turns. Now it will not move and busted a wrench on it. Any ideas on
how to loosen it up to replace it?

Mike D.

Borked Psuedo Mailed

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Nov 26, 2009, 10:21:48 PM11/26/09
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More heat and some liquid or spray lube.

I don't think propane will get it hot enough. You need to heat the bung
it's in, not the sensor itself. Heat, lube, repeat.

Steve W.

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Nov 26, 2009, 10:23:49 PM11/26/09
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Spray some break free or Kroil on it. Then try turning it back in some.
I use a heavy duty flair nut wrench to break them loose. You could make
one by grinding a notch in a box end. It only has to be wide enough to
get the wires through.

--
Steve W.

Michael Dobony

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Nov 27, 2009, 9:53:21 AM11/27/09
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Propane was getting the bung red hot. I avoided the sensor.

Ray

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Nov 28, 2009, 8:16:52 AM11/28/09
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If you're going to be replacing the sensor, just cut the wires and use
a proper box-end wrench on it. A box-end that has been cut is not
strong enough, in my experience. And as was already suggested, turning
it in a bit before you continue out should help.

Ray

Martin Riddle

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Nov 28, 2009, 12:45:34 PM11/28/09
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"Ray" <ray...@gmail.com> wrote in message
news:004a60b2-3768-4649...@p8g2000yqb.googlegroups.com...


> If you're going to be replacing the sensor, just cut the wires and use
> a proper box-end wrench on it. A box-end that has been cut is not
> strong enough, in my experience. And as was already suggested, turning
> it in a bit before you continue out should help.
>
> Ray
>

Use lots of PBBlaster, let it soak. Then use the box end, and turn it
in then out, repeat until you get it going.
Sort of like pumping a old well.

Cheers


Michael Dobony

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Nov 29, 2009, 5:18:00 PM11/29/09
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Just got some. I miss the straw. Wasting a lot on the floorboards as I
attempt to aim the "pinpoint" stream at the sensor :( I'll soak them a few
days and see what happens.

Pete C.

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Dec 1, 2009, 9:57:54 AM12/1/09
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If you're removing it for replacement, just cut the wires off the sensor
and use a regular box wrench on it. You only need to get around the
wires if you plan to reuse the sensor.

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