Question about 1990 Mitsubishi Galant

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Stuck O2 Sensor

Have a 1990 Gallant GSX that has a "Welded-In" (actually heavy carbon Build-up) and it won't Turn, to take it out, to replace.
HOW? do I get it out without damaging the Threads?
the Car has already been in the Shop twice, and BOTH shops won't do what it takes to get it out, since they are worried that the whole Manifold will have to come off the repair the damaged threads....Got to be another Solution??

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  • Rick Wymer
    Rick Wymer Jan 18, 2009

    I thought of that Myself, but since 2 Repair Shops wouldn't attempt it, made me rather it is my G/F's Car, and If I broke it I would never hear the end of it, lol...
    I was thinking of Using some "Heat" to expand the Metal around the O2 Sensor, then Using my Impact to Remove the Stuck Sensor (which is practically Junk anyways)...also tried WD-40 and a couple of good Raps, but that didn't budge it...

  • Rick Wymer
    Rick Wymer Jan 18, 2009

    Yes, Examined it thoroughly and it isn't welded...

  • Rick Wymer
    Rick Wymer Mar 08, 2009

    No, It's NOT Welded-In, and Using a Oxy/Acet. Torch to Heat it up is My Next Step(Plus Using My Air Impact as a Removal Tool while the surrounding Manifold is HOT, lol)

    In My Experience WD40 will evaporate at Normal Operating Temperature on a Exhaust Manifold, But I have Repeatedly Soaked the Area with WD40 Before hand, and Applied Vibration to try and help Loosen up the Corrosion/Carbon...
    I have found that a Deep-Well 6-Point Socket works Better than a Sensor Socket which has a Tendancy to Round off the Nut on the Sensor...
    I "see" that your a Newbie on Here, so I will give you a Decent Rating, even Though Your "solution" is something I Tried Long Before I made the Original Post.
    By Trade, I am a Heavy-Duty Diesel Mechanic, I was Just seeing If another Wrench Had a Different approach to this Problem.

  • Roberta Smith
    Roberta Smith May 11, 2010

    have you examine it carefully to make sure it wasn't welded in ?

  • Roberta Smith
    Roberta Smith May 11, 2010

    have you tried a welding torch to heat it first ?



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Try cranking the car and letting it get to normal operating temp. then spray it with wd-40 if you have a sensor removal socket try to take out the sensor. good luck

Posted on Mar 06, 2009


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