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  1. #1
    Super Poster moejeep's Avatar
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    O2 sensor removal & missfiring

    I have an 06 LJ.

    I have needed to put an O2 sensor for about a year now... (probably less then 2000km lol)
    What is the best way to remove the O2 sensor?
    Can I put some PB blaster or does that risk messing up the new O2 sensor?
    or should it be hot when I am removing?

    It is Bank 2 Sensor 2 so it is not that bad to get at, I don't have all my tools up here, but they are coming on Friday.

    Cyl 6 was misfiring, assuming partly form the O2 sensor, and part due to the fact I only remember changing the spark plugs once in 14 years.
    I have new spark plugs coming too. Also not sure how the gas is, I think I filled up once or twice this year.
    Morgan - Moejeep
    OF4WD - 5369
    1985 - CJ-7 - 31" tires - 4.0L
    2006 - LJ - 35" tires - Metal Cloak - ARB Lockers

  2. #2
    Content Team Drizit's Avatar
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    When I did mine I used a big open end winch, and tapped it with a hammer to start it. I don't think it was hot because I then unthreaded the sensor by hand. Don't know if you are aware but tjs hate Bosch sensors, basically if it's not NTK don't bother until you have those. Also sensor 2 can't cause a misfire as it doesn't do anything for the mixture, it's just to check cat preformance.

  3. #3
    Super Poster moejeep's Avatar
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    Quote Originally Posted by Drizit View Post
    When I did mine I used a big open end winch, and tapped it with a hammer to start it. I don't think it was hot because I then unthreaded the sensor by hand. Don't know if you are aware but tjs hate Bosch sensors, basically if it's not NTK don't bother until you have those. Also sensor 2 can't cause a misfire as it doesn't do anything for the mixture, it's just to check cat preformance.
    I have the NTK... it has been in the jeep since before last NL.

    I have a larger wrench coming....
    (I have stayed up north since March. )
    Morgan - Moejeep
    OF4WD - 5369
    1985 - CJ-7 - 31" tires - 4.0L
    2006 - LJ - 35" tires - Metal Cloak - ARB Lockers

  4. #4
    Content Team Drizit's Avatar
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    Quote Originally Posted by moejeep View Post
    I have the NTK... it has been in the jeep since before last NL.

    I have a larger wrench coming....
    (I have stayed up north since March. )
    Sounds like you will be all set.

  5. #5
    Super Poster moejeep's Avatar
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    16005212884126477344646591590622.jpg

    Well... Any ideas now?

    Can't get the o2 sensor off too...
    Morgan - Moejeep
    OF4WD - 5369
    1985 - CJ-7 - 31" tires - 4.0L
    2006 - LJ - 35" tires - Metal Cloak - ARB Lockers

  6. #6
    Content Team Drizit's Avatar
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    Quote Originally Posted by moejeep View Post
    16005212884126477344646591590622.jpg

    Well... Any ideas now?

    Can't get the o2 sensor off too...
    Are the wrench flats missing?

    02 sensor, run the engine for a bit once you get the plugs done and then try.

  7. #7
    Super Poster moejeep's Avatar
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    The wrench flats are out.
    It looks like the washer is rusted in there, there is ceramic, and the threads are stuck.

    Champion has some intructions I will try to follow.

    Can't find any PB blaster, going to try some seafoam penetrating liquid from the local store.
    Morgan - Moejeep
    OF4WD - 5369
    1985 - CJ-7 - 31" tires - 4.0L
    2006 - LJ - 35" tires - Metal Cloak - ARB Lockers

  8. #8
    Content Team Drizit's Avatar
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    Quote Originally Posted by moejeep View Post
    The wrench flats are out.
    It looks like the washer is rusted in there, there is ceramic, and the threads are stuck.

    Champion has some intructions I will try to follow.

    Can't find any PB blaster, going to try some seafoam penetrating liquid from the local store.
    An Acitone and atf mixture works as well.

  9. #9
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    that really sucks - misfire may be caused from cam sensor or crank sensor or a combo of both - maybe get a scan tool and check fault codes...best of luck

  10. #10
    Super Poster moejeep's Avatar
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    The only code was Cyl 6 misfire and O2.

    Spark plug out, I have not had the time/light to do anything else but I am off work tomorrow.
    I will try to get the new plugs in the try the O2 sensor agian.
    Morgan - Moejeep
    OF4WD - 5369
    1985 - CJ-7 - 31" tires - 4.0L
    2006 - LJ - 35" tires - Metal Cloak - ARB Lockers

 

 

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