O2 Sensor
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5.0 and 5.7 Discussion, O2 Sensor in Cadillac Engine Technical Discussion; Is the O2 sensor in my 350 TBI factory welded in place? I'm trying to replace it per instruction from ...
  1. #1
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
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    O2 Sensor

    Is the O2 sensor in my 350 TBI factory welded in place? I'm trying to replace it per instruction from my service manual but I can't budge the damn thing. Thanks,

    Brian

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  3. #2
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: O2 Sensor

    They're tough to get loose. I just did mine on my 93 FWB. 2 days of spraying with penitrating oil. Do you have to O2 Sensor socket? It helps to get one if you don't.

    They are 3/8 drive but have a 1" nut like thing on the top so you can throw a 1" socket on a 1/2 drive ratchet and pull like hell. It took 2 people on the ratchet to get mine loose.

  4. #3
    90Brougham350's Avatar
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    Re: O2 Sensor

    Hmmm, I don't believe mine is 1 inch, 13/16th is just too small and 7/8th is just too large, and that little bastard sure looks like it's welded on there, but I'll try and put a socket on it tonight. Thanks,

    Brian

  5. #4
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: O2 Sensor

    I think you miss understood. The O2 sensor is 7/8. There is a special socket to remove these things. They look like a deep well impact with a slot on the side for the wire.

    On top of that special socket is a 1" nut. So you have the option of using a 1" wrench or a 3/8 drive ratchet. What I had to do was use a 1" socket on a 1/2 drive ratchet.

    Unless there is a lot of clearance you'll never get this out without that special socket. Sears has them for $10

  6. #5
    N0DIH's Avatar
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    Re: O2 Sensor

    If you are dead set at getting it out, and are for sure replacing it, just cut the wire and use a std stocket (6 point, never use a 12 point on a 6 point hex). But honestly, few sensors are actually bad, a majority of them last a lifetime of the vehicle assuming it is kept in good tune and nothing poisons the sensor.

    My 85 Cutlass I could use a box end wrench! It was in a great place, the socket was harder to use! Love that 1980 manifold off of a 260 Olds that I found. Who says 260's are worthless??!?!

  7. #6
    FRANKO is offline Cadillac Owners Fanatic
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    Re: O2 Sensor

    YOU GUYS!!! You have to remove the sensor HOT!!!

    FRANKO

  8. #7
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: O2 Sensor

    Good point!! I think I have, but it was coincidence that it was hot!

  9. #8
    The Ape Man's Avatar
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    Re: O2 Sensor

    Sometimes the sensor and area around it needs to be heated. Plumbing propane torches work well for this. If you get it to turn and then it locks up again wait for everything to cool and spray some WD-40 or similar into the gap where the threads are. Then screw it back IN. It should spin out after repeating this a few times. Beats tearing the threads out of the pipe.

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