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O2 Sensor on 87 with tbi

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CJeepFreak84, Apr 17, 2003.

  1. CJeepFreak84

    CJeepFreak84 Registered Member

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    Any one know the location of the o2 sensor on 87 tbi? looked in hayes and ended up being burned by burning hot coolant by accidentally taking out the temp sensor? on the drivers side of block.... Thanks
     
  2. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    It's in the exuast manifold near where it joins the exhaust pipes.
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    Driver's side exhaust manifold. Points toward the back of the truck IIRC from working on the neighbor's '88.
     
  4. heavy4x4

    heavy4x4 1/2 ton status

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    Yup, and it's a b!tch to get at, let alone turn a wrench. /forums/images/graemlins/mad.gif

    CJeepFreak, yeah, that was the coolant temp sensor for the gauge that you took out.
     
  5. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Suggestion...SOAK, and I mean SOAK the thing with PB Blaster Catalyst before you try to take it off. Mine wouldn't budge till I soaked it for a day.
     
  6. CJeepFreak84

    CJeepFreak84 Registered Member

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    well at least i was on the right side of the engine /forums/images/graemlins/laugh.gif thanks for the advice... i know it was an easy question but that thing is really hidden in there!
     
  7. Itali83

    Itali83 1/2 ton status

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    I'd buy a spark plug tap(same thread as an O2 sensor). Every O2 sensor I've replaced I've taken most of the threads out with it and weren't able to start the new one, and since this one is in a bad spot (what O2 sensor isn't?) I'd buy the tap and it'll go much faster/easier.
    Ben 87 Jimmy + 89 Blazer
    /forums/images/graemlins/usaflag.gif
     
  8. bigtruck87

    bigtruck87 Registered Member

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    in a tight spot you say? i am a tech at a lincoln dealer and compared to a licoln nothing on my 87 blazer is in a tight spot.
     
  9. CJeepFreak84

    CJeepFreak84 Registered Member

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    well i'm leaving it in fornow.. i've got to get the valve seals cahnged ithink.. (burns oil) so i don't want all the oil fouling the new sensor...
     
  10. wadinator

    wadinator 1/2 ton status

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    /forums/images/graemlins/burb.gif
    It was a piece of cake to replace on my 87 burb. Turned right out, with a little liquid wrench, and mine had never been out before either.

    Why are ya replacing it anyways?

    It's easier to get at from under the truck than it is from above.
     
  11. CJeepFreak84

    CJeepFreak84 Registered Member

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    just basic tune-up... first one i've done on it... i'm going to wait till i get the valve seals changed anyway.. i don't want the new sensor getting all clogged with oil
     

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