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Thread: 87 Honda Prelude What is the name of this emissions part?

  1. #1
    DX User
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    Apr 2020
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    1987 Honda Prelude
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    Orange County, California
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    87 Honda Prelude What is the name of this emissions part?

    Hello!

    This is my first post so here we go!

    I have a 1987 Honda Prelude 1.8L dual carb and I am looking for the name of the part that is vacuum line hooks up to. I believe it is a nippodenso part, but it has no label. Also, I was stopped at a stop sign and my idle dropped and the car stalled. It would not start again until I covered the vacuum line and then it idled fine. Could this part be causing an idle issue? I have a picture of the part and highlighted it (it is taped up). I also took a picture of the vacuum diagram and highlight the part I think it is as well.
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  2. #2
    DX User
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    Apr 2020
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    1987 Honda Prelude
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    Orange County, California
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    13

    Re: 87 Honda Prelude What is the name of this emissions part?

    After looking at another thread, I believe the vacuum line that hooks up to this part also hooks up to the igniter module if that helps identify the part more easily.

  3. #3
    DX User
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    Apr 2020
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    1987 Honda Prelude
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    Orange County, California
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    Re: 87 Honda Prelude What is the name of this emissions part?

    After looking at my picture more thoroughly, I think that part is labeled as air control valve B. Would that be correct and causing my issue?
    Last edited by Pr8lude18; 05-07-2020 at 07:30 PM.

  4. #4
    DX User
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    Jan 2019
    Vehicle
    84 Honda Prelude
    Location
    Washington
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    26

    Re: 87 Honda Prelude What is the name of this emissions part?

    The part you circled in the engine bay is the anti afterburn valve. Unfortunately if its not working you wont be able to get a new one. The car will run without it but since I see you live in the worst state possible to have this car I don't know if it will pass emissions. lol.

  5. #5
    DX User
    Join Date
    Apr 2020
    Vehicle
    1987 Honda Prelude
    Location
    Orange County, California
    Posts
    13

    Re: 87 Honda Prelude What is the name of this emissions part?

    Thank you for ID'ing it! Yes, California is terrible for owning cars 75 and after especially if they are older ones with issues passing smog. I think the part is working but a piece of it broke that fits into the hose. My dad used JB weld to hopefully hold it in place.

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