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Thread: Thermo valve replacement

  1. #1
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    Thermo valve replacement

    Hey all, new here!

    Probably a stupid question but Iím new to Hondaís. I have an 88 Accord LX that I was given, the car is lime a time capsule itís so clean!

    Okay to the point, when you start the car cold the idle shoots up to 2500 rpm, after a moment if I jab the gas pedal it will drop to 1500rpm but no lower. So I started looking at the carb and found that the choke wonít disengage unless I hold the choke plate open and tap the throttle linkage, then it idles right down to 1000rpm. So I traced all vacuum lines that where involved with the choke, when I traced vacuum line #18 past the hard line section it went back to to soft line and down to some sort of what I imagine is a 3 way valve thatís screwed into the intake or block I couldnít quite tell. Anyhow that ďvalveĒ was snapped off the part that screws in. If anyone could tell me what thatís called so I can get a replacement and have a properly functioning choke, and what I imagine would be quite the vacuum leak fixed aswell haha I would forever in your debt!



  2. #2
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    Re: Have a quick question? Ask it here!

    Thermo valve replacement-c59a7fcf-99b5-467b-95ae-5b281f365539-jpeg

  3. #3
    Thermo valve replacement
    ShiRen's Avatar
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    Re: Have a quick question? Ask it here!

    Yikes. No way you will just find that thing, youll have to pull it off another car. I was about to offer to sell you mine but I just realized I pitched the rear half of my extra intake... I don't use that on my car, but if I take it out there will be a gaping hole.

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    Re: Have a quick question? Ask it here!

    Thanks ShiRen, after posting this last night I called a couple auto parts stores and tried to have them look up vacuum switches for the car with zero luck so I figured a wrecking yard might be my only option. Thankfully I know where a couple are. However I know one of them is a manual, will the switch be the same or do I need to get it out of another automatic?

    Thanks for the help!

  5. #5
    Thermo valve replacement
    conozo's Avatar
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    Re: Have a quick question? Ask it here!

    Theres no difference between the auto and manual carbs. Junkyard will be your only place to get this part.

    1988 Honda Accord LSDX-I

  6. #6
    Thermo valve replacement

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    Re: Have a quick question? Ask it here!

    Quote Originally Posted by L05tS0ul View Post
    Thanks ShiRen, after posting this last night I called a couple auto parts stores and tried to have them look up vacuum switches for the car with zero luck so I figured a wrecking yard might be my only option. Thankfully I know where a couple are. However I know one of them is a manual, will the switch be the same or do I need to get it out of another automatic?

    Thanks for the help!
    They were pretty popular on alot of cars with carbs. Im sure there is something out there you can buy that will work.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    My Acura Type R front brake thread

    https://www.3geez.com/forum/showthrea...r+brake+option

  7. #7
    Thermo valve replacement
    ShiRen's Avatar
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    Re: Thermo valve replacement

    Problem here is Honda probably used a really random thread pitch

  8. #8
    Thermo valve replacement

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    Re: Thermo valve replacement

    I doubt it. Either BSP or standard pipe thread.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    My Acura Type R front brake thread

    https://www.3geez.com/forum/showthrea...r+brake+option

  9. #9
    Thermo valve replacement

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    Re: Thermo valve replacement

    MAQ10002 - Mini switch thermostatic vacuum fits in thermostat housing

    Distributor vacuum 78 302 - Page 2 - Ford Truck Enthusiasts Forums

    SWITCH THERMOSTATIC is a good google search start.

    I just threw a handful away last year I have had over the years with a bunch of carb junk I didnt remember where it went anymore.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    My Acura Type R front brake thread

    https://www.3geez.com/forum/showthrea...r+brake+option

  10. #10
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    Re: Thermo valve replacement

    Well I know forsure where a few are in wrecking yards so Iíll just grab one Saturday. But humor me here, could I reroute the vacuum hoses connected to that switch to another vacuum source or would I just be causing other problems supplying vacuum without that switch?

    Thanks everyone!

  11. #11
    Thermo valve replacement

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    Re: Thermo valve replacement

    Quote Originally Posted by Oldblueaccord View Post
    MAQ10002 - Mini switch thermostatic vacuum fits in thermostat housing

    Distributor vacuum 78 302 - Page 2 - Ford Truck Enthusiasts Forums

    SWITCH THERMOSTATIC is a good google search start.

    I just threw a handful away last year I have had over the years with a bunch of carb junk I didnt remember where it went anymore.
    Sorry I got COVID so struggling with word retrieval

    "Ported vacuum switch" is your hot search in google.

    I couldnt think what PVS stood for yesterday lol.



    You have to dig for one that fits the criteria you need. There should be a data sheet listed online for each sensor someplace.

    Since its for your choke pull off im sure with some experimenting you could find another vacuum source that would work but it would take alot of experimenting I would think.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    My Acura Type R front brake thread

    https://www.3geez.com/forum/showthrea...r+brake+option

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