Question about Honda Prelude

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Where do the hoses that run off my idle control valve go? shes a 94 honda prelude si h23

Where dose the hoses that come off go?

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  • justin campise Feb 23, 2012

    water pump? i just had the top end off and now im confused.......help please

  • justin campise Feb 23, 2012

    no not throttle body. its my i.a.c. valve. the iac is located on the intake manifold and has two lines coming off it, they are coolant. one goes in a tight spon right under mi i. m. the other can go there to but for some reason i think one hose came frome water pump, you say water pump to throtle body area? that means i got it right but it runs like ****...

  • wadingriver
    wadingriver Feb 23, 2012

    Some cars have the throttle body and IAC combined. The answer is still the same . The Idle is determined by the heat of the coolant.
    Sure sound like you have it right.
    You had the Intake and or Head off.. look for other Vacuum leaks if it's runnig bad

  • justin campise Feb 23, 2012

    it started with my idle bouncing, only when cold. once warm itl drop down and purr. i read online if you clean your iac valve itle stop so i did but i broke the lines coming off, they were real brittle. then broke more replacing those, next thing i no i got intake manifold off. shes complete now but still bouncing idle and its worse than before, it dont stop when its warm.....im thinking i got coolant lines mixed up?????

  • wadingriver
    wadingriver Feb 23, 2012

    It sounds like you cleaned the High Idle area Not the IAC which is an electrical component.
    IAC gets carbon deposits and holds it open when it shouldn't be.
    90% sure it does not matter what hose goes where on the High Idle area. As long as coolant circulates through it, it will work

  • wadingriver
    wadingriver Feb 23, 2012

    you are correct On this year it was basically a thermostat controlled Idle.
    If the car idles down. You have teh hose correct. A surging idle is usually a vacuum leak.
    You put a new intake manifold gasket on, you torqued teh Intake down properly?

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: honda prelude si 1991

I had the sme problem with my 1992 prelude si. The problem with mine was that the intake manifold gasket was leaking horribly. The idle would go up and down just setting there, but when I held the brake long enough it stopped. An easy way to see if it is the gasket is get WD40 or Brakleen or soemthing like that, and spary it where the intake manifols bolts to the block. If you hear a change in the idle speed (faster or slower) just change out the gasket.

Posted on Mar 31, 2009

yankstorm02
  • 145 Answers

SOURCE: 1989 honda prelude. engine surges. from normal to 2100 rpms

There is a warm up valve on the throttle body(should have 2 small coolant hoses). remove the valve and have someone start the car while you block the port to the valve on the intake. If that clears up the problem you can cut a piece of cardboard to mount in between the valve and intake.should straighten it out.

Posted on Oct 01, 2009

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