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Idle stay constantly high.

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    #1

    Idle stay constantly high.

    Hello every one,
    I cleaned my throttle body and the EGR valve. After I reassembled every thing, it started fine and seems normal. I drove to the market and when put into park I noticed the idle stays high. Not only that the when I take my foot off the gas pedal, the tachmeter drops down very slowly. I have a video to show the problem. Please list what could be the problem?
    Could cleaning the throttle body stuff my IACV?
    http://youtu.be/jYothpn510E

    Thanks.
    Tags: None
    #2
    if it was a vacuum leak, the idle would be Higher than normal. check if you throttle cable is loose.

    Comment

      #3
      Since you messed with the throttlebody, you should go through the set a base idle procedure, and see if you can adjust your idle back to normal. If you can't adjust the idle back down, you probably have a vacuum leak somewhere.
      PT3/6 Development Thread | My 1991 LX Coupe | DIY: 90-93 Tcu Fix

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        #4
        Did you guys notice the delay of the tachmeter dropping back down after revving up? What do you think causing that? If I clean my IACV, I take the 2 bolts off, but leave the coolant lines, would coolant comes out? Last time I cleaned it was 4 years ago and I took the 2 hoses off and there was coolant in them.
        Thanks.
        Last edited by Bad_dude; 03-14-2012, 10:07 PM.

        Comment

          #5
          Originally posted by Bad_dude View Post
          Did you guys notice the delay of the tachmeter dropping back down after revving up? What do you think causing that? If I clean my IACV, I take the 2 bolts off, but leave the coolant lines, would coolant comes out? Last time I cleaned it was 4 years ago and I took the 2 hoses off and there was coolant in them.
          Thanks.
          just take it all the way off anyways, its way easier, and maybe look at your o2 sensor for the very slow idle drop, not sure what else could cause that

          Comment

            #6
            Originally posted by 93redcb7 View Post
            just take it all the way off anyways, its way easier, and maybe look at your o2 sensor for the very slow idle drop, not sure what else could cause that
            The O2 sensor was replaced 2 weeks ago. It runs good so far. It's was a Denso from Rock Auto. What are the chance of a vacuum line coming off the air control box? Could the box be opened for vacuum line check?
            Thanks.

            Comment

              #7
              OK. GhostAccord over at Honda-Tech suggested that when I cleaned my TB, I may have pushed some carbon into the IACV and clog the screen up. If I clean it, it might help getting back the correct idle. First, I checked for vacuum leak as I am thinking one of the vacuum tube might have pulled out of the black air control box. I started the car running cold and use a can of brake cleaner spraying a little at each of the vacuum tubes and no change in idle so I think no leak. So I clean the IACV with throttle body cleaner. I waited for an hour for it to dry. Then while waiting, I clean up the TB again with a toothbrush. Here's the video below of the results. Though it's not perfect, I think a few days of driving it the computer will learn to keep the idle more constant. I think this happens last time too, about 4 years ago. Close to the end of the video where I unplug the IACV, and then put it back in, there's a weird noise coming from the air box, I don't know what it is. Could it be the intake is sucking in more air with the idle increase when the IACV is plugged back in?
              Please look at the video and see if it looks like it's back to normal to you? My car is a 90 Accord LX 4 speed auto.
              http://youtu.be/cBKAicSJfv8
              Thanks.

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