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Vibration only in drive while parked.

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    #1

    Vibration only in drive while parked.



    not really sure where to start for diagnosis.

    It idles fine (a little low IMO) at ~600rpm while in park or neutral. But as soon as i put it in drive the idle drops to about 500rpms and shakes a little.. I dont think its a missfire or anything like that.. I think it may have something to do with the transmission.. ??

    what are your thoughts?

    Oh, also, the vibration goes away as soon as i go from a stop.. There is no loss of power, and it doesnt sputter or anything. So i dont think its the timing.
    Tags: None
    #2
    Have you checked any of your mounts?
    Could be your IACV (idle air control valve) (this was the issue with mine doing the exact same symtoms your are describing).
    Or it could be FITV (fast idle thermo valve).

    Comment

      #3
      Also, check valve clearance and adjust if needed.
      A&P-IA

      Comment

        #4
        thanks for the response fellas. .

        Should i just replace the IAC? maybe find one at a junk yard..

        Comment

          #5
          there are a million threads on how to clean the IAC ,, you should definately notice a difference if it was never cleaned before
          10th Anniversary Accord.
          05 Audi A4 Ultra Sport 6MT.

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            #6
            Originally posted by 10thAnnivCB7 View Post
            there are a million threads on how to clean the IAC ,, you should definately notice a difference if it was never cleaned before
            This is very true ^
            I have also found the front torque mount on the autos wear out rapidly and the rear hydro mount is simply trash. Those fixed my heavy vibration at idle.... But I've Manuel swapped it now and got great ESP mount kit... Highly recommended.... By me

            Comment

              #7
              I thought IACV was only active when in neutral?
              I figured that vibration was just from the crank trying to send power through the torque converter, but not being able to because you've got the brakes on and not moving. And then hard, old mounts on top of that. No?
              Cause my auto vibrates just a little bit in the exact same situations. And I know of other autos that I've ridden in lately that do it pretty bad at times.

              ^^Photos taken by me ^^

              Comment

                #8
                Originally posted by Stormtrooper View Post
                I thought IACV was only active when in neutral?
                No it is active in all gear positions.

                As has already been said, check your mounts.


                Car Safety / General Servicing Checks --------Basic suspension checks

                My 5.7 LS1 Holden Ute

                A "Finished" project car is never finished until its been sold.

                If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.

                Comment

                  #9
                  Originally posted by evil_demon_01 View Post
                  No it is active in all gear positions.
                  Cheers

                  ^^Photos taken by me ^^

                  Comment

                    #10
                    Front motor mount.
                    What makes me laugh about forums, is that no matter how much you try to help someone, they dont take the advice. Go ahead and do it the hard way.

                    You got to respect what you drive, and appreciate what you have, making the best of what you got. and if that means putting CAI, HID's, a phat stereo system, and a idiot in the drivers seat...then so be it!

                    Retro!

                    Hater

                    I love nooBs...They make me look good

                    Comment

                      #11
                      i'll take a look at it in the morning.. Its really not that bad, but i want to tackle the situation before it gets worse.

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