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T-body causing bouncing idle?

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    T-body causing bouncing idle?

    Ive had a problem with my idle and Im yet to find out whats causing it. I was having a problem with my t-body staying stuck open so I switched to one from a newer m20. Mines the 87 m20 and I used one from a 90 m20. Theres only one hole for a vacuum connection on the firewall side of the t-body so I just left one of the vacuum lines disconnected. It was fine for a few months that it started ideling weird. The idel would bounce from about 1800-2200 rpm. Could this be my problem? Also could a bad t-body gasket or bad valve cover gasket cause this? Thanks

    #2
    You left a vacuum hose off and basically caused a vacuum leak and youre asking why your idle is weird?

    Will
    RIP e30 (brilliantrot '91 325i) 11/17/06 Byebye: 8/21/07
    Welcome e30 (brilliantrot '90 325is) 12/23/06
    DaveCN = Old Man
    My signature picture was taken by ME! Not by anyone else!



    Originally posted by george graves
    If people keep quoting me in their sig, I'm going to burn this motherfucker down.

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      #3
      Your idleing at 1800rpm?

      Comment


        #4
        Everyone responds with a question?

        Comment


          #5
          Originally posted by bwanac
          Everyone responds with a question?
          Are you sure?

          Will
          RIP e30 (brilliantrot '91 325i) 11/17/06 Byebye: 8/21/07
          Welcome e30 (brilliantrot '90 325is) 12/23/06
          DaveCN = Old Man
          My signature picture was taken by ME! Not by anyone else!



          Originally posted by george graves
          If people keep quoting me in their sig, I'm going to burn this motherfucker down.

          Comment


            #6
            Originally posted by bwanac
            Your idleing at 1800rpm?
            Its a steady bouncing from 1800-2200 RPM so yes.

            The reason I asked Will is because it drove fine for months with it like that, I also put my old t-body back on and it still was doing it. Would I just need to let the computer adjust to it. I only tried to turn it over twice but the idle was still jumping.

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              #7
              Fix the vacuum leak, if that doesn't work, check the coolant temp sensor, which essentially plugs into the tstat body and tells the computer what the temp is.

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                #8
                Originally posted by drshoebocks
                Fix the vacuum leak, if that doesn't work, check the coolant temp sensor, which essentially plugs into the tstat body and tells the computer what the temp is.
                Could a coolant temp sensor have anything to do with a weird idel? You know I was talking about the Throttle body right?

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                  #9
                  mine does that only after hard driving... but steadys after a few seconds... is that the case for you?
                  Claus Luthe is my hero.

                  Comment


                    #10
                    Originally posted by silversleeper
                    mine does that only after hard driving... but steadys after a few seconds... is that the case for you?

                    No...mine doesnt it right when I crank it than holds the steady bouncing.

                    Comment


                      #11
                      disconnect ur O2... itll idle purrfect!
                      Claus Luthe is my hero.

                      Comment


                        #12
                        Originally posted by silversleeper
                        disconnect ur O2... itll idle purrfect!
                        Bold statement...but Ill try it. Leave it unplugged or just unplug it and plug it back in?

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                          #13
                          unplugged... until u buy a new one.


                          btw... i love your rims, the same ones i wanted to buy not too long ago, but i want them in black with a polished lip in the widest size avail..
                          Claus Luthe is my hero.

                          Comment


                            #14
                            Originally posted by silversleeper
                            unplugged... until u buy a new one.


                            btw... i love your rims, the same ones i wanted to buy not too long ago, but i want them in black with a polished lip in the widest size avail..
                            Cool....thanks.

                            Yea Im a big fan of my wheels. There getting 20mm spacers this week. Im sure I would love them in black but they have a nice finish to them right now so Im gonna rock them like this until I get bored of them then Ill spray the centers black or gunmetal and leave the lips polished and the bolts silver.

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                              #15
                              did this help at all? did u end up fixing ur vacuum leak? what was the result cause my car is acting funny with idle too i think its a vacuum leak ijust replaced my coolant temp sensor but the 1223 light stays on now, after the idle calmed down...but 1223 is still staying on and i donno if its a bad sensor (even though i just replaced it and it seem to have fixed my idle problem) or if i have a vacuum leak...
                              e30s r kool

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