Horrible vacuum leak..

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  • priapism
    E30 Enthusiast
    • Mar 2010
    • 1182
    #1

    Horrible vacuum leak..

    I've got a terrible vacuum leak, sounds like a siren. I did take the head off a while back, is there a hose somewhere in there that I might have disconnected and forgot about? I can't see anything, but it does seem to sound like it's coming from the center of the motor.

    Is there a diagram of vacuum hoses anywhere? I'm sure it's something ridiculously stupid and simple.
    sigpic
    -Sean : 91 Calypso 325i : Castro Motorsports SoCal Spec E30 #33
    Tags: None
    • jaywood
      R3V Elite
      • Jul 2010
      • 4528
      #2
      One of the vacuum leaks that I have is wayyy under the throttle body:



      Stick your hand under the throttle body and wiggle the hose around. See if the noise gets louder/goes away.

      Also, have you tried using carb cleaner to find the leak?

        Comment

        • priapism
          E30 Enthusiast
          • Mar 2010
          • 1182
          #3
          How would I use carb cleaner?
          sigpic
          -Sean : 91 Calypso 325i : Castro Motorsports SoCal Spec E30 #33

            Comment

            • jaywood
              R3V Elite
              • Jul 2010
              • 4528
              #4
              Spray it on all the hoses and gaskets. If you spray it where the leak is, the rpm's will increase and you found your leak!

                Comment

                • priapism
                  E30 Enthusiast
                  • Mar 2010
                  • 1182
                  #5
                  I'll give it a shot, thanks!!
                  sigpic
                  -Sean : 91 Calypso 325i : Castro Motorsports SoCal Spec E30 #33

                    Comment

                    • jaywood
                      R3V Elite
                      • Jul 2010
                      • 4528
                      #6
                      Originally posted by priapism
                      I'll give it a shot, thanks!!
                      Yep, let us know if you find your leak!

                        Comment

                        • SilentJon
                          Member
                          • Feb 2011
                          • 88
                          #7
                          the only vacuum hoses are the ones to the brake booster, and the one to the fuel pressure regulator. there is the breather hose that runs from the left side of the throttle body to the valve cover.
                          is it possible that you have a torn gasket?

                            Comment

                            • E30_(1st Musk)_
                              R3VLimited
                              • May 2009
                              • 2008
                              #8
                              take it for a smoke test. when i got a smoke test i found alot more air leaks than i thought that i had
                              ]

                                Comment

                                • priapism
                                  E30 Enthusiast
                                  • Mar 2010
                                  • 1182
                                  #9
                                  Originally posted by SilentJon
                                  the only vacuum hoses are the ones to the brake booster, and the one to the fuel pressure regulator. there is the breather hose that runs from the left side of the throttle body to the valve cover.
                                  This is exactly what I was looking for. It was where the fuel pressure line connects to the head--I had taken the valve cover off a while ago to check the valves and it looks like I didn't torque the bolts down right. All gone!
                                  sigpic
                                  -Sean : 91 Calypso 325i : Castro Motorsports SoCal Spec E30 #33

                                    Comment

                                    • SilentJon
                                      Member
                                      • Feb 2011
                                      • 88
                                      #10
                                      Originally posted by priapism
                                      This is exactly what I was looking for. It was where the fuel pressure line connects to the head--I had taken the valve cover off a while ago to check the valves and it looks like I didn't torque the bolts down right. All gone!
                                      glad i could be of a little help :)

                                        Comment

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