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Thread: Weber DGV Noise

  1. #1
    DX User
    Join Date
    Apr 2005
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    6

    Weber DGV Noise

    my engine/carb is now making a "rumble" sound after the carby swap
    something like bru-bre-brap-bru sound when you let go off the throttle on speed around 60+ kph

    drives fine though, idles good

    checked the plugs (new), had it serviced


    any ideas?

    cheers



  2. #2

    A20A1's Avatar
    Join Date
    Sep 2001
    Vehicle
    2006 Chevy Cobalt LS
    Location
    Kaneohe, Hawaii, United States
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    88,734
    It depends... how is your setup now... what vacuum lines if any did you keep. Have you upgraded the fuel pump... when you close the thorttle vacuum jumps sharply for a few seconds before it settles to normal... this spike will pull your vacuum advace making changes in the timing.

    What rpm is the car at.
    Normally slamming the throttle closed when the revs want to stay high will create a void so you might get some exhaust pops and some intake pops, especially if you are firing too early.

    Make sure the PCV is still hooked up... other them that I'd need more info on your setup to make anymore assumpions on whats causing your noise.
    - llia


  3. #3
    DX User
    Join Date
    Apr 2005
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    6
    vacuum lines are connected
    engine is stock, fuel pump is stock I dont think I need a new fuel pump just for the weber swap as the stock pump can handle the weber fine.
    it normally happens around 2500 rpm +
    everything hooked up properly
    no backfire from the exhaust or carby just that air noise.

  4. #4

    A20A1's Avatar
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    You sealed the coolant port on the manifold...?
    - llia


  5. #5
    DX User
    Join Date
    Apr 2005
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    6
    I did seal the port

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