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Possible Vacuum Leak with BBK SSI manifold...

This is a discussion on Possible Vacuum Leak with BBK SSI manifold... within the External Engine forums, part of the LSx Technical Help Section category; I have been tracking down a vacuum for a couple of weeks. I bought the car it had the BBK ...

  1. #1
    Experienced Old Fart jfl330's Avatar
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    '02 35th SS LE SLP#1084

    Possible Vacuum Leak with BBK SSI manifold...

    I have been tracking down a vacuum for a couple of weeks. I bought the car it had the BBK SSI and 80mm TB on it. I found a few glaring issues I fixed and am trying not to pull the intake off.

    I removed the cover plate on the egr hole (which I don't have, '02) and found the oring that should seal the plate to the intake does not fit right (see photo).



    Do you think that this could be a potential vacuum leak source? The groove is ~ 0.170 deep and the oring is 0.130 thick.

    If anyone has a BBK SSI and no egr, could you pop the plate off and see if the oring makes a good seal?

    Thanks.

    Jon

  2. #2
    None Shall Pass Knight's Avatar
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    99 WS.6 - Modified

    It could very well be the source of your vacuum leak. To confirm, put the cover plate back on, spray a little starting fluid around the area while the car is running. If the idle raises, you've found the leak.

  3. #3
    Waiting on the Tree transamtom's Avatar
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    Fill that gap/ring with some RTV sealant and bolt it back on.

    Let it dry for a day and all should be well.

  4. #4
    Experienced Old Fart jfl330's Avatar
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    '02 35th SS LE SLP#1084

    Quote Originally Posted by transamtom View Post
    Fill that gap/ring with some RTV sealant and bolt it back on.

    Let it dry for a day and all should be well.
    I sent that pic to BBK, they said they have never seen the groove cut that deep before. They said same thing, fill with RTV and cover it up.

    Jon

  5. #5
    Waiting on the Tree transamtom's Avatar
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    Quote Originally Posted by jfl330 View Post
    I sent that pic to BBK, they said they have never seen the groove cut that deep before. They said same thing, fill with RTV and cover it up.

    Jon
    Just shows I give some pretty good advice

  6. #6
    Electrical Engineer KMdef9's Avatar
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    If this didn't solve your leak issue, it could be a PVC leak.


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