Northstar intake manifold
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Northstar Engines and System Technical Discussion Discussion, Northstar intake manifold in Cadillac Engine Technical Discussion; 1997 code Y motor. At the end of the intake manifold next to the power steering pump (opposite end from ...
  1. #1
    Harry Yarnell is offline Cadillac Owners Fanatic
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    Northstar intake manifold

    1997 code Y motor.
    At the end of the intake manifold next to the power steering pump (opposite end from the throttle body), is a large flapper thingy that opens directly into the intake. It's spring loaded closed. What is it, and what's its purpose? Looks like a toilet tank flapper valve.

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    JimD is offline Cadillac Owners Connoisseur
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    Re: Northstar intake manifold

    That is a relief valve to prevent positive pressure damage to the non-metallic manifold as in the case of a "backfire".

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    Re: Northstar intake manifold

    Auxilliary throttle plate

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    ewill3rd is offline Cadillac Technician
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    Re: Northstar intake manifold

    It's called a "backfire valve" it pops open in the event of a backfire so the intake doesn't explode.
    Guess how they figured out that it needed to be there?

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    Re: Northstar intake manifold

    They figured out that it might be easier to give out burp instead of giving out a stinkie FART?

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    ewill3rd is offline Cadillac Technician
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    Re: Northstar intake manifold

    We also had problems on some 3800's back in the 90's with exploding intakes. They issued a software update for the PCM to fix that concern though.
    Not sure if I can find any pictures but I have seen some.

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    Re: Northstar intake manifold

    Quote Originally Posted by ewill3rd
    We also had problems on some 3800's back in the 90's with exploding intakes. They issued a software update for the PCM to fix that concern though.
    Not sure if I can find any pictures but I have seen some.
    I remember hearing about that when I did some research prior to replacing the intake on my wifes '96 Bonnevile (not for that reason).

  9. #8
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    CadillacSTS42005 is offline Banned
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    Re: Northstar intake manifold

    exploding intakes are fun especally when you do a wet nos system and it pools in the intake then KABOOMY!!!!!!!

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