Question about BMW 318

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I need the vacuum line diagram for 1991 bmw 318is

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  • Harold Kimbrough Jul 13, 2010

    very good info,thank you

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RED: Intake Boot to Idle Air Control Input
GREEN: Idle Air Control Output to
Throttle Body Vacuum Port
BLUE: Engine Vent to
Throttle Body Vacuum Port
YELLOW: Fuel Pressure Regulator to
Throttle Body Vacuum Port




i need the vacuum line - ad0567d.jpg


Posted on Jul 12, 2010

  • raj somaiya
    raj somaiya Jul 12, 2010



    The vacuum line you speak of is for the fuel pressure regulator
    the other end hooks to a fitting on the side of the throttle body to get vacuum. hose
    on the end is connected to the front vacuum port just above the throttle body
    and under the air plenum's.There are three hoses in total.



    There are two on the top, one goes towards the fuse box above the
    steering column, the other goes straight up. Then there is one on the bottom
    that goes straight down.

    With the solenoid not activated, the airflow passes thru from the horizontal
    one at the top to the bottom one pointing down.



    the vacuum line for the secondary air was connected to the oil
    seperator by way of the fuel rail. 



    The
    intake manifold is designed with a vacuum actuated flap that divides the
    interior. The flap will open and close depending on engine speed and throttle
    position. The two positions form a long path and a short path for the air to
    flow before it is drawn into the intake runners for each cylinder. By changing
    the effective length of the intake manifold, the intake pulses of air will
    resonate at differing frequencies. By varying the resonant frequencies as the
    engine speed varies, a greater ram effect can be achieved.



    For the
    flap to actuate, two conditions must be met. The throttle must be at full open,
    with the full throttle switch closed, and the engine speed must be less than
    4120 rpm or greater than 6720 rpm. If these conditions are not met, the flap
    will not actuate. When these conditions are met, the resonance flap control
    unit will signal an electric vacuum switch to open allowing vacuum to operate
    the flap. A tolerance of 60 rpm in each direction for the engine speed
    switching points prevents constant motion of the flap if the engine is operated
    at exactly either of those speeds.



    On cold
    engine start-up, the resonance flap control unit does a self-check. The flap
    will be actuated and can be watched as the linkage moves. The electric vacuum
    valve has battery voltage applied to one terminal and the other terminal goes
    to the control unit. The control unit will ground the terminal allowing the
    circuit to be completed.



    The
    resonance flap control unit is located under the relays in the electronics box
    mounted in the engine compartment. The electric vacuum valve is located under
    the intake manifold next to the oil trap. The flap actuator is attached to the
    intake manifold at the top and has a link connecting to the flap inside the
    manifold.





    The vacuum source for the system is a vacuum
    reservoir mounted below the intake runner for cylinder 5. The vacuum tank is
    necessary since there would not be enough manifold vacuum to operate the flap
    at wide throttle positions. A check valve prevents loss of vacuum from the tank
    while the manifold vacuum is low or when the engine is not running. The tank
    provides enough vacuum for 6 operations of the flap without manifold vacuum.


    Thanks. Keep updated for any more query. You can rate this
    solution and show your appreciation.



     


     



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