![]() The Map sensor detects excess boost pressure in the intake. The Map regulator is electronically operated by the Map sensor via the ECU. The Map regulator N75 can bleed vacuum to the air filter. (In the old days, more vacuum meant more turbo, this is not the case with variable vane turbo’s.) This allows vacuum to pass to the turbo actuator and pulls the actuator to actuate the turbo. Vacuum is then lost and the flap valve springs open again. Vacuum in the intake manifold flap valve regulator, acts on an actuator to pull the intake manifold flap shut for 3 seconds when the engine is switched off. Vacuum passes to the Intake manifold flap valve. An electrical impulse from the ECU also controls the bleed off and therefore the opening and closing. The EGR valve can bleed vacuum to the air filter which lets it shut. Vacuum passes to the EGR valve The EGR valve controls the EGR actuator which moves a flap between the exhaust and intake manifolds and holds it open. ![]() Vacuum passes through a one way valve to the brake servo to give assisted brakes. This vacuum (suction) is used to control four systems. When you start the engine The engines tandem pump produces the vacuum (sucks).
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