![]() This line goes has a series of Ts that split this unregulated vacuum off to the various vacuum driven devices on the car. There is a port on the rigid vacuum line to which a smaller vacuum line attaches. This line is ~3/8" in diameter, and made of rigid plastic. The big line thatcomes out of the vacuum pump leads to the brake booster. Vacuum comes from the vacuum pump located on the driver's side of the head. ![]() Two of the ports on N75 are labeled, and the third is the vent port.Ĭheck to see if the line attached to 'vac' port is pulling >25inHg vacuum. If the solenoid in question does not have a line leading to the turbo actuator, it is not the N75. The N75 has three lines running out of it eachĬonnecting to a nipple/port. Check to see that this device is getting sufficient vacuum by using your vacuum pump to measure the amount of vacuum on it while the engine is running. The device (N75 solenoid) that the ECU utilizes to adjust the amount of vacuum reaching the turbo actuator relies on a constant supply of vacuum from the vacuum pump. Cause # 5 vacuum leaks or faulty vacuum pump.
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