Below is a complete checklist of devices connected to vacuum along with Nissan diagrams (slight aesthetic/readability modification). You should be able to follow the vacuum lines in your car pretty effectively with these diagrams. Note that ANY OF THESE devices or their associated hose/clamps could be defective/loose resulting in VACUUM/BOOST LEAK! Refer to your engine bay along with these diagrams. Instead of just seeing a tangled web of hoses, you will gain understanding of the vacuum system design, which should help you pinpoint problem areas and facilitate fixes.
The only TECHNICAL change I made is the location of the AIV and EGR solenoids. It has been noted by most Z owners (as they remove their AIV systems) that the AIV solenoid is usually the one located closest to the battery. The Nissan diagram shows the EGR closest to the battery. These valves look identical. You should be able to tell quickly which is which on your car by following the connected vacuum lines to their respective devices. A hose, gasket (to housing), or hose clamp will inter-connect each component to the manifold, air gallery (vacuum hardline), or to another device that can be under vacuum.
|Itemized List of VACUUM DEVICES
Includes all items connected by a Vacuum Line
IF YOU THINK OF OTHERS, PLEASE EMAIL ME!
Air Galleries (vacuum hardlines):
|EGR Control Solenoid
AIV Control Solenoid
Passenger Side AIV
Passenger Side AIV Actuator
Driver Side AIV
Driver Side AIV Actuator
Passenger Side Throttle Chamber
Driver Side Throttle Chamber
Passenger Side Recirculation Valve
Driver Side Recirulation Valve
Factory Boost Sensor
Passenger Side Valve Timing Solenoid Valve
Driver Side Timing Solenoid Valve
IAA (Idle Control Valve)
Canister Purge Line
A/C and Heater Control (???)
Clutch Vacuum Assist
Break Vacuum Assist
Driver Side Wastegate
Driver Side Wastegate Actuator
Passenger Side Wastegate
Passenger Side Wastegate Actuator
Fuel Pressure Regulator
FICD (Fast Idle)
All vacuum hoses (too many to list)
Intake Tract Hoses
PCV Valve System
To make reading the diagrams below easier, you may want to print out the following numbered list and refer to it as you view the diagrams. The numbers refer to (and point to) vacuum hoses, though it may be a bit tough to see from the wonderful, high resolution of these diagrams (note sarcasm).
PCV Valve System
INCOMPLETE GRAPHICS -- May be helpful for now, anyway.