1. Carburetor:
- There should be two vacuum ports on the carburetor.
- One port goes to the distributor for vacuum advance.
- The other port goes to a vacuum reservoir/canister, which is usually mounted on the firewall or near the brake master cylinder.
2. Brake Booster:
- The main vacuum supply for the brake booster comes from the intake manifold.
- There should be a vacuum hose that connects the brake booster to the intake manifold.
3. EGR Valve:
- The EGR (Exhaust Gas Recirculation) valve has two vacuum ports.
- One port goes to the vacuum reservoir or canister.
- The other port goes to the EGR solenoid, which is controlled by the ECU (Engine Control Unit).
4. Fuel Pressure Regulator:
- The fuel pressure regulator has a vacuum port.
- This vacuum line goes to the intake manifold.
5. 4x4 System:
- On the 4x4 models, there is a vacuum switch mounted on the transfer case.
- This switch controls the vacuum supply to the front axle actuator, which engages or disengages the 4x4 system.
6. Miscellaneous:
- Some other components that may have vacuum lines connected to them include:
- PCV (Positive Crankcase Ventilation) valve
- Emission control devices, such as the air pump and charcoal canister
- Cruise control servo
I recommend referring to a specific repair manual or diagram for your exact vehicle model and year to ensure accurate vacuum line routing.
