Here is a general vacuum hose diagram for a 1987 El Camino 5.0 liter V8 4 barrel carburetor:
1. PCV valve: The PCV valve connects to the intake manifold and the valve cover. It helps to regulate the pressure inside the crankcase and draws air and oil vapors back into the engine.
2. Brake booster: The brake booster is connected to the intake manifold and the brake pedal. It assists the driver in applying the brakes by amplifying the force applied to the brake pedal.
3. Distributor: The distributor is connected to the intake manifold and the spark plugs. It distributes the spark to the spark plugs in the correct firing order.
4. Fuel pressure regulator: The fuel pressure regulator is connected to the fuel line and the intake manifold. It regulates the fuel pressure in the fuel system.
5. EGR valve: The EGR valve is connected to the exhaust manifold and the intake manifold. It helps to reduce emissions by recirculating exhaust gas back into the engine.
6. Charcoal canister: The charcoal canister is connected to the fuel tank and the intake manifold. It helps to control fuel vapor emissions by absorbing and storing fuel vapors and releasing them back into the engine when the engine is running.
7. A/C compressor: The A/C compressor is connected to the intake manifold and the A/C evaporator. It compresses the refrigerant gas in the A/C system.
8. Cruise control: The cruise control is connected to the intake manifold and the throttle body. It helps the driver to maintain a set speed without having to keep their foot on the gas pedal.
These are just some of the main vacuum hoses on a 1987 El Camino 5.0 liter V8 4-barrel carburetor. There may be other hoses depending on the specific options and features of the vehicle.
