4.8.3 From HAI The HAI (Hot Air Intake) diaphragm is the big round silver thing on the air cleaner snorkel. It has a single vacuum hose port. Single port connects to HIC port (a) The following note from JimC may be handy if you'd like to keep the HIC function but not the HAI function: "The HIC valve does control the HAI for faster warmup. The HIC also provides (as the name indicates) Hot Idle Compensation, raising the idle speed when engine bay temps are high, to help turn the fan & WP faster and cool things off. So, if the HAI is undesirable, just cap off the HAI vacuum nipple on the HIC valve.
HAI will be disabled, but the HIC function will remain." 4.9 From Fuel Cut Vacuum Switch This vacuum switch has a single port on it. To carb Fuel Cut Port (unchanged from stock) 4.10 From PCV Valve Routing from the PCV (Positive Crankcase Ventilation) valve is unchanged from stock. A large hose runs from the PCV valve and around the back of the engine to the PCV inlet plate on the intake manifold on the driver side, just below the carburetor. There should be a "T" fitting in this large line close to the PCV valve. From the "T" fitting, a smaller line connects to HIC port (b). 5 Reference Material 5.1 JimC Desmog Diagrams I believe these diagrams posted by JimC are where it all started.
They are modified versions of the "component layout and schematic drawing" from the 2F Emission Control Repair Manual. They show everything - which components are removed in a desmog, and how to route the vacuum lines. You're encouraged to study them closely - and compare them to the originals - until you understand them. Included below are the originals from the FSM and the edited versions from JimC. The diagrams are shown in pairs: the component layout diagrams are first, followed by the schematic drawings. In both cases, the original diagram is followed by the edited version from JimC. Version 2 / 01-May-2011 Page 17 of 24