Vacuum Routing Diagrams — Ford Bronco 1978-1979
Technical Reference
Member-uploaded diagrams & documents for this generation. AI-classified; community-verified where badged.
Vacuum Routing
- Vacuum distribution schematic routing engine vacuum to the power brake booster, A/C controls, automatic transmission diaphragm, speed control reservoir and EGR/EVAP.
- Vacuum routing schematic for temperature selector valve and a-port selector feeding water valve, outside-recirc, temp blend door, and panel/floor/defrost vacuum motors with color-coded hose paths.
- Heater/AC vacuum system operation plus a vacuum motor test chart listing applied vacuum (inches) per function/temperature lever position for outside, water, panel-floor, and heat-defrost motors.
- 1978 Ford emission-control vacuum routing diagrams for the 400 V8 pickup (Federal, automatic): EGR valve, EGR vacuum control valve, spark delay valve, PCV valve and vacuum amplifier hose paths.
- 1978 Ford exhaust-emission vacuum diagrams for the 400 V8 pickup/Bronco with automatic trans, showing EGR valve, spark delay valves, PVS, air pump and vacuum reservoir routing.
- Ford Important Vehicle Information (VECI) underhood decal for a 1986 E-250 351W 4V: timing/idle set procedures and vacuum hose routing schematic; base timing 10 BTDC.
- Vacuum hose routing diagram for a 6.6L 400 CID engine showing EGR, carburetor, distributor and emission valves with calibration label.