Vacuum Routing Diagrams: Ford Bronco 1987-1991

Technical Reference

Member-uploaded diagrams & documents for this generation. AI-classified; community-verified where badged.

Vacuum Routing

• 1989 Ford emission label with EEC IV/EFI ignition timing procedure set to 10° BTDC and a vacuum hose routing diagram showing EGR and TAB/TAD solenoids.
• Ford Thermactor Combination Valve Diagram - Air Bypass/Control Ports Labeled
  This document is a labeled line drawing of a Thermactor secondary air system combination (bypass/diverter) valve, as used in Ford emissions systems. The illustration identifies six key features of the valve with…
• 1993 Ford 5.0L California VECI Label - Vacuum Hose Routing & Timing Specs
  This document is a Vehicle Emission Control Information (VECI) label from Ford Motor Company for a 1993 model year light-duty truck with the 5.0L (HM) engine, certified for sale in California and OBD I certified. It…
• 1993 Ford Bronco 49-State VECI Vacuum Hose Routing Diagram - EGR, AIR, CANP
  This document is a color-coded vacuum hose routing diagram for a Ford truck emissions/vacuum system, uploaded as a 1993 49-state VECI (Vehicle Emission Control Information) schematic to a 1990 Ford Bronco gallery. The…
• Ford VECI label for a 1991 light truck: 10° BTDC timing, firing order 1-5-4-2-6-3-7-8, ASF-42C plugs at .042-.046 gap, code GGA, with vacuum hose routing.
• Ford Bronco Vacuum Hose Routing Diagram - Under-Hood Emissions Decal
  This document is a photograph of a factory under-hood emissions decal titled "VACUUM HOSE ROUTING," uploaded to the gallery of a 1987 Ford Bronco. The decal shows a color-coded schematic of the engine's vacuum hose…
• Ford 5.8L Secondary Air Injection (Thermactor) System Diagram - TAB/TAD Routing
  This document is a schematic diagram of the Secondary Air Injection (Thermactor) system as used on a Ford 5.8L engine, uploaded to a 1990 Ford Bronco gallery. It shows how the PCM/EEC computer receives inputs from the…
• Ford 5.0L & 5.8L Serpentine Drive Belt Routing Diagram Decal - Bronco/F-Series
  This document is a scanned underhood decal showing serpentine drive belt installation/routing for Ford 5.0L and 5.8L V8 engines, presented in both English and French. The diagram illustrates the belt path around seven…
• Ford Bronco Vacuum Hose Routing Diagram - Underhood Emissions Decal
  This document is a photograph of a factory underhood emissions decal titled "VACUUM HOSE ROUTING," uploaded to a 1987 Ford Bronco gallery. It shows the complete vacuum hose schematic for a carbureted engine, with…
• Ford emissions label for a 1988 light-duty truck 5.0L: timing 10° BTDC, firing order 15426378, ASF-42C plugs and vacuum hose routing.
• Ford 5.0 AIR Injection (Thermactor) System Diagram - Pump, Hoses & Part Numbers
  This is a Ford exploded parts diagram (drawing number P-20661, printed/dated 09/26/2008) showing the AIR injection (Thermactor secondary air injection) system routing and components on a V8 engine. Two views are shown…
• Ford EVR Solenoid Diagram - Pin 33/12v Wiring & EGR Vacuum Hose Routing
  This document is a labeled line drawing of an EGR Vacuum Regulator (EVR) solenoid, uploaded as part of an emissions/vacuum-routing reference set for a 1990 Ford Bronco. The illustration shows the cylindrical solenoid…