Service Procedures — Ford Bronco 1987-1991

Technical Reference

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

Service Procedures

• Service procedure for testing the canister purge regulator valve, with voltage/vacuum test steps and a labeled drawing of the valve (Figure 11).
• Ford speed control service page 31-4 listing component locations (clutch interlock switch, EEC module, servo amplifier, dump valve, speed sensor) and describing how the cruise control circuit works above 30 mph.
• Ford CPR service instruction sheet (I.S. 9273) for the Idle Air Adjust Spacer kit F2PE-9F939-AA, used to correct throttle-bore sludge; lists kit contents and 6-step installation procedure.
• Ford Racing Performance Parts idle-setting instruction sheet (IS-1850-0156): disconnect IAC, set idle via throttle stop, set TPS to 0.96-0.98 volts on black/green or gray wires, reconnect IAC.
• Page 9 (final) of the Ford Motorsport Mass Air install: reconnect PCV/EGR/throttle, install hump hose and air meter (flow arrow toward throttle body), and the Pants Y-adapter with nipple capped; cut 1 inch from inlet hoses.
• Page 8 of the Ford Motorsport Mass Air install: connect overlay fuel-injector harness, install air cleaner lid, reinstall upper intake with new gasket; bolts 18-21 lb-ft criss-cross, support bracket 12-18 lb-ft.
• Page 7 of the Ford Motorsport Mass Air install: 1992-and-later EEC-IV removal, then installing the Motorsport processor and overlay 60-pin harness; mounting bolt torque 4-10 in-lb, do not overtighten connectors.
• Page 6 of the Ford Motorsport Mass Air install: 60-pin harness and 1987-1991 EEC-IV processor removal through the driver's-side kick panel (scuff plate, push pins, processor insulator and bracket).
• Page 5 of the Ford Motorsport Mass Air install: remove upper intake manifold (T40 Torx in 1/4-in socket on 6-in extension), disconnect the 8 production fuel injector connectors and the 60-pin EEC-IV engine harness.
• Page 4 of the Ford Motorsport Mass Air install: disconnecting vacuum-tree lines to EGR valve and fuel pressure regulator, removing the EGR tube fitting and upper intake support bracket bolts.
• Page 3 of the Ford Motorsport Mass Air install: upper intake removal steps, disconnecting throttle/kickdown cables, EGR and IAC connectors, and cutting/plugging the MAP sensor molded vacuum tree hose.
• Page 2 of the Ford Motorsport Mass Air install: tools required (T40 Torx, torque wrench) and parts list including EEC-IV processor, air meter, fuel injector overlay harness; intake gasket PN E5TZ-9H486-A.
• Ford Motorsport/SVO Mass Air conversion kit install manual (M-9000-T51, covers T50/T52/T53) page 1: converts EEC-IV speed-density F-Series V8 trucks to mass-air, with 5.0L and H.O. 5.8L firing orders.
• Service procedure illustration showing removal of the instrument cluster bezel from the dashboard.
• Service procedure illustration showing a hooked tool inserted into the headlamp knob slot to depress the spring and remove the shaft.
• Tuff Stuff Performance Accessories install sheet for Ford PMGR mini starters (PN 6124/6131/6132); mounting bolts torque to 38 ft-lbs, 12V negative ground, 30s max cranking.
• Service manual page giving step-by-step clutch pedal and master cylinder removal with a labeled underdash figure.
• Service procedure for installing the MSD noise filter capacitor, with numbered mounting/wiring steps and a figure showing red and black lead connections.
• Shop manual troubleshooting chart (60-9) covering voltmeter low/high voltage and always-on engine warning indicator; check shorts on 39 R/W or open 31 W/R wire.
• Shop manual troubleshooting chart (60-8) for instrument cluster: gauge-not-moving, no-cluster-voltage, inoperative tachometer and warning-indicator conditions with causes and actions (check fuse 18).
• Ford Racing idle-setting instruction sheet: disconnect IAC solenoid, set idle via throttle stop, and set TPS to .96-.98 volts in sequence.
• Transmission Range sensor test chart for E4OD/4R70W: ohmmeter resistance values per gear position to verify start, backup-lamp, and 4x4 low circuits.
• Service procedure steps 2.5b-2.5c showing drum brake adjuster access with a photo and an instructional figure.
• Illustration showing location of early-model EEC-IV relay and housing assembly mounted in the engine compartment against the left side fender apron with wiring assemblies.
• Horn/cigar lighter diagnostic troubleshooting chart: conditions, causes and test actions including checking Fuse 16, Horn Relay connector 460 (Y/LB), and circuit 1 (DB) ground.
• Service procedure step 16 showing how to seat the solenoid body connector into the valve body receptacle until an audible click (D9195-1B).