Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1985BRONCO 5.8 G, STANDARD, TODREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 40 (5.0L EFI EEC IV TESTING)
1985 Ford Bronco 5.8 G, Standard, TOD
Section 40 (5.0L EFI EEC IV Testing)
1985 Ford Bronco 5.8 G, Standard, TODSECTION Section 40 (5.0L EFI EEC IV Testing)
WARNING: This page is about a different car, the 1986 Ford Pickup, 1986 Ford Econoline, 1986 Ford Club Wagon, and 1986 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
- Diagnosis & Testing
- Quick Tests
- Circuit Test
- How To Use Circuit Tests
- Test A - No Start
- Test B - Vehicle Battery
- Test C - Reference Voltage
- Test D - Act Sensor
- Test E - EGR Valve Position (EVP) Sens, EGR CTRL (EGRC) Solenoid & EGR Vent (EGRV) Solenoid
- Test F - Coolant Temperature Sensor
- Test G - Map/BP Sensor
- Test H - Knock Sensor
- Test I - Throttle Position Sensor (TPS)
- Test K - EGR Valve Position (EVP) & EGR Valve Regulator (EVR)
- Test L - EGR Valve Position (EVP) & EGR Valve Regulator (EVR)
- Test M - Neutral A/C Switch Input
- Test N - Key Power Check
- Test O - Brake On/Off (Boo) Switch
- Test R - Fuel Control
- Test T - Inertia Switch
- Test U - EGR On/Off Check
- Test V - Air Management System
- Test X - Idle Speed Control (By-Pass Air)
- Test Ee - Dynamic Response Test
- Test Ff - Ignition Diagnostic Monitor (IDM)
- Test GG - Spark Timing Check
- Test HH - No Codes/Codes Not Listed
- Test II - System Check
- Test JJ - Erratic Ignition
- Test KK - Inlet Air Solenoid (IAS)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.