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.
1987 Ford Cab & Chassis 5.8 H, 4WD, AutomaticFACTORY OEM SERVICE PROCEDURE
Control Module-To-Distributor Wiring Harness
- Separate 4-wire control module connector. Attach ohmmeter lead to distributor base. Alternately connect the other ohmmeter lead to wiring harness connector terminals that mate with Orange and Purple wires of control module connector.
- Resistance should be greater than 70,000 ohms. If within specification, proceed to IGNITION COIL SECONDARY RESISTANCE test. If not, check wiring harness between control module connector and distributor. After test, reconnect 4-wire connector.
Factory Service Tools
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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.
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