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 MANUALSFORD1988BRONCO 4.9 Y, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - DURA-SPARK IITESTINGGROUND CIRCUIT CONTINUITY
1988 Ford Bronco 4.9 Y, Automatic
Ground Circuit Continuity
1988 Ford Bronco 4.9 Y, AutomaticSECTION Ground Circuit Continuity
- Insert a small straight-pin in control module Black wire. DO NOT allow straight-pin to contact ground. Attach voltmeter negative lead to distributor base and positive lead to straight-pin in Black wire. With ignition switch in "RUN" position, measure voltage.
- If voltage reading was greater than .5 volt, proceed to DISTRIBUTOR GROUND CIRCUIT CONTINUITY test. If voltage was .5 volt or less, replace control module. After test, remove straight-pin.
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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.