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, STANDARD, M5OD-R2REPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - TFI-IVTESTINGIGNITION COIL PRIMARY RESISTANCE
1988 Ford Bronco 4.9 Y, Standard, M5OD-R2
Ignition Coil Primary Resistance
1988 Ford Bronco 4.9 Y, Standard, M5OD-R2SECTION Ignition Coil Primary Resistance
- With ignition switch in "OFF" position, disconnect ignition coil connector. Inspect connector for dirt, corrosion or damage. Measure resistance across ignition coil positive and negative terminals. See Figure.
- Resistance should measure .3-1.0 ohm. If so, ignition coil primary circuit is okay. Proceed to IGNITION COIL SECONDARY RESISTANCE test. If resistance is less than .3 ohm or greater than one ohm, replace ignition coil.
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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.