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.
Ignition Coil Resistance
Disconnect leads from ignition coil. Using an ohmmeter, check ignition coil secondary resistance (secondary tower-to-secondary tower). Secondary resistance should be less than 10,000 ohms. Ignition coil primary resistance value is not supplied by manufacturer. If ignition coil is suspected of causing misfire or no-spark condition, switch coil locations on ignition module. If problem follows questionable coil, replace original coil.
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Use the Manual With the Right Hardware
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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.