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.
Preliminary Testing Procedures
Before testing, obtain Spark Tester (ST-125). See Fig 1 and Fig 2 . If factory tachometer is connected to ignition coil tachometer terminal, disconnect it before performing tests. When performing tests, use digital voltmeter with at least 10-megohm input impedance. When removing spark plug wire from spark plug, twist and pull on boot, NOT on wire.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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