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.
Spark Check
Check EEC-IV system for fault codes and repair if necessary. See Quick Test procedure in the appropriate TESTS W/CODES article in this section. If no fault codes are retrieved and vehicle is a no-start, using a Neon Bulb Spark Tester (D89P-6666-A), check for spark at each spark plug wire while cranking. If spark is consistent and equal at each spark plug (one spark per crankshaft revolution), go to appropriate ignition system in the appropriate SYSTEM/COMPONENT TESTS article in this section.
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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