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.
System Performance Check: Notes
Since it is not possible to store a code for every possible problem, one may develop in which the "CHECK ENGINE" light does NOT come on. If C-4 system is suspected, make a System Performance Check, using a dwell meter, ohmmeter, test light, voltmeter, tachometer, vacuum gauge and jumper wires. Refer to "System Performance Check" chart later in this article.
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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