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.
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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.