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 Control Computer
The Spark Control Computer (SCC) is located on the air cleaner assembly. It gives the system the capability of igniting a lean air/fuel mixture according to different modes of engine operation by delivering an infinitely variable advance curve. The computer determines optimum ignition advance.
The SCC signals the ignition coil to produce the voltage required for ignition purposes. The voltage produced is based on the demands of air/fuel ratio, air and coolant temperature, load and RPM. The computer consists of one electronic printed circuit board which receives signals from all the sensors and computes the appropriate ignition advance. Computer reaction time is measured in milliseconds.
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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.