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 computer ignites lean air/fuel mixtures according to different engine conditions. It provides an infinite number of variable advance curves.The computer receives signals from engine sensors. It analyzes the signals to determine engine operating condition and then adjusts ignition timing.
The computer determines when ignition is required, and signals the ignition coil to produce an electrical impulse to fire the spark plugs. The computer is part of the engines air intake duct, located on the fenderwell. Engine sensors include a vacuum transducer (mounted on the computer housing), Hall Effect pick-up assembly, engine coolant temperature sensor, carburetor switch (if equipped), and an oxygen sensor.
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.