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.
Ignition Timing Control: Notes
A microcomputer in the PCM controls the ignition timing according to engine speed and vacuum pressure in the intake manifold. Engine speed and vacuum pressure are transmitted to PCM by signals from crank sensor, cylinder (CYL) sensor, TDC sensor (Integra and Vigor), throttle position sensor, coolant temperature sensor, knock sensor(s), and MAP sensor.
The PCM contains memory for ignition timing at various engine speeds, manifold pressure and coolant temperature. When these conditions have been processed, PCM sends signals to ignitor unit to control ignition timing.
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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