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 Control System: Operation: CARBURETED: Notes
The Justy distributor is equipped with both vacuum and electrical advance. Electrical advance is constantly operative, and is controlled by Ignition Timing Unit (ITU). On all other models, distributors are equipped with vacuum advance only. Vacuum advance on both systems is controlled by engine vacuum. The Justy system is equipped with a dual-diaphragm advance unit. Intake manifold vacuum is applied to auxiliary side of distributor vacuum control unit during idle, low-load operation and deceleration in order to provide an advance angle.
Vacuum produced in advance port is applied to main diaphragm side in relation to opening angle of throttle valve. This main advance provides additional advance angle. See Fig 1 .
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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.