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.
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HOMESERVICE MANUALSMAZDA1991323 L4-1600 1597CCREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINETUNE-UP AND ENGINE PERFORMANCE CHECKSDISTRIBUTORDESCRIPTION AND OPERATION
1991 Mazda 323 L4-1600 1597cc
Distributor: Description and Operation
1991 Mazda 323 L4-1600 1597ccSECTION Description and Operation
Distributor:
The distributor, mounted to the left end of the cylinder head and driven by the camshaft, directs high voltage ignition coil output to the spark plugs in proper sequence (firing order). To accomplish this, a rotor on the driven shaft acts as a rotary contact, directing ignition coil voltage to each spark plug terminal as it turns inside the distributor cap.
The distributor utilizes a photo-diode type crank angle sensor consisting of a slotted disc that turns with the distributor shaft and a stationary pick-up assembly. As the disc rotates past the pick-up, the slots (one for each cylinder) alternately pass and block photo-diode light transmission. Signals generated are interpreted by the ECU to determine crank angle (#1 cylinder TDC) and engine rpm. To calculate ignition timing, the ECU uses this input together with several others related to vehicle operating conditions. Except for the initial setting, ignition timing is under ECU control.
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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.