Here is what I go by,
0 - 15" min 3000 ohms, max 10000 ohms.
15 - 25" min 4000 ohms, max 15000 ohms.
25 - 35" min 6000 ohms, max 20000 ohms.
Over 35" min 8000 ohms, max 25000 ohms.
You can check the ignition module (coil) with a digital volt/ohm meter for a start. Check the primary and secondary circuits resistance and go from there. You can also check the spark plug wires resistance with the same meter.
Spark plug wires
The resistance measured under low voltage conditions should be infinite. High voltage ... like that that produces the spark ... behaves differently.
Briggs & Stratton Ignition Coils have NO documented measurement for the primary windings, however readings of between 0.3 and 0.7 ohms are common. The secondary windings should measure between 2K and 4K (including the resistance of the spark lead)
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You apply 12 volts to the coil primary and then release it . The electricity will go through the secondary coil and spark the spark pug.
14-16Kohm / metre
What might cause low maximum secondary coil voltage?Low primary input voltageLow primary resistanceWide spark plug gapsOpen spark plug wire
What might cause low maximum secondary coil voltage?Low primary input voltageLow primary resistanceWide spark plug gapsOpen spark plug wire
Usually 10,000 ohms per foot.
What might cause low maximum secondary coil voltage?Low primary input voltageLow primary resistanceWide spark plug gapsOpen spark plug wire
Check ignition coil primary and secondary resistance using an ohmmeter. Check for burned distributor rotor. Check for faulty igniter if so equipped. Also, for more answers try asking this question again but replace "prism" with "corolla."