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Home >> Cadillac >> 1985 >> Seville 5.7 N >> Repair and Diagnosis >> Engine Performance >> Ignition System - HEI-Est >> Testing >> Ignition System Check >> Notes

Ignition System Check: Notes

NOTE: Before testing, obtain spark tester (ST-125). If tachometer is connected to ignition coil "TACH" terminal, disconnect it before performing tests. Use digital voltmeter with 10 megohms or greater impedance.
CAUTION: When removing spark plug wire from spark plug, twist boot on spark plug and pull on boot, NOT on wire.