Coil Output Check
Connect oscilloscope to engine. Start engine and observe secondary voltage. Remove No. 2 spark plug wire from distributor cap to create open circuit. Run engine at 1000 RPM. Observe voltage on oscilloscope. The voltage, referred to as open circuit voltage, should be 24,000 volts minimum.
NOTE:
Do not operate engine with spark plug disconnected for more than 30 seconds or damage may result to catalytic converter.