A secondary ignition oscilloscope pattern is being analyzed. The voltage spikes of cylinders #1, #2, and #3 are 9 to 12 kV while cylinder #4 is 35 kV. What is the most likely cause of this?
A. open plug wires for cylinders #1, #2, and #3
B. shorted spark plug
C. grounded plug wires
D. open plug wire for cylinder #4
Answer: D
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