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2003 Ford 3.9L VIN A - Coil Primary Voltage COP Patterns

Rusty Owner/Technician Indiana Posted  
Resource
Driveability
Electrical
2003 Ford Thunderbird 3.9L (A) 5-spd (5R55S)
P0304 — Cylinder 4 Misfire Detected
Misfire

Scope patterns looking closely at the primary voltage during coil saturation by comparing the cylinder 4 vs cylinder 2.

diag​.​net/file/f56hx6k93… ​

diag​.​net/file/f5f6pj6iq… ​

Cyl - 2 = Good  ​

Cyl - 4 = Bad​

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Automotive diagnostic tools for professional technicians, shop owners, and educators. Corporate Partner