Testing Coil-on-Plug Units on a 2000 Lincoln LS

Tools: Digital multimeter (ohms), spark tester, scan tool (optional).

1. Remove engine cover; unplug each coil connector.
2. Primary resistance: Meter between coil pins 1 & 2 (harness side). Spec: 0.5–2.0 Ω.
3. Secondary resistance: Meter between coil tower (spark plug contact) and pin 1. Spec: 5–25 kΩ.
4. Spark test: Connect spark tester to coil tower; crank engine. Strong blue spark = good.
5. Swap suspect coil with a known-good cylinder; if misfire follows coil, replace it.

Torque coil bolt to 8–10 Nm on reinstall.