Where is number 4 ignition coil on 2002 Lincoln ls?

The 2002 Lincoln LS uses a coil-on-plug system, meaning each cylinder has its own ignition coil mounted directly on top of the spark plug. There isn't a numbered "4" ignition coil in the traditional sense of a distributor-based system.

To locate the #4 cylinder's coil, you'll need to determine the firing order for the 2002 Lincoln LS's 3.0L or 3.9L V6 engine (the firing order will vary slightly between engines). Once you know the firing order, you can then locate the corresponding cylinder and its coil.

You should consult a repair manual specific to your 2002 Lincoln LS (either 3.0L or 3.9L engine) for the exact firing order and cylinder location. This manual will have diagrams showing the engine layout and coil pack locations. You can usually find these manuals online or at auto parts stores.

Trying to locate it without a diagram is difficult and risky, as misidentifying cylinders could lead to misdiagnosis or damage.