Tests JB: Secondary Ignition

NOTE
This Pinpoint Test is intended to diagnose the following:
- Spark plugs
- Spark plug wires

CAUTION: A malfunctioning ignition system may cause high catalyst temperatures. Check components next to the catalyst and muffler for heat damage.

Pinpoint Test Schematics

Escort, Focus, Contour/Mystique, Cougar, Windstar, 3.0L (2V) Taurus/Sable, 3.8L Mustang, Ranger, Explorer/Mountaineer, 4.2L E/F-Series:

3.0L (4V) Taurus/Sable, 4.6L Mustang, Crown Victoria/Grand Marquis, LS6/LS8, Town Car, Continental, Expedition/Navigator, Excursion, 4.6L/5.4L E/F-Series, 6.8L E-Series:

Tables

All Others (Ignition To Cylinder Correlation And Firing Order):

Ignition Coil And Firing Order - Coil On Plug Applications:

Pinpoint Test Schematics