Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
This test is intended to diagnose the following:
- Spark Plugs
- Spark Plug wires
NOTE:
A malfunctioning ignition system may cause high catalyst temperatures. Check components next to catalyst and muffler for heat damage.
COIL PACK FIRING ORDERS
| Application | Firing Order |
|---|---|
| 4-Cylinder | 1-3-4-2 |
| V6 | 1-4-2-5-3-6 |
COIL-ON-PLUG FIRING ORDERS
| Application | Firing Order | |
|---|---|---|
| V6 | 1-4-2-5-3-6 | |
| V8 | ||
| LS & Thunderbird | 1-5-4-2-6-3-7-8 | |
| All Others | 1-3-7-2-6-5-4-8 | |
| V10 | 1-6-5-10-2-7-3-8-4-9 | |