Ford Mustang (1999-2004) Service Manual: Engine Ignition (Description and Operation)
The ignition coil (12029), which is mounted on the upper intake manifold, can be described as a coil pack containing three separate coil units. Each coil unit is individually controlled by the powertrain control module (PCM) (12A650) through separate wire leads. Each coil unit activates two spark plugs wired in a series by the spark plug wires (12286).
- One spark plug activates on the compression stroke and uses the majority of the ignition coil's stored energy.
- The other spark plug activates on the exhaust stroke and uses very little of the ignition coil's stored energy.
- Because the pairs of spark plugs are connected in a series, one spark will travel from ground to the electrode while the other spark will travel from the electrode to ground.
The spark plug (12405):
- changes the high voltage pulse into a spark which ignites the fuel and air mixture.
- originally equipped on the vehicle has a platinum-enhanced active electrode for long life.
The crankshaft position (CKP) sensor (6C315):
NOTE: Initial engine ignition timing is set at 10 degrees +- 2 degrees before top dead center (BTDC) and is not adjustable.
- is a variable reluctance sensor triggered by a 36-minus-1 tooth trigger pulse wheel located on the crankshaft (6303) inside the engine front cover (6019).
The sine wave type signal generated from the crankshaft position sensor provides two types of information:
- position of the crankshaft in 10 degree increments
- the crankshaft speed (rpm)
The powertrain control module (PCM) (12A650) uses this information to determine ignition coil turn ON and turn OFF times and misfire detection.
Engine Ignition (DIAGNOSIS AND TESTING)
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
Engine Ignition - 3.8L
General Specifications
Torque Specifications
...
Ignition Coil
Material
Item
Specification
Silicone Brake Caliper Grease
and Dielectric Compound
D7AZ-19A331-A or equivalent
ESE-M1C171-
A
Removal and Installation
1. Disconnect the battery ...
Other materials:
Cable and Bracket
Removal
1. Raise the vehicle on a hoist. For additional information, refer to
Section.
2. Remove the cable shift from the shifter lever and bracket and discard
the clip.
3. Remove the bolt from the cable.
4. Remove the bolt from the cable.
5. ...
Parking brake
WARNING: If the parking brake is fully released, but the brake
warning lamp remains illuminated, the brakes may not be
working properly. See your authorized dealer as soon as possible.
WARNING: Always set the parking brake fully and make sure
that the transmis ...
Final assembly
23. Install the differential assembly in the differential housing. For
additional information, refer to
Differential Case in this section.
24. CAUTION: Align the index marks.
CAUTION: Install the driveshaft with new bolts. If new bolts are not available,
a ...