Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 744 (ENGINE IGNITION SYSTEM - 4.2L - F-150)DESCRIPTION AND OPERATIONENGINE IGNITION
2005 Ford Taurus SEL, 4D Sedan
Engine Ignition
2005 Ford Taurus SEL, 4D SedanSECTION Engine Ignition
WARNING: This page is about a different car, the 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The electronic ignition (EI) system consists of the:
- crankshaft position sensor.
- ignition coil.
- spark plug wires.
- spark plugs.
The crankshaft position sensor:
- is a variable reluctance sensor.
- is mounted on the engine front cover.
- is triggered by a 36-minus-1 tooth trigger wheel located on the crankshaft pulley and damper.
- provides base timing and crankshaft speed (rpm) to the powertrain control module (PCM).
Refer to ELECTRONIC ENGINE CONTROLS article.
The ignition coil:
- is controlled by the PCM.
- fires 2 spark plugs simultaneously.
- is mounted on the RH valve cover.
The spark plug wires:
- carry high voltage pulses from the ignition coil to the spark plugs.
The spark plugs:
- ignite the fuel and air mixture.
- are nickel enhanced for long life.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.