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 MANUALSMERCURY2010MOUNTAINEER 2WD V6-4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMDESCRIPTION AND OPERATIONENGINE IGNITION
2010 Mercury Mountaineer 2WD V6-4.0L
Engine Ignition
2010 Mercury Mountaineer 2WD V6-4.0LSECTION Engine Ignition
Engine Ignition
The ignition system consists of the following:
- Crankshaft Position (CKP) sensor
- Ignition coil
- Spark plug wires
- Spark plugs
The CKP 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 damper pulse ring.
- provides ignition timing and crankshaft speed to the PCM.
The ignition coil:
- changes low-voltage pulses from the PCM to high-voltage pulses.
- fires 2 spark plugs simultaneously.
- has 3 transformers.
- One transformer fires the spark plugs for cylinders 1 and 5
- One transformer fires the spark plugs for cylinders 2 and 6
- One transformer fires the spark plugs for cylinders 3 and 4
Spark plug wires:
- carry high-voltage pulses from the ignition coil to the spark plugs.
The spark plugs:
- change high-voltage pulses to spark at the gap, which ignites the fuel and air mixture.
The firing order is 1-4-2-5-3-6.
Coil Terminal-to-Cylinder Relationship
RENDER: 1.0x
NO RELATED
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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.