Ignition Coil and Iridium Spark Plugs for Ford Explorer (2009-2010) 4.0L
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OEM-Spec Ignition Service Kit for 2009-2010 Ford Explorer
What it Does: Restores factory secondary ignition voltage and combustion efficiency across all cylinders on the 4.0L SOHC V6 platform.
The Stock Explorer Ignition Degradation
Factory ignition coils and degraded spark plugs on the 4.0L Cologne V6 suffer from thermal breakdown, epoxy casing micro-cracking, and dielectric puncture over extended service intervals. Sustained underhood heat cycling deteriorates internal copper winding resistance, resulting in secondary voltage drop-off, intermittent misfire codes (P0300–P0306), unburned fuel loading catalytic converters, and rough idle under load.
The Engineering Solution
This complete ignition refresh kit pairs six heavy-duty ignition coil assemblies with six fine-wire iridium spark plugs. The coils utilize high-grade internal copper windings and high-dielectric epoxy potting to prevent internal flashover and maintain stable dwell times. The laser-welded iridium electrode configuration lowers the required breakdown voltage, resisting thermal erosion and ensuring rapid flame kernel propagation under heavy torque demands.
Technical Specifications
| Fitment | 2009-2010 Ford Explorer |
| Engine / Chassis | 4.0L Cologne SOHC V6 / U251 |
| Stock Output | 210 hp / 254 lb-ft (Approx) |
| Part Number | UF406, FD502, DG500, UF-406 |
Compatibility
- 2009 Ford Explorer (Eddie Bauer, Limited, XLT) 4.0L V6
- 2010 Ford Explorer (Eddie Bauer, Limited, XLT) 4.0L V6
The Ford Utility Standard
Designed to meet the sustained thermal and electrical loads of towing and daily utility use, this ignition kit eliminates misfire-induced hesitation to maintain consistent low-end torque delivery and optimal fuel economy.
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