Ignition Coil and Iridium Spark Plugs for Volvo S80 (2007-2010) 4.4L
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Direct-Replacement Ignition Kit for 2007-2010 Volvo S80
What it Does: Replaces degraded factory coil packs and worn spark plugs with high-output coil-on-plug assemblies and fine-wire iridium plugs to restore precise secondary ignition timing and combustion efficiency.
The Stock S80 Ignition Breakdown
The compact 60-degree B8444S V8 engine generates intense thermal cycling within tight cylinder head spark plug wells. Over time, heat soak breaks down OEM epoxy insulation and hardens silicone boots, causing high-voltage dielectric leakage, intermittent spark dropouts under load, rough idling, and persistent P0300-P0308 misfire codes as factory spark plug gaps widen.
The Engineering Solution
This 8-cylinder refresh kit pairs direct-fit ignition coils featuring dense internal copper windings with corrosion-resistant blade terminals and high-grade silicone boots. Combined with fine-wire iridium spark plugs, the setup requires lower ionization voltage, promotes stable flame kernel propagation, withstands extreme thermal stress, and restores factory dwell response across all engine loads.
Technical Specifications
| Fitment | 2007-2010 Volvo S80 |
| Engine / Chassis | B8444S 4.4L V8 / P3 (AS) |
| Stock Output | 311 hp / 325 lb-ft (Approx) |
| Part Number | UF574, 8687939, 8689939, 1788348 |
Compatibility
- 2007 Volvo S80 4.4L V8 AWD
- 2008 Volvo S80 4.4L V8 AWD
- 2009 Volvo S80 4.4L V8 AWD
- 2010 Volvo S80 4.4L V8 AWD
The Volvo Precision Standard
Engineered to meet stringent European powertrain tolerances, this kit ensures balanced cylinder-to-cylinder ignition performance, clean throttle tip-in, and reliable zero-misfire operation without triggering Check Engine Lights.
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