Ignition Coil and Iridium Spark Plugs for Volvo XC90 (2005-2011) 4.4L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2005-2011 Volvo XC90 4.4L V8

Primary Function: Restores factory secondary ignition voltage and combustion efficiency across all eight cylinders on the transverse Yamaha-engineered B8444S V8.

The Stock XC90 Ignition Degradation

The compact 60-degree B8444S engine bay configuration subjects the rear cylinder bank to extreme thermal cycling and trapped engine heat. Over time, OEM coil-on-plug boots experience dielectric breakdown, micro-arcing, and internal copper winding degradation. Combined with worn factory spark plug gaps, this leads to secondary ignition misfires under load, rough idling, hesitation during throttle tip-in, and premature catalytic converter fouling.

The Engineering Solution

This complete 8-cylinder service kit pairs high-grade coil-on-plug assemblies with fine-wire iridium spark plugs. The coils feature reinforced internal copper windings, premium potting epoxy for maximum thermal isolation, and direct-fit OE blade terminals for low electrical resistance. The paired iridium plugs deliver superior spark kernel stability, resist fouling under high combustion pressures, and maintain exact electrode gap tolerances far longer than standard nickel or platinum alternatives.

Technical Specifications

Compatibility

• 2005-2011 Volvo XC90 Base 4.4L V8
• 2006-2011 Volvo XC90 V8 Sport / R-Design 4.4L V8
• 2007-2011 Volvo XC90 Executive 4.4L V8

The Volvo Precision Standard

Engineered to meet exact European OBD-II diagnostics tolerances, these coils prevent erratic ionization feedback and eliminate false-positive misfire check engine lights (CEL), ensuring seamless throttle response, smooth cold starts, and reliable highway cruising.