Ignition Coil + Spark Plugs for Infiniti M45 (2003-2004, 2006-2010) 4.5L

High-Dielectric Ignition Coil and Spark Plug Kit for Infiniti M45 (Y34 / Y50)

What it Does: The ignition coil and spark plug kit replaces aged secondary ignition components on the Infiniti M45 to eliminate high-load misfires, stabilize idle, and restore peak combustion efficiency.

The Stock Infiniti M45 Heat Degradation and Dielectric Breakdown

The naturally aspirated 4.5L VK45DE V8 runs tightly packed cylinder banks where prolonged thermal cycling cooks the factory coil-on-plug boots and internal copper windings. Over time, heat exposure causes the OEM epoxy resin to micro-fracture and secondary boot silicone to harden, allowing high-voltage secondary current to arc directly to the cylinder head rather than across the plug gap. Coupled with electrode erosion on aging spark plugs that widens the gap and increases firing demand, the stock ignition system suffers from random high-RPM misfires (DTC P0300-P0308), rough idle, delayed throttle tip-in, and catalytic converter damage from unburned fuel.

The Engineering Solution

This refresh package delivers eight matched direct-fit ignition coils paired with precise-gap spark plugs engineered to withstand severe thermal saturation. The coils feature reinforced thermoplastic housings vacuum-potted in high-grade dielectric epoxy, preventing micro-arcing and internal winding breakdown under high duty cycles. High-temp silicone boots with internal stainless steel suppression springs maintain positive contact against the spark plug terminals. Matched with fine-wire spark plugs designed to minimize arc voltage requirements, this kit restores crisp combustion, sharp throttle response, and smooth power delivery throughout the rev range.

Technical Specifications

Compatibility

• 2003 Infiniti M45 Base 4.5L V8 (VK45DE / Y34)
• 2004 Infiniti M45 Base 4.5L V8 (VK45DE / Y34)
• 2006 Infiniti M45 Base / Sport 4.5L V8 (VK45DE / Y50)
• 2007 Infiniti M45 Base / Sport 4.5L V8 (VK45DE / Y50)
• 2008 Infiniti M45 Base / Sport / X 4.5L V8 (VK45DE / Y50)
• 2009 Infiniti M45 Base / Sport / X 4.5L V8 (VK45DE / Y50)
• 2010 Infiniti M45 Base / Sport / X 4.5L V8 (VK45DE / Y50)

Frequently Asked Questions

Does this fit the Y34 and Y50 M45?

Yes, this is a direct fit for the Infiniti M45 equipped with the VK45DE 4.5L V8 across both the Y34 (2003-2004) and Y50 (2006-2010) chassis generations.

Should spark plugs be replaced at the same time as ignition coils?

Yes, replacing both ensures identical electrical resistance across all eight cylinders and prevents worn plug gaps from overloading new coil secondary windings.

The Infiniti High-Displacement Standard

The high-revving VK45DE demands uncompromising ignition precision to lay down smooth V8 torque and maintain clean wide-open-throttle acceleration without hesitation.