Ignition Coil & Iridium Spark Plugs for Lexus GX470 (2003-2009) 4.7L V8

Direct-Replacement Ignition Coils & Iridium Plugs for 2003-2009 Lexus GX (2UZ-FE / J120)

Restores proper combustion and eliminates misfire codes by replacing fatigued factory coils and plugs with high-energy units.

The Stock GX Ignition Degradation

The original ignition system on the 4.7L 2UZ-FE engine is notorious for thermal fatigue. Constantly subjected to extreme underhood temperatures, the factory coil packs suffer from internal winding breakdown and degraded epoxy. Over time, continuous heat cycling increases electrical resistance, leading to weak spark, rough idling, and persistent P0300-series misfire codes. Worn factory plugs further strain the failing coils by requiring higher voltage to bridge the widened gap.

The Engineering Solution

This kit provides a complete mechanical remedy by pairing high-output ignition coils with performance iridium spark plugs. The coils feature upgraded copper windings insulated by a high-dielectric epoxy resin to prevent voltage leaks and withstand severe heat soak in the J120 engine bay. Integrated silicone boots offer superior moisture resistance, preventing flashover. The matched iridium spark plugs utilize an ultra-fine center electrode requiring less voltage to fire, ensuring a highly concentrated spark kernel. This stabilizes idle, restores crisp throttle response, and optimizes combustion efficiency under load.

Technical Specifications

Compatibility

• 2003 Lexus GX470 4.7L V8
• 2004 Lexus GX470 4.7L V8
• 2005 Lexus GX470 4.7L V8
• 2006 Lexus GX470 4.7L V8
• 2007 Lexus GX470 4.7L V8
• 2008 Lexus GX470 4.7L V8
• 2009 Lexus GX470 4.7L V8

The Lexus Durability Standard

Engineered for the demanding environments trucks and SUVs face, this ignition upgrade ensures your GX retains its legendary towing capability and overland reliability. It guarantees smooth power delivery whether you are navigating technical trails or pulling a heavy load on the highway.