Ignition Coil & Iridium Spark Plugs for Toyota Sequoia (2008-2020) 4.6L 5.7L V8

Direct-Replacement Ignition Coil & Iridium Spark Plugs for 2008-2020 Toyota Sequoia

What it does: Restores factory combustion efficiency and eliminates engine misfires by replacing degraded OEM ignition coils and worn spark plugs with precisely matched, high-dielectric components.

The Stock 1UR-FE & 3UR-FE Ignition Weakness

The Toyota 4.6L and 5.7L V8 engines are exceptionally reliable, but the factory ignition system is highly susceptible to thermal degradation. Years of heavy thermal cycling inside the engine bay break down the epoxy potting within the OEM ignition coils. This leads to internal arcing, increased electrical resistance, and a significantly weakened spark. Simultaneously, standard factory spark plugs suffer from electrode erosion, widening the gap over time. This forces the coils to work harder to jump the gap, accelerating their failure. Symptoms typically present as rough idling, reduced towing capability, poor fuel economy, and persistent P0300-series misfire codes.

The Engineering Solution

This comprehensive ignition kit directly addresses these thermal and electrical vulnerabilities. The included ignition coils feature upgraded copper wire windings coated in high-temperature enamel, encapsulated in premium dielectric epoxy resin to prevent voltage leaks and resist heat soak. The boots utilize high-grade silicone to ensure a moisture-proof seal against the cylinder head, preventing flashover. Paired with fine-wire iridium spark plugs, this system requires less primary voltage to initiate a spark while providing a highly concentrated, consistent ignition event. The iridium alloy center electrode features an extremely high melting point, drastically reducing gap erosion and ensuring complete combustion even under heavy load or towing conditions.

Technical Specifications

Compatibility

• 2008-2020 Toyota Sequoia 4.6L V8
• 2008-2020 Toyota Sequoia 5.7L V8

The Toyota Durability Standard

For heavy-duty applications like the Sequoia, maintaining optimal ignition health is critical for preserving bottom-end torque and towing capability. This ignition kit ensures consistent power delivery, restoring factory reliability and keeping your rig out of the shop and on the road.