Denso 3238 Spark Plug

Reliable Ignition Performance for Select Vehicles

The Denso Double Platinum 3238 spark plug is engineered to deliver consistent ignition performance for a range of vehicles including Chevrolet, Honda, Nissan, and Subaru models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Double platinum electrodes for enhanced durability and stable spark
• Center electrode with copper core and platinum tip for optimal conductivity
• Ground electrode features a platinum chip with nickel core material
• Standard ground configuration with a single ground electrode
• Pre-gap size of 1.1 mm for precise ignition timing
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Hex size of 20.6 mm for easy installation
• Manufacturer heat range rating of 20 suitable for various driving conditions
• Resistance of 5000 ohms to reduce electrical noise interference

About the Denso Double Platinum Spark Plug Line

The Double Platinum line from Denso is designed to provide improved wear resistance and longer service life compared to conventional spark plugs. Featuring platinum on both the center and ground electrodes, these plugs maintain stable ignition performance over extended mileage. The 3238 part number exemplifies this technology, combining platinum tips with a copper core center electrode to balance conductivity and durability.

Technical Details and Compatibility

This spark plug is compatible with a variety of makes and models, including Chevrolet S10, Honda Accord and Civic, Nissan 200SX and Maxima, Subaru Impreza, and several Dodge and Mitsubishi vehicles. Its flat seat design and 19 mm reach ensure proper fitment in engines requiring these specifications. The 5000 ohm resistance helps minimize radio frequency interference, making it suitable for modern vehicles with sensitive electronics.

Common Applications and Problem Solving

• Restores consistent engine starting and smooth idling
• Reduces misfires caused by electrode wear or gap erosion
• Improves fuel efficiency by ensuring complete combustion
• Minimizes ignition system electrical noise affecting onboard electronics
• Extends spark plug service intervals with durable platinum tips

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 1.1 mm as specified. Use a torque wrench to tighten the plug to manufacturer-recommended torque values to avoid damage to the flat seat. The 20.6 mm hex size allows for standard spark plug socket compatibility. Inspect the threads and clean the cylinder head spark plug hole to ensure proper seating and prevent cross-threading.

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet strict OEM standards for quality and performance. The Double Platinum 3238 spark plug undergoes rigorous testing to ensure durability and reliable ignition. While specific warranty terms may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.