Champion 9804 Spark Plug - Intake Side

Champion Iridium Spark Plug 9804

Champion Iridium 9804 is a secondary ignition spark plug built for precise spark delivery and stable combustion. It uses a fine-wire iridium center electrode with a platinum ground electrode to sharpen spark focus and support consistent performance in a wide range of import and domestic applications.

Key Features

• Fine-wire iridium center electrode for focused spark initiation
• Platinum ground electrode with J-gap design
• Pre-gapped to 0.030 in for straightforward service setup
• Resistor-type plug for ignition noise control
• Flat seat design with 0.75 in reach
• 14 mm thread diameter and 0.813 in hex size
• Champion Iridium classification with plug type RN8WYPB3

Product Details

Champion Iridium 9804 is part of the Champion Iridium line, a spark plug family focused on precise ignition performance through durable electrode materials and controlled spark exposure. The iridium center electrode and platinum ground electrode help maintain a sharp spark point, while the J-gap configuration supports consistent flame kernel formation. This plug cross-references NGK 3903 and 4055 for the same application.

Compatible applications include Mitsubishi Lancer, Mitsubishi Eclipse, Hyundai Sonata, Hyundai Elantra, Porsche 928, Porsche 944, Volvo 240, Volvo 740, Audi 80, and Land Rover Range Rover. It also appears in fitment for vehicles such as Porsche 911, Volkswagen Golf, Nissan Pathfinder, and Honda Civic across the listed model years.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from degraded ignition performance
• Service issues on vehicles calling for RN8WYPB3 plug type

Installation Notes and Tips

• Verify the required plug type, reach, seat style, and thread diameter before installation.
• Confirm the specified gap for the exact vehicle application; listed fitments include gaps such as 0.024 in, 0.028 in, 0.032 in, 0.035 in, 0.040 in, and 0.044 in depending on model.
• Use the correct torque procedure for flat-seat spark plugs to avoid thread or sealing damage.
• Check ignition wires, coils, and distributor components during plug service to maintain consistent spark delivery.

Quality Assurance

Champion designs this spark plug with iridium and platinum electrode materials for durable ignition performance and stable spark focus. The RN8WYPB3 plug type and resistor construction support OE-style service requirements across the listed applications.