NGK 4830 Spark Plug

NGK DPR9Z Spark Plug for Reliable Ignition

The NGK Standard Spark Plug, part number 4830, is built for consistent ignition performance in a wide range of domestic and import applications. As a copper-core, nickel-tipped spark plug with a 0.028 pre-gap, it supports stable spark delivery for engines that call for this specification.

NGK 4830 is a practical OE-style replacement for drivers searching for a standard spark plug for Honda Civic, Toyota Corolla, and similar passenger vehicles where the correct heat range and thread dimensions matter. The DPR9Z design reflects NGK’s long history as an OE supplier for automotive ignition components.

Key Features

• NGK Standard Spark Plug, part number 4830
• Part number DPR9Z for direct reference
• Copper center electrode core for dependable conductivity
• Nickel center electrode tip and nickel ground electrode tip
• Standard ground electrode design with one ground electrode
• 5,000 ohm resistor for ignition noise suppression
• 0.028 pre-gap size for specified applications
• 12 mm thread diameter, 0.75 reach, flat seat
• 18 mm hex size and stud terminal type
• Manufacturer heat range 9

Product Details

NGK builds this spark plug to original equipment standards, drawing on more than 80 years of ignition engineering and broad OE coverage across automotive, motorcycle, marine, and small engine applications. The copper-core construction helps support efficient spark transfer, while the nickel electrode materials provide a conventional serviceable design for engines that use a standard plug configuration. If you are replacing worn plugs in a Honda Civic, Toyota Corolla, or another vehicle specified for DPR9Z, NGK 4830 offers the correct dimensions and heat range for the application.

This part cross-references AMS Automotive 4117 for the same application.

Common Problems This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire conditions related to electrode wear
• Reduced fuel economy from degraded ignition performance
• Engine hesitation during acceleration

Installation Notes and Tips

Verify the required plug specification, including thread diameter, reach, seat type, and heat range, before installation. Check and confirm the gap against the vehicle service information before use, since pre-gap settings can vary by engine application. Use proper spark plug removal and installation procedures to avoid thread damage in the cylinder head, and inspect ignition wires or coils at the same time if the old plug shows signs of carbon tracking or excessive wear.

Quality Assurance

NGK is a major OE supplier and manufacturer of spark plugs in North America, with global manufacturing and distribution support. The brand’s OE-focused engineering and long-standing ignition expertise back the design of the DPR9Z / 4830 spark plug for dependable service in specified applications.