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NGK 3901 Spark Plug
| Brand | NGK 3901 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Standard |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | .036 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 7 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 10.00 |
| Part Number | Cpr7ea-9 |
| Stock Number | 3901 |
| Fits | — |
OE legacy. Built to original equipment standards for dependable performance.
Copper core. Helps promote consistent ignition and reliable operation.
Standard design. A straightforward spark plug for broad automotive, marine, and small engine use.
Cross-references Atlantic Automotive Engineering 3901, 09482-00621 and 31917-KPH-901 for the same application. See all 6.
NGK CPR7EA-9 Standard Spark Plug
The NGK CPR7EA-9 standard spark plug is built for dependable ignition performance in a wide range of gasoline engines. As part of NGK’s Standard Spark Plug line, it uses a copper core center electrode, nickel tip materials, and a 5,000 ohm resistor to support stable spark delivery and reduced electrical noise.
Key Features
- NGK Standard Spark Plug, part number 3901
- CPR7EA-9 configuration with flat seat design
- Copper core center electrode with nickel tip material
- Nickel ground electrode with standard tip and standard configuration
- 5/8 hex size, 10.00 mm thread diameter, and .75 reach
- Pre-gapped at .036 for common service applications
- Stud terminal type for direct ignition connection
- Manufacturer heat range 7
Product Details
NGK’s Standard Spark Plug line is focused on OE-style construction and consistent service life across domestic and import applications. Part number 3901 is engineered with a copper core center electrode for efficient heat transfer, a nickel center tip, and a nickel ground electrode to support reliable combustion in everyday driving conditions. The CPR7EA-9 specification, flat seat, and .036 pre-gap make this spark plug a practical replacement choice for routine ignition service. This part cross-references Atlantic Automotive Engineering 3901 for the same application.
For shoppers searching for a spark plug for Honda Civic or similar small-engine and import vehicle applications, NGK 3901 is a direct-fit style replacement where the vehicle calls for CPR7EA-9. It is also a relevant search match for drivers looking for NGK CPR7EA-9 spark plug, NGK 3901 spark plug, or standard replacement spark plug for Honda Civic applications.
Common Issues This Part Helps Address
- Hard starting caused by worn or fouled spark plugs
- Rough idle from inconsistent spark delivery
- Misfire conditions related to electrode wear
- Reduced fuel efficiency from weak ignition performance
- Engine hesitation during acceleration
Installation Notes and Tips
Verify the vehicle’s required plug code, seat type, thread diameter, reach, and heat range before installation. Confirm the gap specification against the engine service information, even when the plug is pre-gapped. Use proper torque procedures and inspect the ignition system, including coils and wires, if misfire symptoms are present. This spark plug is a fitment-specific service part for vehicles calling for CPR7EA-9, including Honda Civic applications where specified.
Quality Assurance
NGK is a long-established OE supplier with extensive North American coverage and manufacturing experience across automotive, motorcycle, marine, and small-engine ignition products. Part number 3901 is produced to support original-equipment-level durability and operational consistency in service applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| No rows match your filter. | ||||