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NGK 3653 Spark Plug
| Brand | NGK 3653 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Taper cut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .036 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 8 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 10.00 |
| Part Number | Imr8c-9h |
| Stock Number | 3653 |
| Fits | — |
Laser Iridium design. Iridium tip helps deliver precise, consistent ignition performance.
OE supplier heritage. Built by NGK, a long-time original equipment spark plug manufacturer.
Original equipment standards. Manufactured for durability and dependable operational performance.
Cross-references CSF 3653, Monroe Shocks & Struts 5626 and 31911-MBW-E11 for the same application. See all 5.
NGK Laser Iridium Spark Plug 3653
NGK Laser Iridium Spark Plug 3653 is built for precise ignition performance in modern gasoline engines that call for a 10 mm, flat-seat plug with a .75 reach and .036 pre-gap. The iridium center electrode and nickel ground electrode help support consistent spark delivery, while the 5,000 ohm resistor helps reduce electrical noise in the ignition system.
Key Features
- Laser Iridium design with an iridium center electrode tip
- Nickel ground electrode with taper-cut tip design
- 5,000 ohm resistor for ignition noise suppression
- 10 mm thread diameter, .75 reach, and flat seat
- Pre-gapped to .036 for direct replacement service
- 5/8 hex size and stud terminal type
- Heat range 8 for specified engine applications
Product Details
NGK part number 3653, also identified as IMR8C-9H, is part of the Laser Iridium Spark Plug line. NGK’s OE-focused manufacturing background and broad coverage across domestic and import vehicles make this spark plug a practical choice for drivers and technicians looking for an OE-style replacement. For applications such as Honda Civic service work, this plug supports stable ignition performance where the engine calls for the listed dimensions and heat range. This part number 3653 is also referenced by CSF 3653 for the same application.
Common Issues This Spark Plug Can Address
- Hard starting caused by worn or fouled spark plugs
- Misfire conditions related to weak spark delivery
- Rough idle from inconsistent ignition performance
- Reduced fuel economy tied to degraded plug condition
- Engine hesitation during acceleration
Installation Notes
Verify thread diameter, reach, seat type, heat range, and pre-gap before installation. Use the correct torque specification for the engine and inspect the ignition coil, boots, and wires during service. Confirm vehicle application details for Honda Civic fitment and other listed applications before replacing the plug. Part number 3653 should be matched to the engine’s required plug specification, including the IMR8C-9H reference.
Quality Assurance
NGK is a long-established OE supplier with extensive North American and global manufacturing and distribution support. Its spark plug lineup is built to original equipment standards for durability and consistent operation across a wide range of automotive applications.
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| No rows match your filter. | ||||