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NGK 6588 Spark Plug
| Brand | NGK 6588 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Taper cut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Non-removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .044 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.50 |
| Manufacturer Heat Range | 9 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 14.00 |
| Part Number | Ifr9h11 |
| Stock Number | 6588 |
| Fits | — |
Laser Iridium design. Iridium center electrode for precise ignition and long service life.
Copper core construction. Promotes efficient heat transfer for consistent spark plug performance.
Flat seat spark plug. Standard configuration for a secure, OE-style installation.
Cross-references Airtex Fuel Pumps 6588, Monroe Shocks & Struts 5630 and 31919-MEB-671 for the same application. See all 4.
NGK Laser Iridium Spark Plug 6588
NGK 6588 is a Laser Iridium spark plug built for precise ignition performance in a wide range of domestic and import applications. It combines an iridium center electrode with a nickel ground electrode and a 0.044 in. pre-gap for stable spark delivery and consistent combustion.
For drivers searching for an NGK spark plug for Honda Civic or Toyota Corolla service, this Laser Iridium design supports OE-style replacement needs with the fit and specifications expected from a secondary ignition component. Part number IFR9H11 is also identified by stock number 6588.
Key Features
- Laser Iridium center electrode tip for durable spark delivery
- Nickel ground electrode with standard configuration
- Taper-cut ground electrode tip design
- 0.044 in. pre-gap size
- 5000 ohm resistance
- 14 mm thread diameter, 0.75 in. reach, flat seat
- 5/8 in. hex size for standard service tools
- Non-removable nut terminal
Product Details
NGK Laser Iridium Spark Plug 6588, part number IFR9H11, is engineered with a copper core center electrode and an iridium tip to support reliable ignition performance under normal operating conditions. The 9 heat range, flat seat, and 0.75 inch reach make it a technical match for applications that specify these dimensions. NGK’s long OE supply history and North American manufacturing and distribution network support consistent product availability and specification control.
This part cross-references Monroe Shocks & Struts (e.g., 5630) for the same application.
Common Issues This Part Addresses
- Hard starting caused by worn spark plug electrodes
- Rough idle from inconsistent spark output
- Misfire conditions related to plug wear or incorrect gap
- Reduced throttle response from degraded ignition performance
- Service intervals requiring OE-style spark plug replacement
Installation Notes and Tips
Verify thread diameter, reach, seat type, heat range, and terminal style before installation. Set the gap to the specified 0.044 in. only if the application requires adjustment, and use the correct 5/8 in. spark plug socket during service. For Honda Civic and Toyota Corolla applications, confirm the engine code and model year against the vehicle’s service information before installation.
Quality Assurance
NGK is a major OE spark plug supplier with decades of automotive manufacturing experience. Part number 6588 is produced to support original-equipment-level dimensional and performance requirements for ignition service.
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