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NGK 91909 Spark Plug
| Brand | NGK 91909 |
|---|---|
| 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 | 14 |
| Insulator Height | 49.00 |
| Manufacturer Heat Range | 8 |
| Seat Type | Flat |
| Reach | 26.5 |
| Thread Diameter | 10.00 |
| Part Number | Lmar8bi-9 |
| Stock Number | 91909 |
| Fits | — |
Laser iridium design. Iridium tip and copper core help deliver reliable ignition performance.
OE supplier heritage. Built by NGK, a long-time original equipment spark plug manufacturer.
Standard spark plug. Flat seat and stud terminal for a straightforward replacement fit.
Cross-references NGK 91909 and 09482-00635 for the same application. See all 2.
NGK Laser Iridium Spark Plug 91909
NGK 91909 is a Laser Iridium spark plug built for precise ignition performance in modern gasoline engines. It uses an iridium center electrode, a copper core, and a tapered-cut nickel ground electrode to support consistent spark delivery and stable combustion.
The Laser Iridium line focuses on OE-style durability and accurate fitment details, making this plug a strong choice for drivers searching for an NGK spark plug 91909 replacement or a direct-fit ignition service part for select Honda Civic and Toyota Corolla applications.
Key Features
- Laser Iridium spark plug from NGK
- Part number 91909; manufacturer number LMAR8BI-9
- Iridium center electrode tip for durable spark performance
- Copper core center electrode for heat transfer support
- 5000 ohm resistor for ignition noise suppression
- Standard ground configuration with one ground electrode
- Taper-cut ground electrode tip design
- Flat seat, 10.00 mm thread diameter, 26.5 reach, 14 mm hex
- Pre-gapped at .036
Product Details
NGK builds this spark plug to OE standards and supplies ignition components for a wide range of domestic and import vehicles in North America. The iridium tip helps maintain a fine firing edge, while the nickel ground electrode and copper core support dependable heat management and long service life in properly matched engines. If you are comparing ignition parts for a Honda Civic or Toyota Corolla, NGK 91909 provides the specification detail buyers need for accurate replacement selection.
This part cross-references NGK 91909 for the same application.
Common Issues This Part Can Address
- Hard starting caused by worn spark plug electrodes
- Rough idle from inconsistent ignition firing
- Misfire symptoms related to degraded plug performance
- Reduced fuel efficiency from weak spark delivery
- Loss of throttle response from aged ignition components
Installation Notes
Verify thread diameter, reach, seat type, and pre-gap before installation. Use the correct torque specification for the engine and inspect ignition coils, boots, and plug wells for wear or contamination during service. For fitment-based searches, confirm the exact application for your Honda Civic or Toyota Corolla before ordering part number 91909.
Quality Assurance
NGK is a long-established OE supplier with extensive North American coverage and manufacturing experience across automotive, motorcycle, marine, and small-engine applications. Part number 91909 reflects NGK’s OE-focused approach to ignition components and specification control.
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| No rows match your filter. | ||||