/live/media/NP/NP_5377_FRO.JPG)
Denso 5377 Spark Plug
| Brand | Denso 5377 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Tapercut, u-groove |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | 0.9 |
| Ground Electrode Quantity | 1 |
| Hex Size | 18.0 |
| Manufacturer Heat Range | 27 |
| Seat Type | Flat |
| Reach | 19.00 |
| Thread Diameter | 12.00 |
| Fits | — |
Iridium Power. Performance-focused spark plug line with a 0.4 mm iridium center electrode.
Tapercut, U-Groove. Ground electrode design promotes efficient spark exposure.
Copper core. Copper center core helps conduct heat and electricity effectively.
Cross-references DENSO Auto Parts IX27B for the same application. See all 1.
Denso Iridium Power Spark Plug 5377
Denso Iridium Power spark plug 5377 is built for drivers who want precise ignition performance and stable combustion response. It uses a 0.4 mm iridium center electrode, a copper core, and a nickel ground electrode to support consistent spark delivery in demanding engine conditions.
Compatible With select Honda Civic and Toyota Corolla applications where Denso IX27B cross-reference fitment is specified, this spark plug is part of the Denso Iridium Power line, which focuses on fine-wire iridium construction and efficient ignition characteristics for modern gasoline engines.
Key Features
- Part number 5377 from Denso Iridium Power
- 0.4 mm iridium center electrode for fine-wire spark delivery
- Copper core center electrode for heat transfer support
- Nickel ground electrode with Tapercut and U-Groove tip design
- 0.9 pre-gap size
- 5000 resistance specification
- Flat seat, 12.00 mm thread diameter, 19.00 mm reach, and 18.0 hex size
- Manufacturer heat range 27
Detailed Description
Denso 5377 is an iridium spark plug engineered around a small-diameter center electrode to concentrate ignition energy and promote reliable firing. The Tapercut and U-Groove ground electrode design supports a focused spark path, while the copper core and nickel ground electrode materials help manage heat and durability in secondary ignition service. For shoppers comparing Denso spark plug 5377 against OE-style replacements, this part cross-references Denso Auto Parts IX27B for the same application.
Use this plug when servicing engines that call for a 12 mm thread, 19.00 mm reach, flat seat, and 0.9 pre-gap specification. It is a practical choice for Honda Civic and Toyota Corolla maintenance where the correct heat range, resistance, and electrode design matter for stable ignition performance.
What It Helps Address
- Hard starting caused by worn or eroded spark plug electrodes
- Misfire conditions related to weak or inconsistent spark output
- Rough idle from degraded ignition performance
- Reduced throttle response from aging secondary ignition components
- Service replacement needs for specified Honda Civic and Toyota Corolla applications
Installation Notes and Tips
Verify thread diameter, reach, seat type, heat range, and pre-gap against the engine specification before installation. Use the correct torque procedure for the cylinder head material and inspect ignition coils, boots, and wires during service. Confirm the vehicle application by engine code and service data for Honda Civic or Toyota Corolla fitment before final installation.
Quality Assurance
Denso manufactures the Iridium Power line with fine-wire iridium electrode construction and application-specific ignition specifications. Part number 5377 is built to meet the listed technical dimensions and resistance requirements for secondary ignition service.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| No rows match your filter. | ||||