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Denso 5378 Spark Plug
| Brand | Denso 5378 |
|---|---|
| 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 | 0.8 |
| Ground Electrode Quantity | 1 |
| Hex Size | 20.6 |
| Manufacturer Heat Range | 20 |
| Seat Type | Flat |
| Reach | 12.70 |
| Thread Diameter | 14.00 |
| Fits | — |
Iridium Power line. Features Denso's smallest iridium center electrode for sharper ignition performance.
Tapercut, U-Groove design. Promotes a stronger spark and efficient combustion.
Copper core. Helps conduct heat efficiently for stable spark plug operation.
Cross-references DENSO Auto Parts IWF20 for the same application. See all 1.
Denso Iridium Power Spark Plug 5378
Denso Iridium Power spark plug 5378 is built for drivers who want precise ignition performance from a compact iridium design. It uses a 0.4 mm iridium center electrode to promote consistent spark delivery, along with a tapered cut and U-groove ground electrode profile for efficient flame initiation.
Compatible With Honda Civic and other applications that call for this specification, Denso 5378 is a direct-fit spark plug in the Ignition > Secondary Ignition category. The Iridium Power line focuses on fine-wire electrode construction and stable electrical resistance for dependable ignition response.
Key Features
- Iridium center electrode tip material with a 0.4 mm fine-wire design
- Tapered cut and U-groove ground electrode tip design
- 5000 ohm resistance
- Copper center electrode core and nickel ground electrode core
- 14.00 mm thread diameter, 12.70 mm reach, flat seat
- 20.6 mm hex size and 0.8 pre-gap size
- Manufacturer heat range 20
- Cross-reference: DENSO Auto Parts IWF20
Iridium Power Design
The Denso Iridium Power product line is engineered around a small-diameter iridium center electrode to improve spark concentration and ignition consistency. On applications such as Honda Civic and related engine platforms, that focused spark design supports cleaner combustion events and stable throttle response when the ignition system is in proper condition. Part number 5378 is a practical OE-style replacement for drivers servicing worn plugs or restoring ignition performance.
What This Spark Plug 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 aged secondary ignition components
- Maintenance replacement for Honda Civic spark plug service and similar applications
Installation Notes
Verify thread diameter, reach, seat type, and heat range before installation. Denso 5378 uses a flat seat and 14.00 mm thread diameter, so the cylinder head specification must match exactly. Check the pre-gap against the engine requirement before installing, and follow the vehicle service manual for torque and plug-wire or coil-on-plug handling procedures.
Quality Assurance
Denso manufactures this spark plug with iridium center electrode construction and OE-style dimensional specifications for consistent fit and ignition performance. Part number 5378 is also identified by DENSO Auto Parts cross-reference IWF20.
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|---|---|---|---|---|
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