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Denso 3112 Spark Plug
| Brand | Denso 3112 |
|---|---|
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Standard |
| Hex Size | 16.0 |
| Manufacturer Heat Range | 20 |
| Pre-Gap Size | 1.1 |
| Reach | 19.00 |
| Resistance | 5000 |
| Seat Type | Flat |
| Thread Diameter | 14.00 |
| Product line | U-Groove Conventional |
| Fits | Mazda · 9 vehicles |
OEM-quality standards. Manufactured to meet original-equipment expectations.
U-groove design. Promotes a more efficient spark for reliable ignition.
Copper core. Helps transfer heat effectively for stable performance.
Cross-references DENSO Auto Parts QJ20CR11, Mazda 0000-18-F201 and Mazda F201-18-110 for the same application. See all 4.
Denso 3112 Spark Plug for Mazda Applications
The Denso 3112 is a conventional U-Groove spark plug built to OEM quality standards for dependable ignition performance. It uses a copper center electrode core with a nickel tip, a nickel ground electrode tip, and a standard single-ground configuration for consistent spark delivery in the ignition system.
Key Features
- U-Groove Conventional spark plug design
- 5000 ohm resistor for ignition noise suppression
- Copper center electrode core for efficient heat transfer
- Nickel center and ground electrode tip materials
- Pre-gapped to 1.1 mm
- Flat seat, 14.00 mm thread diameter, 19.00 mm reach
- 16.0 mm hex size for standard service access
Product Details
Denso 3112 is engineered as a conventional ignition service part for Mazda vehicles that call for this specification. The U-Groove design supports stable spark exposure, while the 5000 ohm resistance helps control electrical interference in the secondary ignition system. This part cross-references DENSO Auto Parts QJ20CR11 for the same application. It is listed for 1988-1989 Mazda 626, 1988-1989 Mazda 929, 1988-1989 Mazda MX-6, 1989 Mazda B2600, and 1989-1990 Mazda MPV, making it a direct-fit option for several Mazda ignition service needs. The Denso 3112 part number is also useful when matching OE-style replacement specifications for these Mazda models.
What It Helps Address
- Hard starting caused by worn spark plug electrodes
- Rough idle from inconsistent spark delivery
- Misfire conditions related to aged ignition components
- Reduced combustion efficiency from excessive plug wear
- Ignition noise concerns in the secondary ignition circuit
Installation Notes and Tips
Verify thread diameter, reach, seat type, and heat range against the original plug specification before installation. The pre-gap is set at 1.1 mm, but final confirmation against the vehicle service information is recommended during routine ignition service. Use the correct 16.0 mm spark plug socket and install to the manufacturer’s specified torque for the cylinder head material.
Quality Assurance
Denso manufactures this spark plug to OEM quality standards, with materials and dimensions selected for consistent service in the listed Mazda applications. For buyers searching Mazda 626 spark plug, Mazda MX-6 spark plug, or Denso 3112, this part provides a specification-matched replacement option.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1990 | Mazda | MPV | N/A | U-Groove Conventional |
| 1989 | Mazda | 626 | N/A | U-Groove Conventional |
| 1989 | Mazda | 929 | N/A | U-Groove Conventional |
| 1989 | Mazda | B2600 | N/A | U-Groove Conventional |
| 1989 | Mazda | MPV | N/A | U-Groove Conventional |
| 1989 | Mazda | MX-6 | N/A | U-Groove Conventional |
| 1988 | Mazda | 626 | N/A | U-Groove Conventional |
| 1988 | Mazda | 929 | N/A | U-Groove Conventional |
| 1988 | Mazda | MX-6 | N/A | U-Groove Conventional |
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