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Denso 4136 Spark Plug
Denso 4136 Spark Plug for Maserati
The Denso 4136 is a conventional spark plug built for reliable secondary ignition performance in select Maserati applications. Its U-groove ground electrode design helps improve ignitability for more efficient combustion, while the copper core and nickel electrode materials support consistent spark delivery.
Key Features
- U-groove ground electrode design for improved ignitability
- Conventional spark plug construction for select OEM-style applications
- 5000 ohm resistance for controlled ignition performance
- Copper center electrode core for stable heat transfer
- Nickel center and ground electrode tip materials
- Pre-gapped to 0.8 mm
- Flat seat design, 14.00 mm thread diameter, 19.00 mm reach
- 20.6 mm hex size and manufacturer heat range 24
Product Details
Denso U-Groove Conventional spark plugs are engineered around a ground electrode shape that exposes more of the spark kernel, helping the plug fire cleanly under demanding combustion conditions. For Maserati 425, Maserati Spyder, and Maserati Biturbo applications, the Denso 4136 offers a direct-fit ignition service part with the dimensions and electrode materials needed for proper secondary ignition performance. This part cross-references DENSO Auto Parts (e.g., W24EPR-U) for the same application.
What It Helps Address
- Hard starting caused by worn or fouled spark plugs
- Rough idle from inconsistent spark delivery
- Misfire conditions related to degraded ignition performance
- Reduced combustion efficiency from excessive plug wear
- Maintenance replacement for aging Maserati ignition service intervals
Installation Notes
Verify thread diameter, reach, seat type, and heat range before installation. The Denso 4136 is specified with a 14.00 mm thread diameter, 19.00 mm reach, flat seat, and 0.8 mm pre-gap. Confirm the vehicle application against the listed fitment for 1984 Maserati Biturbo, 1986-1987 Maserati 425, and 1986-1987 Maserati Spyder. Use proper spark plug service procedures and torque specifications for the engine.
Quality Assurance
Denso’s U-Groove Conventional line focuses on dependable ignition performance through electrode geometry and material selection. The 4136 is built to the listed specifications for consistent fitment and service in the confirmed Maserati applications.
| Brand | Denso |
|---|---|
| Part Number | 4136 |
| Position | U-Groove Conventional |
| Resistance | 5000 |
| Ground Electrode Tip Design | U-groove |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | 0.8 |
| Ground Electrode Quantity | 1 |
| Hex Size | 20.6 |
| Manufacturer Heat Range | 24 |
| Seat Type | Flat |
| Reach | 19.00 |
| Thread Diameter | 14.00 |
This part fits 5 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1987 | Maserati | 425 | N/A | U-Groove Conventional |
| 1987 | Maserati | Spyder | N/A | U-Groove Conventional |
| 1986 | Maserati | 425 | N/A | U-Groove Conventional |
| 1986 | Maserati | Spyder | N/A | U-Groove Conventional |
| 1984 | Maserati | Biturbo | N/A | U-Groove Conventional |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.