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NGK 4390 Spark Plug Wire Set
| Brand | NGK 4390 |
|---|---|
| Core Material | Mag (Var. Pitch) |
| Insulation Color | Blue |
| Insulation Material | Silicone |
| Insulation Outside Diameter | 7.00 |
| Noise Suppression Type | Yes |
| Part Number | RC-FX55 |
| Stock Number | 4390 |
| Universal Or Specific Fit | Specific |
| Product line | NGK Spark Plug Wire Set |
| Fits | Subaru · 2 vehicles |
OE-standard replacement. Built to meet original-equipment durability and performance requirements.
Silicone insulation. Helps resist heat and wear for dependable ignition performance.
Noise suppression. Helps reduce electrical interference in the ignition system.
Cross-references Anchor 9369, Carlson 7522 and DENSO Auto Parts 671-4234 for the same application. See all 14.
NGK Spark Plug Wire Set for Subaru Impreza
NGK Spark Plug Wire Set 4390 is a specific-fit ignition wire set built for 1993-1994 Subaru Impreza applications. It uses blue silicone insulation, a noise-suppression design, and a Mag (Var. Pitch) core to support stable spark delivery in the ignition system.
Key Features
- Specific-fit spark plug wire set for 1993-1994 Subaru Impreza
- Blue silicone insulation for heat resistance and durability
- Noise suppression design to help reduce ignition interference
- Mag (Var. Pitch) core material for consistent electrical performance
- 7.00 mm insulation outside diameter
- NGK part number 4390 / RC-FX55
Product Details
NGK Spark Plug Wire Set 4390 is part of the NGK Spark Plug Wire Set line, which focuses on ignition components engineered to meet OE-level expectations for fit and performance. NGK draws on long-term automotive experience and global OE expertise to produce replacement ignition parts for domestic and import vehicles. For Subaru Impreza owners looking for a direct replacement ignition wire set, this part is built around the listed vehicle application and the specified wire construction.
This part cross-references FEL-PRO 4390 for the same application.
Common Issues This Part May Address
- Misfire caused by worn or damaged spark plug wires
- Hard starting related to weak ignition transfer
- Rough idle from inconsistent spark delivery
- Radio or electrical noise linked to degraded suppression performance
- Loss of ignition efficiency from cracked insulation or aging wire cores
Installation Notes and Tips
Verify the wire routing and cylinder locations before removal so the replacement set is installed in the correct order. Inspect the distributor cap, ignition coil connections, and spark plugs at the same time to confirm the rest of the ignition system is in good condition. For best results, match the wire ends securely and keep the wires separated from hot exhaust components and sharp edges.
Quality Assurance
NGK manufactures premium ignition products with a focus on durability and operational performance to meet OE standards. The brand’s ignition lineup includes spark plugs, glow plugs, ignition coils, coil-on-plug boots, and wire sets, supported by global manufacturing and distribution capabilities.
Compatible With 1993-1994 Subaru Impreza, N/A.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1994 | Subaru | Impreza | 1.8L | H4 | N/A | NGK Spark Plug Wire Set |
| 1993 | Subaru | Impreza | 1.8L | H4 | N/A | NGK Spark Plug Wire Set |
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