NGK (4393) RC-IE42 Spark Plug Wire Set

Product Overview

The NGK (4393) RC-IE42 Spark Plug Wire Set is engineered for optimal ignition performance in compatible vehicles. These wire sets feature a 7mm ultra-low resistance magnetic core, wire wound ignition cables, and boots designed to meet or exceed OEM specifications. The high-temperature silicone jacket provides resistance against extreme under-hood temperatures, moisture, oil, and petrol, preventing cracking. Reinforced with high-density, premium fiberglass braiding over EPDM/silicone inner insulation, these wires offer superior dielectric strength and excellent tensile strength. NGK wire sets incorporate variable pitch wire winding technology to effectively suppress radio frequency interference, ensuring consistent performance, superior firing, and fuel efficiency.

Key Features:

• Set includes 4 wires (with Coil Lead).
• Variable pitch winding for ultra-low resistance, powerful spark, and effective EMI/RFI noise suppression.
• Wires are numbered for easy cylinder identification, and coil wires are color-coded for straightforward installation.
• Positive-locking, corrosion-resistant stainless steel terminal ends ensure a tight fit and maximum resistance to vibration and separation.
• High-temperature (250°C / 482°F) silicone outer jacket resists moisture, oil/petrol, and cracking from temperature extremes.

Figure 1: The NGK (4393) RC-IE42 Spark Plug Wire Set, showing the blue wires and black boots.

What's in the Box

Your NGK (4393) RC-IE42 Spark Plug Wire Set package contains the following components:

• 4 Spark Plug Wires (including the Coil Lead)

Figure 2: Packaging for the NGK Spark Plug Wire Set, indicating "Wire Set" and "Exact OEM Fit & Design".

Installation Instructions

Proper installation of spark plug wires is crucial for vehicle performance and safety. If you are unsure about any step, it is recommended to consult a qualified automotive technician.

Safety Precautions:

• Ensure the engine is completely off and cool before beginning work.
• Disconnect the negative terminal of the vehicle's battery to prevent accidental electrical discharge.
• Wear appropriate personal protective equipment, including safety glasses and gloves.
• Avoid touching hot engine components.

Step-by-Step Installation:

1. Identify Cylinder Order: Note the firing order of your engine and the corresponding cylinder numbers. NGK wires are numbered for easy identification.
2. Remove Old Wires (One at a Time): To avoid mixing up the firing order, replace one spark plug wire at a time. Gently twist and pull the boot from the spark plug, then from the distributor cap or coil pack. Do not pull on the wire itself.
3. Inspect Spark Plugs: While the old wire is off, inspect the spark plug for wear or damage. Replace if necessary.
4. Install New Wires: Take a new NGK wire of the correct length and connect it to the spark plug. Push firmly until you feel a click, ensuring the boot is fully seated.
5. Connect to Distributor/Coil: Route the new wire along the same path as the old one and connect the other end to the correct terminal on the distributor cap or coil pack. Ensure a secure connection.
6. Repeat for All Wires: Continue this process for each spark plug wire until all old wires have been replaced with the new NGK set.
7. Reconnect Battery: Once all wires are securely installed, reconnect the negative terminal of the vehicle's battery.
8. Test Operation: Start the engine and listen for any misfires or unusual noises. Ensure smooth operation.

For specific vehicle wiring diagrams, refer to your vehicle's service manual.

Maintenance and Care

Proper maintenance of your NGK spark plug wires will ensure their longevity and optimal performance.

• Regular Inspection: Periodically inspect the wires for any signs of wear, cracking, fraying, or damage to the insulation or boots. Look for burn marks or discoloration, which may indicate arcing.
• Cleaning: Keep the wires clean and free from oil, grease, and dirt. Use a clean cloth to wipe them down. Avoid using harsh chemicals that could damage the silicone jacket.
• Secure Routing: Ensure wires are properly routed and secured away from hot engine components, moving parts, and sharp edges to prevent damage.
• Avoid Pulling on Wires: When removing wires, always grasp the boot, not the wire itself, to prevent internal damage to the conductor.
• Check Connections: Occasionally check that all connections to the spark plugs and coil/distributor are secure and free from corrosion.

While NGK wires are designed for durability, regular checks can help identify potential issues before they lead to performance problems.

Troubleshooting

If you experience issues after installing your new spark plug wires, consider the following common troubleshooting steps:

• Engine Misfire or Rough Idle:
  • Verify that each wire is connected to the correct spark plug and the correct terminal on the distributor/coil pack according to the engine's firing order.
  • Ensure all boots are fully seated on both the spark plug and the coil/distributor terminals. A loose connection can cause misfires.
  • Check for any visible damage to the new wires, such as cuts or pinches, that might have occurred during installation.
• Radio Frequency Interference (RFI):
  • While NGK wires are designed to suppress RFI, ensure no other electrical components or wires are interfering with the spark plug wires' path.
  • Verify proper grounding of all engine components.
• Difficulty Starting:
  • Double-check all connections.
  • Ensure the battery is fully charged and properly connected.
• Check Engine Light:
  • If the check engine light illuminates, retrieve the diagnostic trouble codes (DTCs) using an OBD-II scanner. This can help pinpoint the exact issue.
  • Common codes related to ignition issues include P0300 (random misfire) or P030X (cylinder X misfire).

If problems persist after troubleshooting, it is advisable to seek assistance from a certified mechanic.

Specifications

Warranty and Support

NGK stands behind the quality and performance of its products. The NGK (4393) RC-IE42 Spark Plug Wire Set is backed by a Limited Lifetime Warranty, as indicated on the product packaging.

For detailed warranty terms, claims, or technical support, please refer to the official NGK website or contact NGK customer service directly. Ensure you have your product model number (RC-IE42) and proof of purchase available when contacting support.

NGK is recognized as "The Ignition Specialist" with over 80 years of automotive experience, committed to innovation, performance, and quality in all its products.