1. Introduction
The Denso IK22 Iridium Spark Plug is an advanced automotive component designed to deliver superior ignition performance. Utilizing iridium, a metal significantly harder and stronger than platinum, this spark plug features a fine 0.4mm iridium center electrode and Denso's patented U-Groove ground electrode. This combination ensures enhanced spark energy and reduced voltage requirements from the ignition system, contributing to improved engine efficiency and durability.
This manual provides essential information regarding the installation, operation, maintenance, and specifications of your Denso IK22 Iridium Spark Plug.
Figure 1.1: Denso IK22 Iridium Spark Plug with its retail packaging.
2. Installation Guide
2.1 General Precautions
- Always ensure the engine is cool before attempting spark plug replacement.
- Disconnect the vehicle's battery to prevent accidental electrical discharge.
- Refer to your vehicle's service manual for specific spark plug replacement procedures and torque specifications.
- Handle spark plugs with care to avoid damaging the electrode or insulator.
2.2 Required Tools
- Spark plug socket (appropriate size for 12mm thread)
- Ratchet and extensions
- Torque wrench
- Spark plug gap gauge (though Denso Iridium plugs are typically pre-gapped, verification is recommended)
- Dielectric grease (optional, for spark plug boots)
2.3 Installation Steps
- Preparation: Locate the spark plugs on your engine. Carefully remove spark plug wires or coil packs. Clean any debris around the spark plug wells to prevent contamination of the combustion chamber.
- Removal: Using the spark plug socket and ratchet, loosen and remove the old spark plugs. Turn counter-clockwise.
- Inspection: Inspect the new Denso IK22 spark plug for any visible damage. While Denso Iridium plugs are typically pre-gapped, it is advisable to verify the gap using a wire-type gap gauge. Avoid adjusting the gap on fine-wire iridium electrodes unless specifically instructed by the manufacturer, as this can damage the tip.
- Installation: Thread the new spark plug into the cylinder head by hand to ensure it starts correctly and avoids cross-threading. Once finger-tight, use a torque wrench to tighten the spark plug to the vehicle manufacturer's specified torque setting. Over-tightening can damage the spark plug or cylinder head threads, while under-tightening can lead to poor heat transfer and misfires.
- Reassembly: Reinstall spark plug wires or coil packs, ensuring they are securely connected. Reconnect the vehicle's battery.
Figure 2.1: Detailed view of the spark plug's threaded portion and ground electrode.
3. Operation and Performance
The Denso IK22 Iridium Spark Plug is engineered for optimal combustion. Its ultra-fine 0.4mm iridium center electrode concentrates the electrical discharge, creating a more powerful and consistent spark. This design allows for a more complete combustion of the air-fuel mixture, which can lead to improved engine response, better fuel efficiency, and reduced emissions.
The superior thermal qualities of iridium enable the spark plug to withstand extreme temperatures, ensuring stable performance even under demanding engine conditions. The patented U-Groove ground electrode further enhances ignitability by allowing the spark to grow larger, improving flame kernel propagation.
4. Maintenance
Denso Iridium spark plugs are designed for long service life. However, regular inspection is recommended as part of your vehicle's routine maintenance schedule. Consult your vehicle's owner's manual for recommended spark plug inspection and replacement intervals.
- Inspection: During inspections, check the electrodes for signs of wear, fouling (carbon, oil, or ash deposits), or damage. A healthy spark plug will typically have a light tan or grayish-white appearance on the insulator tip.
- Cleaning: While cleaning spark plugs is generally not recommended for modern iridium plugs due to the delicate electrode, minor carbon deposits might be carefully removed with a soft brush if necessary. Avoid abrasive cleaning methods.
- Replacement: Replace spark plugs according to your vehicle manufacturer's recommendations or if signs of significant wear or damage are observed. Consistent replacement ensures optimal engine performance and fuel economy.
Figure 4.1: Close-up of the iridium center electrode and U-Groove ground electrode, critical for spark performance.
5. Troubleshooting
While the Denso IK22 spark plug is a high-quality component, issues related to spark plugs can sometimes indicate broader engine problems. If you experience any of the following symptoms, consider inspecting your spark plugs and consulting a qualified mechanic if the issue persists after replacement:
| Symptom | Potential Spark Plug Related Cause |
|---|---|
| Engine Misfires or Rough Idling | Worn, fouled, or incorrectly gapped spark plug. |
| Reduced Fuel Economy | Inefficient combustion due to worn or fouled spark plugs. |
| Hard Starting | Weak or inconsistent spark from worn spark plugs. |
| Lack of Engine Power/Acceleration | Poor combustion efficiency. |
If replacing the spark plugs does not resolve the issue, further diagnostic steps may be required to identify underlying engine or ignition system problems.
6. Technical Specifications
| Feature | Specification |
|---|---|
| Brand | Denso |
| Model Number | IK22 |
| Core Material | Iridium |
| Thread Size | 12mm x 19mm |
| Top Material Type | Metal |
| Vehicle Service Type | Various |
| UPC | 042511531048 |
| Manufacturer Part Number | IK22 |
Figure 6.1: The Denso IK22 model designation clearly visible on the spark plug's ceramic insulator.
7. Vehicle Compatibility
The Denso IK22 spark plug is compatible with a wide range of vehicles. To ensure proper fitment for your specific vehicle, it is crucial to cross-reference the spark plug with your vehicle's manufacturer specifications or the OEM part number. A comprehensive list of compatible OEM part numbers includes, but is not limited to: ABARTH%7571564, ALFA ROMEO%7571564, AUDI%101000031AB, BMW%12120031708, CHRYSLER%7571564, DACIA%7700500216, DAIHATSU%NDIK22, FIAT%7571564, FORD%5099725, HONDA%980795785C, INNOCENTI%7571564, IVECO%504082651, JEEP%7571564, LANCIA%7571564, MITSUBISHI%MD314766, NISSAN%22401WD517, PORSCHE%99917022390, RENAULT%7700500216, ROLLS%UEM78911, SEAT%101000031AB, SKODA%101000031AB, SUBARU%SAB330DE3450, SUZUKI%271175, VOLKSWAGEN%101000031AB, VOLVO%271758. Always verify compatibility with a trusted automotive parts database or your vehicle's service manual.
8. Warranty Information
For detailed warranty information regarding the Denso IK22 Iridium Spark Plug, please refer to the official Denso website or contact Denso customer support directly. Warranty terms and conditions may vary based on region and point of purchase.
9. Customer Support
If you have further questions or require technical assistance regarding the Denso IK22 Iridium Spark Plug, please visit the official Denso global website or contact an authorized Denso dealer or service center. They can provide expert advice and support for your specific application.
