NGK ILZKR8A 94290 Laser Iridium Spark Plug

Genuine NGK Component (94290) With the smallest tip diameter available, OE Iridium spark plugs pro...

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Product Information

Full details

The NGK ILZKR8A 94290 Laser Iridium Spark Plug is designed for automotive enthusiasts and DIY mechanics seeking to maintain or improve engine ignition performance with an OEM-spec component. Featuring the smallest tip diameter in the industry, this spark plug offers superior ignitability, improved fuel economy, and lower emissions, though users must be diligent in verifying compatibility against their original factory components before installation.

All features

Model Part Number	94290
Brand	NGK

Extended Product Information

FAQs

Should I adjust the gap on my NGK Iridium plugs?

NGK Iridium plugs are pre-gapped at the factory. Avoid adjusting the gap, as the delicate iridium center electrode can be easily damaged.

Do I need to apply anti-seize to the threads?

No. These plugs feature trivalent metal plating which provides anti-seize properties; adding extra lubricant can lead to over-tightening.

How long do these spark plugs typically last?

Due to the iridium and platinum construction, these plugs are designed for extended service intervals, often exceeding 60,000 to 100,000 miles depending on vehicle usage.

What is the benefit of the small tip diameter?

The small tip diameter requires less voltage to create a spark, which leads to better ignitability and more efficient fuel combustion.

How do I know if this plug fits my car?

Always check your owner's manual or use a trusted parts cross-reference tool to match the MPN 94290 to your specific engine code and model year.

Troubleshooting

Engine misfire after installation

Ensure the ignition coil is fully seated and the electrical connector is snapped into place properly.

Difficulty threading the plug

Stop immediately, remove the plug, and check the threads in the cylinder head for debris or damage; never force the plug.

Rough idle

Verify that all spark plugs are correctly gapped to factory specifications and that all ignition leads or coils are functioning.

Pros and Cons

Pros

Significantly longer service life due to iridium and platinum materials
Provides stable engine idle and superior anti-fouling characteristics
Improved fuel economy and reduced exhaust emissions
Corrosion-resistant plating prevents seizing in the cylinder head

Cons

Requires precise vehicle compatibility verification before purchase
Can be more expensive than standard nickel or copper plugs
Small electrode tip is delicate and should not be gapped using traditional tools

Setup, Compatibility & Care

Before installation, you must confirm that the 94290 part number matches your vehicle’s specific service manual requirements. Installation should be performed on a cold engine to prevent cross-threading the cylinder head. Always use a spark plug socket with a rubber insert to protect the ceramic insulator. NGK’s trivalent metal plating means you should generally not apply anti-seize lubricant to the threads, as the factory coating is designed to provide the necessary lubrication and corrosion protection. Ensure you use a torque wrench to tighten the plug to the manufacturer-specified value to prevent damage to the engine block.