NGK 90543 Spark Plug

NGK Laser Iridium Spark Plug 90543

NGK Laser Iridium Spark Plug 90543 is an OE-style ignition component built for precise spark delivery and stable performance in select Cadillac applications. It uses an iridium center electrode tip, a nickel ground electrode, and a tapered seat design to match the original equipment style specified for these vehicles.

The NGK Laser Iridium line focuses on OE-level fit and durability for modern ignition systems. For Cadillac CTS and Cadillac XTS applications, this spark plug supports the factory-style service interval and the correct gap specification listed for the vehicle fitment.

Key Features

• Laser Iridium spark plug with iridium center electrode tip material
• Nickel ground electrode with standard ground configuration
• Pre-gapped at .032 for the listed part specification
• 5000 ohm resistance for ignition system compatibility
• Tapered seat design with 14 mm thread diameter and 5/8 hex size
• OE equivalent design for select Cadillac CTS and Cadillac XTS models
• NGK part number 90543, manufacturer part number ILTR7E9

Detailed Description

NGK 90543 is a Laser Iridium spark plug engineered for select 2014 Cadillac CTS and 2014-2015 Cadillac XTS models. The iridium center electrode helps maintain consistent spark characteristics, while the copper core and nickel ground electrode support reliable heat transfer and ignition performance. This plug uses a tapered seat and standard single-ground configuration to match the OE-style application requirements.

NGK is a long-established OE supplier with broad coverage across automotive applications, and this spark plug reflects that focus on original equipment standards. If you are replacing worn plugs in a Cadillac CTS or Cadillac XTS, part number 90543 provides a direct-fit option for the listed vehicles and service interval requirements.

This part cross-references ACDelco 41-147 and GM 12642791 for the same application.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from degraded ignition performance
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from inconsistent spark delivery
• Service replacement needs at the OE-recommended interval

Installation Notes and Tips

• Fits 2014 Cadillac CTS, N/A.
• Fits 2014-2015 Cadillac XTS, N/A.
• Verify the specified gap before installation; listed fitment notes call for a 0.036" gap.
• Confirm the tapered seat and 14 mm thread size match the cylinder head before installation.
• Use the vehicle service information for torque and replacement procedure.

Quality Assurance

NGK manufactures spark plugs to OE standards and supplies ignition components for domestic and import vehicles across North America. Part number 90543 is built to support the fitment and service expectations listed for the Cadillac CTS and Cadillac XTS applications.