NGK 97637 Spark Plug

NGK Iridium IX Spark Plug 97637 Overview

NGK 97637 is an Iridium IX spark plug built for precise ignition performance in select Fiat 500 and Chevrolet Spark applications. It combines an iridium center electrode with a nickel ground electrode and a copper core to support consistent spark delivery and stable combustion.

As part of the NGK Iridium IX Spark Plug line, this plug is engineered for drivers who need OE-style fitment with a fine-wire iridium tip and a solid terminal nut design. The 97637 spark plug is listed for 2012-2017 Fiat 500 and 2013-2015 Chevrolet Spark applications.

Key Features

• NGK Iridium IX Spark Plug, part number 97637
• Iridium center electrode tip material for focused spark delivery
• Copper center electrode core material
• Nickel ground electrode core material with standard ground configuration
• Taper cut ground electrode tip design
• Resistor type spark plug with 5000 ohm resistance
• Flat seat design, 12 mm thread diameter, 19 mm reach
• Pre-gapped at 0.031 in
• 5/8 in hex size and non-removable nut terminal

Detailed Description

NGK 97637 is a direct-fit spark plug option for drivers searching for an NGK Iridium IX spark plug for Fiat 500 or Chevrolet Spark service. The iridium tip supports a fine, durable firing point, while the copper core and resistor design help maintain stable ignition characteristics in everyday driving. The 7 heat range, flat seat, and 19 mm reach align with the listed OE-style application requirements.

This part cross-references NGK 97637 for the same application.

Vehicle Fitment

• Fits 2014-2017 Fiat 500, N/A; Preferred Solid Terminal Nut Spark Plug; Gap 0.032"; Iridium IX Spark Plug
• Fits 2013-2015 Chevrolet Spark, N/A; Preferred Solid Terminal Nut Spark Plug; Gap 0.036"; Iridium IX Spark Plug
• Fits 2012-2013 Fiat 500, N/A; Solid terminal nut spark plugs with a 0.040" gap are recommended.; Iridium IX Spark Plug

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting related to weak ignition output
• Misfire conditions from degraded plug performance
• Reduced throttle response from inconsistent spark delivery
• Maintenance replacement for specified Fiat 500 and Chevrolet Spark ignition service

Installation Notes and Tips

Verify the listed application before installation and confirm the required gap specification for the exact vehicle year. The plug is supplied with a 0.031 in pre-gap, but the fitment notes call for 0.032 in on 2014-2017 Fiat 500, 0.036 in on 2013-2015 Chevrolet Spark, and 0.040 in on 2012-2013 Fiat 500. Use the correct torque procedure for the flat seat design and inspect the ignition system for wear before installing new plugs.

Quality Assurance

NGK is a long-established OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its manufacturing and distribution network supports OE-level standards for durability and operational performance across automotive applications.