Dorman 42002 Spark Plug Non-Fouler

Dorman 42002 Spark Plug Non-Fouler

Dorman 42002 is a steel spark plug non-fouler built for 18 mm tapered-seat applications. It helps protect spark plugs from fouling and damage while maintaining a straightforward, serviceable fit on a wide range of classic Ford and Dodge vehicles.

Compatible With Ford Bronco, Ford F-150, Ford F-250, Ford F-350, and other 18 mm tapered-seat applications, this Dorman 42002 part is a practical secondary ignition service component for older trucks, vans, and passenger cars.

• Steel construction for durability in secondary ignition service
• Silver finish
• Designed for 18 mm spark plug thread size
• Tapered spark plug seat style
• Engineered for easy installation on specified vehicles
• Cross-reference: 420023

Detailed Product Overview

This spark plug non-fouler is used in secondary ignition service where spark plug fouling protection is needed on specified vehicles. The tapered-seat, 18 mm design matches a broad range of Ford, Mercury, Lincoln, and Dodge applications, including Fits 1975-1996 Ford E-150 Econoline, N/A; Fits 1975-1996 Ford F-150, N/A; and Fits 1987-1993 Dodge D250, N/A. It also covers classic applications such as Fits 1964-1973 Ford Mustang, N/A and Fits 1968-1972 Lincoln Continental, N/A. Dorman 42002 is a direct-fit service part for owners maintaining older ignition systems and looking for a durable replacement in the correct thread and seat style.

Common Issues It Can Help Address

• Spark plug fouling in older engines
• Damage to spark plugs during service or operation
• Incorrect thread or seat style mismatch during replacement
• Wear-related ignition service concerns on 18 mm tapered-seat applications
• Fitment issues on classic Ford and Dodge secondary ignition setups

Installation Notes and Tips

Verify the spark plug thread size is 18 mm and confirm the tapered seat style before installation. Match the vehicle application exactly, especially on older Ford Bronco, Mustang, and Econoline models, as well as Dodge Ramcharger and D-series trucks. Clean the threads and inspect the spark plug and cylinder head condition before assembly to help ensure proper seating.

Quality Assurance

Dorman manufactures this non-fouler as a durable replacement part for specified applications. The steel construction supports reliable service in secondary ignition use, and the part is engineered for straightforward installation on listed vehicles.