Autolite HT1 Spark Plug

Autolite HT1 Platinum Spark Plug Overview

The Autolite HT1 Platinum Spark Plug is an OE-style ignition component built for Ford 3V engines that require a high-thread design and a preset gap. It uses a platinum fine-wire center electrode, a tapered ground electrode tip, and a ceramic insulator to support consistent ignition performance in demanding truck and performance applications.

Autolite’s Platinum Spark Plug line focuses on OE form, fit, and function for a wide range of domestic and import vehicles. The HT1 is engineered for specific Ford, Lincoln, and Mercury applications, including Ford F-150, Ford Mustang, and Lincoln Navigator fitments listed below.

Key Features

• Platinum center electrode tip with fine-wire design for focused ignition
• High-thread, tapered-seat spark plug construction
• Preset 0.035 in. / 0.90 mm gap; do not regap before installation
• 5000 ohm resistor design for ignition system noise control
• Copper center electrode core with nickel ground electrode materials
• Ceramic insulator with extra-long special insulator type
• 14 mm thread diameter, 9/16 in. hex, 0.750 in. reach

Detailed Description

The Autolite HT1 is a platinum spark plug designed around OE requirements for Ford 3V engines. Its high-thread configuration and comprehensive sealing design help support durability and heat transfer, while the platinum tip and fine-wire center electrode promote concentrated spark delivery. This part number is used in select Ford, Lincoln, and Mercury trucks and performance models, including Ford F-150, Ford Explorer, Ford Mustang, and Lincoln Navigator applications.

This part cross-references Champion Spark Plug 7989 for the same application.

What It Helps Address

• Rough idle caused by worn or inconsistent spark plugs
• Hard starting related to weak ignition output
• Misfire conditions from degraded plug electrodes
• Loss of throttle response from inefficient combustion
• Maintenance needs on high-thread Ford 3V engine applications

Installation Notes and Tips

• Fits 2008 Ford Explorer, N/A; Black Ignition Coil Boot; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug
• Fits 2008 Ford Explorer Sport Trac, N/A; Black Ignition Coil Boot; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug
• Fits 2006-2008 Ford F-150, N/A; High Thread Spark Plug
• Fits 2005-2008 Ford F-250 Super Duty, N/A; High Thread Spark Plug
• Fits 2005-2008 Ford F-350 Super Duty, N/A; High Thread Spark Plug
• Fits 2008 Ford Mustang, N/A; Black Ignition Coil Boot; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug
• Fits 2006-2008 Lincoln Mark LT, N/A; High Thread Spark Plug
• Fits 2005-2008 Lincoln Navigator, N/A; High Thread Spark Plug
• Fits 2008 Mercury Mountaineer, N/A; Black Ignition Coil Boot; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug
• Fits 2005-2007 Ford Expedition, N/A; High Thread Spark Plug
• Fits 2006-2007 Ford Explorer, N/A; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug
• Fits 2007 Ford Explorer Sport Trac, N/A; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug
• Fits 2005-2007 Ford Mustang, N/A; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug
• Fits 2006-2007 Mercury Mountaineer, N/A; Do Not Gap, Gap is Preset; OE Style; Platinum Spark Plug

Verify engine application and note the preset gap before installation. The HT1 is intended for specific Ford 3V engine fitments, so matching the vehicle notes is important for correct service.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and this spark plug is built to OE-style form, fit, and function standards for the listed applications. The Autolite HT1 is part of the Platinum Spark Plug line and is engineered for consistent service in the specified Ford, Lincoln, and Mercury vehicles.