Autolite APP646 Spark Plug

Autolite Double Platinum Spark Plug APP646

Autolite Double Platinum Spark Plug APP646 is built for OE-style ignition performance with platinum-to-platinum firing for longer service life and consistent spark delivery. It is a direct-fit spark plug choice for a wide range of Chrysler, Dodge, Plymouth, Pontiac, Buick, Oldsmobile, Cadillac, and related applications where the specified gap and thread dimensions match the vehicle requirements.

Key Features

• Double platinum firing surfaces for durable spark performance
• Platinum center electrode tip and platinum ground electrode tip
• Pre-gapped at 0.050 in. / 1.30 mm
• 14.0 mm thread diameter with 0.750 in. reach
• Flat seat design with mid-projection ceramic insulator
• Resistor spark plug with stud terminal type
• Tapered ground electrode tip design for stable ignition characteristics

Product Line Details

The Autolite Double Platinum Spark Plug line is positioned as an OE-style replacement option for drivers who want factory-matched form, fit, and function without moving away from a value-focused aftermarket part. APP646 follows that approach with platinum materials on both firing points to support consistent ignition performance in the specified applications.

Detailed Description

Autolite APP646 is a double platinum spark plug engineered for vehicles that call for a 0.050-inch gap and a 14 mm, flat-seat plug with a 13/16-inch hex. The platinum center electrode and platinum ground electrode help maintain firing consistency over time, while the resistor design supports clean ignition operation. This part cross-references Champion Spark Plug 31 for the same application. Common fitment includes 2000 Chrysler Grand Voyager, 1997-2000 Chrysler Town & Country, 1996-2000 Dodge Caravan, 1996-2000 Dodge Grand Caravan, and 1997-2000 Plymouth Voyager. It also covers older applications such as 1975-1984 Cadillac models and 1987-1993 Pontiac, Buick, and Oldsmobile vehicles listed in the fitment data. APP646 is a practical OE-style replacement for drivers servicing Chrysler Town & Country, Dodge Caravan, or Plymouth Voyager ignition systems.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Slow throttle response during acceleration
• Reduced fuel economy linked to degraded spark performance
• Maintenance intervals that call for a platinum spark plug upgrade

Installation Notes and Tips

Verify the vehicle’s required gap, thread diameter, reach, seat type, and terminal style before installation. APP646 is pre-gapped at 0.050 in. / 1.30 mm, but final verification against the engine specification is recommended before use. Confirm the application against the fitment list for Chrysler, Dodge, Plymouth, Pontiac, Buick, Oldsmobile, and Cadillac models, including 2000 Chrysler Grand Voyager and 1996-2000 Dodge Caravan listings.

Quality Assurance

Autolite supplies ignition products for automotive aftermarket and original equipment applications, and APP646 is built to OE form, fit, and function standards for the listed vehicles. The double platinum construction is selected to support durable spark plug performance in the specified applications.