SKP SP1004 Spark Plug

Iridium Spark Plug for Ford and Mercury Applications

SKP SP1004 is a spark plug built for secondary ignition service across a wide range of Ford, Mercury, Mazda, Jaguar, Cadillac, Audi, Lincoln, Dodge, Pontiac, Mercedes-Benz, and Volvo applications. It uses an iridium center electrode tip with a copper core to support consistent ignition performance and stable spark delivery.

Compatible With Ford E-350 Super Duty, Ford E-150, Ford E-250, Ford Mustang, Ford Ranger, and other listed vehicles, this spark plug is a direct-fit option for many OE-style replacement needs. The SP1004 part number is also a useful reference when cross-shopping ignition tune-up parts.

Key Features

• Iridium center electrode tip for durable spark delivery
• Copper core center electrode for efficient conductivity
• Secondary ignition spark plug for gasoline engine applications
• Direct replacement fitment across many Ford, Mercury, Mazda, and Jaguar models
• Cross-reference: Autolite XP103
• Part number: SKP SP1004

Detailed Description

SKP SP1004 is engineered as a replacement spark plug for a broad range of vehicles that call for specific gap settings and OE-style ignition performance. Fitment includes applications such as 1997-2004 Ford Expedition, 2007-2012 Ford Escape, 2005-2008 Mazda 6, 2003-2008 Jaguar X-Type, and 2010-2014 Ford E-150 and E-250 models, along with many additional listings. The iridium tip helps maintain a consistent firing point, while the copper core supports reliable electrical transfer in the ignition system.

This part cross-references Autolite XP103 for the same application. When replacing plugs on Ford E-350 Super Duty, Ford Mustang, or Mercury Grand Marquis models, verify the required gap and engine specification against the vehicle service information before installation. The SP1004 designation is also helpful when matching ignition service parts by part number.

What It Is Used For

• Replacing worn spark plugs that cause rough idle
• Restoring hard-start or extended-crank conditions
• Addressing misfire codes tied to ignition wear
• Improving spark consistency in high-mileage tune-ups
• Correcting drivability issues related to plug gap or electrode wear

Installation Notes and Tips

Confirm the exact year, make, model, engine, and plug gap before installation. Several listed applications use different gap specifications, including .044, .050, .051, .054, .032, .035, .028, and .025 inch settings. Use the vehicle’s service data to verify the correct gap for your application, and inspect ignition coils, boots, and wires during spark plug service.

Quality Assurance

SKP replacement ignition parts are built for direct-fit service across the listed applications. This spark plug is specified with an iridium tip and copper core construction to match the requirements of the supported vehicles.