Champion 9403 Spark Plug

Champion Iridium Spark Plug 9403

Champion Iridium 9403 is a tapered-seat spark plug built for precise ignition performance in a range of Chrysler, Dodge, and Jeep applications. It uses a fine-wire iridium center electrode with a platinum ground electrode to concentrate the spark for consistent combustion response.

For drivers searching for a Champion 9403 spark plug for Chrysler PT Cruiser, Dodge Ram 1500, or Jeep Grand Cherokee applications, this plug matches the RE14WMPB4 specification and supports direct-fit secondary ignition service.

Key Features

• Fine-wire iridium center electrode for sharp spark focus
• Platinum ground electrode core for durable ignition performance
• J-gap ground electrode tip design
• Pre-gapped at 0.045 in. / 1.15 mm
• Resistor-type spark plug for ignition system noise control
• Tapered seat design with 14 mm thread diameter and 0.984 in. reach
• Non-removable nut terminal and 5/8 in. hex size

Product Details

Champion Iridium is the brand’s iridium plug line, focused on precise spark delivery and stable operation under everyday driving conditions. Part number 9403 cross-references RE14WMPB4 for the same application. This spark plug is specified across multiple Chrysler, Dodge, and Jeep models, including Chrysler PT Cruiser, Dodge Charger, Dodge Ram 2500, and Jeep Wrangler applications.

Built with an iridium center electrode and platinum ground electrode, Champion 9403 is engineered around a fine spark point and a durable ground design. The plug’s tapered seat, resistor construction, and 14 mm thread size make it a direct-match service part for vehicles that call for the RE14WMPB4 plug type.

What It Helps Address

• Rough idle caused by worn spark plugs
• Hard starting from weakened ignition output
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from inconsistent combustion
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Fitment

• Fits 2001-2010 Chrysler PT Cruiser, N/A; gap 0.040 in. or 0.050 in. depending on engine application
• Fits 2001-2006 Chrysler Sebring, N/A; gap 0.040 in.
• Fits 2001-2003 Chrysler Voyager, N/A; gap 0.040 in.
• Fits 2005-2008 Chrysler 300, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2008 Chrysler 300, N/A; gap 0.050 in.
• Fits 2007-2008 Chrysler Aspen, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2006-2010 Jeep Grand Cherokee, N/A; 2 plugs per cylinder required; gap 0.050 in. or 0.044 in. depending on application
• Fits 2005-2008 Jeep Grand Cherokee, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2006-2008 Jeep Commander, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2003-2006 Jeep TJ, N/A; gap 0.040 in.
• Fits 2003-2006 Jeep Wrangler, N/A; gap 0.040 in.
• Fits 2003-2008 Dodge Ram 1500, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2003-2008 Dodge Ram 2500, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2003-2008 Dodge Ram 3500, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2004-2008 Dodge Durango, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2005-2008 Dodge Magnum, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2007-2008 Dodge Magnum, N/A; gap 0.050 in.
• Fits 2006-2008 Dodge Charger, N/A; 2 plugs per cylinder required; gap 0.044 in.
• Fits 2008 Dodge Charger, N/A; gap 0.050 in.
• Fits 2001-2007 Dodge Caravan, N/A; gap 0.044 in.
• Fits 2003-2005 Dodge Neon, N/A; gap 0.050 in.
• Fits 2001-2006 Dodge Stratus, N/A; gap 0.040 in.
• Fits 2002-2005 Jeep Liberty, N/A; gap 0.040 in.

Verify the specified gap for the exact vehicle application before installation. This part number is listed for multiple Chrysler PT Cruiser, Dodge Ram 1500, and Jeep Grand Cherokee configurations, so matching the engine callout and plug gap is important for correct service.

Quality Assurance

Champion Iridium 9403 is built to Champion’s published plug specifications, including iridium center electrode construction, platinum ground electrode core material, and RE14WMPB4 interchange coverage for listed applications.