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Champion 9406 Spark Plug
| Brand | Champion 9406 |
|---|---|
| Center Electrode Tip Material | Iridium |
| Classification | Champion Iridium |
| Electrical Terminal Type | Non-Removable Nut |
| Ground Electrode Core Material | Platinum |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | J Gap |
| Hex Size | 0.546 |
| Hex Size | 14.000 |
| Hex Type | Hex |
| Insulator Height | 0.14 |
| Manufacturer Heat Range | 8 |
| Plug Type | RET8ZWMPB4 |
| Pre-Gap Size | 0.041 |
| Pre-Gap Size | 1.15 |
| Resistor Type | Yes |
| Seat Type | Tapered |
| Thread Diameter | 0.470 |
| Thread Diameter | 12.000 |
| Product line | Champion Iridium |
| Fits | Ford, Lincoln, Mercury, and Avanti · 44 vehicles |
Iridium center electrode. Fine-wire design delivers a sharp spark focus for stronger performance.
Platinum ground electrode. Built with a platinum tip for consistent ignition performance.
Champion Iridium. Premium spark plug line from a trusted ignition brand.
Cross-references HJFS24FP and RET8ZWMPB4 for the same application. See all 2.
Champion Iridium 9406 Spark Plug Overview
Champion Iridium 9406 is a secondary ignition spark plug built for direct-fit applications across select Ford, Lincoln, and Mercury vehicles. It uses a fine-wire iridium center electrode with a platinum ground electrode to sharpen spark focus and support consistent combustion performance.
The Champion Iridium line is positioned for drivers who want a precise OE-style spark plug design with durable electrode materials and a tapered seat configuration. Part number 9406 is listed for multiple 2008-2014 Ford Expedition, Explorer, F-150, F-250 Super Duty, F-350 Super Duty, Mustang, and related Lincoln Navigator and Mercury Mountaineer applications.
Key Features
- Champion Iridium spark plug, part number 9406
- Iridium center electrode tip material for fine-wire spark delivery
- Platinum ground electrode core material for durable ignition performance
- J-gap ground electrode tip design
- Pre-gapped at 0.041 in / 1.15 mm
- Resistor type plug with non-removable nut terminal
- Tapered seat design with 12 mm thread diameter and 14 mm hex size
- Heat range 8 for specified OE-style applications
Product Details
Champion Iridium 9406 is engineered around a fine-wire iridium center electrode and a platinum ground electrode to concentrate the spark and maintain stable ignition characteristics. The tapered seat, resistor design, and J-gap configuration align with the listed OE-style applications, including Ford F-150, Ford Mustang, Ford Expedition, Lincoln Navigator, and Mercury Mountaineer fitments. If you are replacing worn plugs in a 2008-2014 Ford Expedition or a 2009-2010 Ford F-150, this plug matches the specified application details and plug type references for those vehicles.
This part cross-references HJFS24FP and RET8ZWMPB4 for the same application.
What It Helps Address
- Rough idle caused by worn spark plug electrodes
- Misfire conditions related to weak or inconsistent spark
- Hard starting from degraded ignition performance
- Reduced throttle response from aged secondary ignition components
- Maintenance replacement for specified Ford, Lincoln, and Mercury engine applications
Installation Notes
Verify the vehicle’s engine code, cam cover date, and plug type before installation, especially on 2008 applications with OE brown coil boots and the listed gap requirements. Confirm the specified gap and seat style against the service information for your exact vehicle before torquing the plug into place. This plug is listed for N/A position applications only.
Quality Assurance
Champion Iridium 9406 is built with iridium and platinum electrode materials for durable ignition service in the listed applications. The product line is designed around precise spark focus and OE-style fitment requirements for compatible Ford, Lincoln, and Mercury vehicles.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2014 | Ford | Expedition | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2014 | Lincoln | Navigator | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2013 | Ford | Expedition | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2013 | Lincoln | Navigator | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2012 | Ford | Expedition | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2012 | Lincoln | Navigator | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2011 | Ford | Expedition | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2011 | Lincoln | Navigator | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | Expedition | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | Explorer | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | Explorer Sport Trac | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | F-150 | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | F-150 | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | F-250 Super Duty | 6.8L | V10 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | F-250 Super Duty | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | F-350 Super Duty | 6.8L | V10 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | F-350 Super Duty | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Ford | Mustang | 4.6L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Lincoln | Navigator | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2010 | Mercury | Mountaineer | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | Expedition | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | Explorer | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | Explorer Sport Trac | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | F-150 | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | F-150 | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | F-250 Super Duty | 6.8L | V10 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | F-250 Super Duty | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | F-350 Super Duty | 6.8L | V10 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | F-350 Super Duty | 5.4L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Ford | Mustang | 4.6L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Lincoln | Navigator | 5.4L | V8 | N/A | Gap 0.042 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2009 | Mercury | Mountaineer | 4.6L | V8 | N/A | Gap 0.041 (in); Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | Expedition | 5.4L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | Explorer | 4.6L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 11/30/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | Explorer Sport Trac | 4.6L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 11/30/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | F-150 | 5.4L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | F-250 Super Duty | 6.8L | V10 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | F-250 Super Duty | 5.4L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | F-350 Super Duty | 6.8L | V10 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | F-350 Super Duty | 5.4L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Ford | Mustang | 4.6L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 11/30/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Lincoln | Mark LT | 5.4L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Lincoln | Navigator | 5.4L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 10/09/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
| 2008 | Mercury | Mountaineer | 4.6L | V8 | N/A | Match to Original; Gap 0.044 (in); with OE Brown Coil Boots; with 12 (mm) Diameter Threads Below Seat; Cam Cover Date After 11/30/2007; Plug Type Number RET8ZWYPB; Champion Iridium |
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