Bosch 9608 Spark Plug

Bosch OE Fine Wire Double Iridium Spark Plug 9608

Bosch 9608 is an OE Fine Wire Double Iridium spark plug built for direct replacement performance in select Ford, Lincoln, Mercury, and Mazda applications. It uses an ultra-fine iridium center electrode, a laser-welded tapered ground electrode, and a preset gap for consistent ignition and long service life.

OE Fine Wire Double Iridium Design

The Bosch OE Fine Wire Double Iridium line focuses on precise spark delivery and durability. The fine-wire iridium firing pin improves ignitability, while the laser-welded ground electrode with iridium alloy inlay is engineered for extended wear resistance. This design supports stable combustion in vehicles such as the Ford Mustang, Ford Crown Victoria, and Ford Ranger, especially where OE-style ignition performance matters.

• Part number 9608 for select Ford, Lincoln, Mercury, and Mazda applications
• Iridium center electrode tip with nickel-yttrium and copper core
• Laser-welded tapered ground electrode with iridium alloy inlay
• Preset 1.1 mm gap; do not gap before installation where noted
• Resistor plug with 6000 ohm resistance
• 4-cycle spark plug with tapered seat and non-projected insulator
• Compatible with OE-style ignition service on many V8 and V6 applications

Detailed Product Overview

Bosch 9608 is engineered as an OE-style replacement spark plug for vehicles that require a tapered-seat, preset-gap design. The ceramic insulator, platinum-iridium and nickel-ytytrium ground tip material, and fine-wire iridium center electrode work together to support reliable spark formation under everyday driving and higher-load conditions. This part number 9608 is a strong match for drivers servicing Ford E-150, Ford E-250, Ford F-150, Ford Mustang, and related applications listed below.

Vehicle Fitment

• Fits 2014 Ford E-150, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2014 Ford E-250, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2003-2004 Ford E-250, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2007-2012 Ford Mustang, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2003-2004 Ford Mustang, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2007-2011 Ford Crown Victoria, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 1996-2005 Ford Crown Victoria, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2006-2011 Lincoln Town Car, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2006-2011 Mercury Grand Marquis, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2001-2010 Ford Ranger, N/A. OE Fine Wire Double Iridium
• Fits 2005-2006 Ford GT, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2003-2004 Ford E-350 Club Wagon, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 1999-2004 Ford E-350 Super Duty, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2004 Ford F-150 Heritage, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2000-2003 Ford F-150, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 1997-2002 Ford E-250 Econoline, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 1997-2002 Ford E-350 Econoline Club Wagon, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 2002 Ford Expedition, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 1998-2000 Mazda B4000, N/A. Do Not Gap, Gap is Preset; OE Fine Wire Double Iridium
• Fits 1997-1999 Ford F-250, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium
• Fits 1997-1998 Ford E-350 Econoline, N/A. Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Double Iridium

Common Replacement Reasons

• Rough idle or inconsistent combustion on worn ignition components
• Hard starting caused by degraded spark plug electrodes
• Misfire codes related to worn or incorrect spark plug condition
• Loss of throttle response from weak spark delivery
• Service replacement for preset-gap OE-style ignition maintenance

Installation Notes

Verify the engine application before installation and confirm the plug matches the OE-style tapered seat and reach requirements. This Bosch 9608 spark plug is preset-gapped; do not adjust the gap on applications marked “Do Not Gap.” Use the correct torque procedure and inspect ignition boots, coils, and plug wells during service to help prevent repeat misfire concerns.

Quality Assurance

Bosch OE Fine Wire Double Iridium plugs are built around laser-welded electrode construction and iridium-based firing surfaces for consistent ignition performance and extended wear resistance. Part number 9608 is engineered for direct-fit service in the listed Ford, Lincoln, Mercury, and Mazda applications.