Bosch 9746 Spark Plug

Bosch OE Fine Wire Iridium Spark Plug 9746

Bosch 9746 is an OE Fine Wire Iridium spark plug built for consistent ignition performance and extended service life. It is a direct-fit option for select Ram 2500 and Ram 3500 applications, including 2014-2025 Ram 2500 and 2014-2025 Ram 3500 coverage shown below.

Key Features

• OE Fine Wire Iridium design with an ultra-fine center electrode firing pin for strong spark delivery
• Platinum-iridium center electrode tip material for durable ignition performance
• Projected ceramic insulator design
• Resistor spark plug with 6000 resistance
• Flat seat, 14 mm thread diameter, 26.5 mm reach, and 16 mm hex size
• Preset 1.1 gap; do not gap during installation on listed Ram applications
• Compatible with 4-cycle ignition systems

Product Details

The Bosch OE Fine Wire Iridium line focuses on OE-style ignition performance with a fine-wire center electrode that helps maintain a stable spark under demanding engine conditions. Bosch 9746 uses a platinum-iridium tip construction, nickel-yttrium and copper core materials, and a ceramic insulator to support reliable combustion in the specified Ram truck applications. This spark plug is listed for 2022-2025 Ram 2500 and Ram 3500, plus 2014-2021 Ram 2500 and Ram 3500 models with dual spark plugs and a preset gap.

This part cross-references no listed interchange numbers for the same application.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Misfire conditions related to aged ignition components
• Reduced throttle response from degraded combustion efficiency
• Service intervals that call for OE-style replacement spark plugs

Installation Notes

• Fits 2022-2025 Ram 2500, N/A
• Fits 2022-2025 Ram 3500, N/A
• Fits 2014-2021 Ram 2500, N/A; do not gap, gap is preset; with dual spark plugs; original center electrode material is iridium
• Fits 2014-2021 Ram 3500, N/A; do not gap, gap is preset; with dual spark plugs; original center electrode material is iridium
• Verify engine configuration and follow the vehicle service procedure before installation

Quality Assurance

Bosch builds the OE Fine Wire Iridium line to OE-level specifications for ignition service on the listed Ram 2500 and Ram 3500 applications. Part number 9746 is engineered around the stated electrode materials, heat range 8, and preset gap requirements for proper fitment and operation.