# NGK Iridium IX Spark Plug Box of 4 (TR5-1IX) NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug. - RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs - Trivalent metal plating for superior anti-corrosion and anti-seizing properties - Outstanding acceleration, high fuel efficiency and durability - Fine iridium tip ensures durable and consistent spark This Part Fits: Year Make Model Submodel 1986-1987 Ford Aerostar Base 1986-1987 Ford Aerostar XL 1986-1987 Ford Aerostar XLT 1983-1985,1990 Ford Escort Base 1984-1988 Ford Escort GL 1983 Ford Escort GLX 1983-1990 Ford Escort GT 1985-1986 Ford Escort L 1983-1986,1988-1990 Ford Escort LX 1990 Ford Escort LX Sport 1986-1990 Ford Escort Pony 1983-1985,1988 Ford EXP Base 1983 Ford EXP GT 1983-1988 Ford EXP Luxury 1986-1988 Ford EXP Sport 1983 Ford Fairmont Futura 1983 Ford Fairmont S 1983-1986 Ford LTD Base 1983-1986 Ford LTD Brougham 1983 Ford Mustang GL 1983 Ford Mustang GLX 1983-1984 Ford Mustang L 1984-1990 Ford Mustang LX 1983,1985-1986 Ford Ranger Base 1987-1988 Ford Ranger Custom 1984,1986,1988 Ford Ranger S 1986-1988 Ford Ranger STX 1983-1986 Ford Ranger XL 1983-1985 Ford Ranger XLS 1983-1988 Ford Ranger XLT 1984 Ford Thunderbird Base 1984 Ford Thunderbird Elan 1984 Ford Thunderbird Fila 1984 Ford Thunderbird LX 1984 Ford Thunderbird Sport 1983 Mercury Capri Base 1983 Mercury Capri Black Magic 1983 Mercury Capri Crimson Cat 1983-1986 Mercury Capri GS 1983 Mercury Capri L 1983-1984 Mercury Cougar Base 1983-1984 Mercury Cougar LS 1983 Mercury LN7 Base 1983 Mercury LN7 Grand Sport 1983 Mercury LN7 RS 1983 Mercury LN7 Sport 1982-1986 Mercury Lynx Base 1982-1985 Mercury Lynx GL 1982-1987 Mercury Lynx GS 1982,1985-1987 Mercury Lynx L 1982-1984 Mercury Lynx LS 1983-1984 Mercury Lynx LTS 1982-1984 Mercury Lynx RS 1985-1987 Mercury Lynx XR3 1983-1986 Mercury Marquis Base 1983-1986 Mercury Marquis Brougham 1983 Mercury Zephyr Base 1983 Mercury Zephyr GS 1983 Mercury Zephyr Z7 1983 Mercury Zephyr Z7 GS ## Details - **Price:** 74.61 CAD - **Vendor:** NGK - **Type:** Spark Plugs ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 74.61 CAD | In stock | ## Images - Photo - Primary - Photo - Primary - Photo - out of package - Photo - out of package --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/ngk-iridium-ix-spark-plug-box-of-4-tr5-1ix) > Updated: 2026-06-27