Is your Nissan Pickup or D21 running rough, misfiring, or getting poor fuel economy? These Motoforti fuel injectors might be the solution. This set includes 4 brand new injectors designed to replace OEM part 16600-86G00, specifically for the 2.4L inline-4 engine in 1990-1995 Nissan Pickups/D21s. They feature a single-hole disc design, 12V operation, 2-pin connectors, and come with O-rings pre-installed (red and silver tone). Why replace them? Over time, injectors can clog or wear out, leading to uneven fuel spray, hard starts, and reduced performance. These high-impedance injectors are built for efficient fuel delivery, which can mean better cold starts, improved fuel economy, and smoother engine operation. Important note: Professional installation is highly recommended! Fuel injectors affect your engine's air/fuel ratio, and new injectors often require an updated tune for optimal performance. Also, check other engine components (like fuel pressure regulator, filters) before installation. Follow the step-by-step instructions (disconnect battery, remove fuel rail, swap injectors, etc.) and always check for leaks afterward. If you're restoring an old truck or tackling engine repairs, this affordable 4-pack gives you everything you need for a complete fuel system refresh.