Ford 5.8L EFI Deposit Resistant Injector (DRI) Diagram & Description - E4OD

This scanned manual page describes the Deposit Resistant Injector (DRI) fitted to some vehicles equipped with 5.8L EFI engines and the E4OD transmission. The text explains that the DRI was designed to eliminate the lean fuel delivery problems that occur with conventional multi-port fuel injectors when low grade, non-detergent fuels are used. Unlike a conventional injector, the DRI has no pintle on the tip of the needle; instead, it meters fuel through four small holes in a metering plate on the end of the injector. Because baked-on fuel deposits that coat the injector tip over time do not reduce the metering area of these small holes, the injectors maintain proper fuel metering characteristics regardless of fuel quality and do not deteriorate lean as conventional injectors do. The page includes a cutaway line drawing of the injector with callouts identifying the needle, the director/metering plate (single/multi-hole shown in a magnified circle), and the DRI metering assembly (also magnified). The illustration carries the figure reference V8012-1A. A reader learns how to identify a DRI injector, why Ford used this design, and how its metering plate design differs functionally from pintle-type injectors.