Tuesday, November 18, 2014
How to Replace the Injectors on an E38
BMW based its 7 series of cars, made from 1994 to 2001, on its E38 platform. The 740I --- the most popular vehicle in the series --- featured an eight-cylinder, 4.4-liter engine. All of the engines in this series use fuel injection, which requires a fuel injector to deliver fuel to the engines at high pressure. The fuel injectors for the E38 incidents are part of the fuel rail assembly on top of the engine.
Instructions
- 1
Remove the upper intake manifold with a socket wrench and detach the electrical connectors for the fuel injectors. Disconnect the vacuum hose on the front of the fuel rail.
2Attach a pair of locking pliers to the adjustment screws on the hose clamps for the fuel return line on the fuel rail. Turn the screws counterclockwise to loosen the clamps and disconnect the fuel return line from the fuel rail. Remove the flare nut on the fuel line with a 12-millimeter socket and disconnect the fuel line from the fuel rail.
3Spray compressed air around the base of the fuel injectors to keep debris out of the injector ports. Remove the mounting bolts for the fuel rail with a 10-millimeter socket.
4Pad the corner of the valve cover with a clean shop towel and pry the fuel rail with a small pry tool to lift the injectors out of the manifold. Push the fuel lines to the side and remove the fuel rail assembly from the engine.
5Pull the fuel injectors from the fuel rail assembly and connect the new fuel injectors. Install the fuel rail assembly to the engine and fasten the mounting bolts for the fuel rail.
6Connect the fuel line to the fuel rail with the flare nut. Connect the fuel return line to the fuel rail by attaching the hose clamps and fasten the retaining screws on the clamps.
7Connect the vacuum hose to the front of the fuel rail and attach the electrical connectors to the fuel injectors. Replace the upper intake manifold with a socket wrench.
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