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How to Change an A6 Injector

The fuel injectors for an Audi A6 deliver fuel to the engines cylinders in a specific sequence, allowing the vehicle to to be more responsive than its carburetted counterparts. The procedure for changing the fuel injectors is generally the same for all A6s.

Instructions

1

Turn off the ignition. Remove the fuse for the fuel pump, using the list on the fuse box as a guide. Start the engine and allow it to idle until it stalls. Turn the ignition off and disconnect the negative battery cable with a socket wrench. Replace the fuel pump fuse.

2

Wrap a clean shop rag around one of the fuel-line connections to the fuel rail. Loosen the retaining nuts for the fuel line with a socket wrench to relieve the pressure in the fuel tank. Properly dispose of the rag.

3

Remove the retaining nuts for the fuel lines, and detach the fuel lines from the fuel rail. Disconnect the mounting bolts for the fuel rail with a socket wrench, and remove the fuel rail from the intake manifold with the injectors still attached. Turn the fuel injectors counterclockwise to remove them from the fuel rail.

4

Mount a new lower gasket to the nozzle end of the fuel injectors. Clean the threads of the fuel injectors with a clean shop rag, and apply a thin layer of thread-lock compound to the threads. Screw the fuel injectors clockwise with a socket wrench to install them into the fuel rail, and mount a new upper gasket to the open end of the fuel injectors.

5

Mount the fuel rail to the intake manifold, and fasten the mounting bolts with a socket wrench. Connect the fuel lines to the fuel rail, and fasten the retaining nuts for the fuel lines. Reattach the cable for the negative battery terminal.