Open Fuel Injectors, Checking: Procedure

WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .

-- Clean all fuel rail connections with engine or brake cleaner and dry off.

CAUTION:

Danger of malfunction caused by dirt.

Observe. Refer to appropriate service information.

Check One Cylinder After Another.

Starting with cylinder 1.

-- Remove the fuel supply hoses from the fuel injectors to be checked by pressing both retaining straps down while pulling up on the center piece to release in direction of -arrow-.

Courtesy of AUDI OF AMERICA, LLC

NOTE:

The illustration shows cylinder bank 1.

-- Connect the :VAS6213 with the custom adapter, to the return connection from the injector to be tested.

-- A vacuum pressure of -500 mbar (-7.25 psi) is applied using the :VAS6213 .

Fuel injectors are OK when the pressure remains constant for about 30 seconds.

If an injector is faulty, then the pressure will drop to 0 bar again within 2 to 3 seconds.

Repeat the test if necessary. Watch the :VAS6213 for a loss of pressure.

-- Replace any defective fuel injectors. Refer to FUEL INJECTORS, REMOVING AND INSTALLING .