Before installing injector in engines that have been run

• Check injector bore for dirt.

  Clean only dirty  injector bores.

  IMPORTANT: do not damage injector!
• Clean injector bore: To do so, preferably slide injector without decoupling element (2) but with new Teflon ring (1) in and out of injector bore several times.

  The Teflon ring must subsequently be replaced.

  Fig 1: Identifying Teflon Ring And Uncoupling Element

  Courtesy of BMW OF NORTH AMERICA, INC.
• Clean contact surfaces of uncoupling elements (2) in cylinder head.
• Replace decoupling element (2).

An injector quantity compensation must be carried out if an injector is replaced or changed on the cylinder side.

Injector quantity compensation is carried out with the aid of a so-called adjustment value.

The adjustment value is printed in two blocks of three digits on the injector.

The adjustment value must be read off before  installation!

Fig 2: Identifying Adjustment Value Printed In Blocks Of Digits On Injector

Courtesy of BMW OF NORTH AMERICA, INC.

Enter the adjustment value according to the installation location (cylinder) of the injector.

If injector quantity compensation is not carried out, the engine may run roughly or fail to start.

Description of injector quantity compensation at end of instructions.

Fig 3: Identifying Adjustment Value Printed In Blocks Of Digits On Injector

Courtesy of BMW OF NORTH AMERICA, INC.