audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

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Checking injection quantity, freedom from leaks and spray pattern of injectors > < Removing and installing injectors Engine code letters: AMM, BDV

A4 Mk2

Motronic injection and ignition system (6-cyl.)
Servicing Motronic injection system
Removing and installing injectors Engine code letters: ASN, BBJ
 
A10-1032

Removing

  • ‒ → Pull off rear engine cover -arrows-.
 
A10-0993
  • ‒ → Screw out bolts for solenoid valve retaining plate -arrows-.
 
A10-1004
  • ‒ → Pull off front engine cover -arrows-.
 
A15-0684
  • ‒ → Unplug connector at intake manifold changeover valve -N156 -item 1-.
 
A24-0510
  • ‒ → Unplug all connectors at injectors; to do so, release connectors on underside -arrow-.
 
A24-0434
  • ‒ → Pull vacuum hose -3- off fuel pressure regulator.
  • ‒ Unscrew fuel rail from intake manifold -arrows-.

Note:

Replacement of fuel rail involves disconnecting fuel supply pipe -2- and return pipe -1-.

Attention:
Fuel system is pressurised. Wrap cloth around joint before opening system. Then dissipate pressure by carefully unfastening joint.
  • ‒ Evenly pull fuel rail upwards off intake manifold together with injectors and set it down on a clean cloth at the rear of the engine compartment.
  • ‒ Pull off clip and detach injector.

Installing

Install in reverse order, paying attention to the following:

  • ● Replace O-rings at all joints opened.
  • ● Moisten O-rings with fresh engine oil.
  • ● Make sure injectors are installed in correct position.
  • ● Make sure clips are properly connected.
  • ● Position fuel rail with secured injectors at intake manifold and press in evenly.

Tightening torque

Component

Nm

Fuel rail to intake manifold

10

Checking injection quantity, freedom from leaks and spray pattern of injectors > < Removing and installing injectors Engine code letters: AMM, BDV