Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | MPI Fuel Injection and Ignition system | Mixture preparation system, electronic inj.,Gas | Vacuum diagram | Vehicles with automatic gearbox:

Ignition system, glow plug system > < Vehicles with manual gearbox:

MPI fuel injection and ignition system

Vacuum diagram

Vehicles with automatic gearbox:



Brake servo Non-return valve Vacuum unit ◆ For intake manifold changeover valve Non-return valve Throttle valve unit Ignition coils -N, -N128, -N158 Vacuum reservoir ◆ For intake manifold changeover valve Air cleaner



Intake manifold ACF sensor -G172 ◆ US vehicles only ACF Solenoid 1 -N80 Fuel pressure regulator T-piece ◆ For vehicles with air conditioner and/or EGR only Non-return valve T-piece ◆ For vehicles with air -conditioner only



To air conditioner Intake manifold changeover valve -N156 EGR valve -N18 ◆ US vehicles only Noise insulation Mechanical EGR valve ◆ US vehicles only

Power unit
MPI Fuel Injection and Ignition system
Mixture preparation system, electronic inj.,Gas
Vacuum diagram
Vehicles with automatic gearbox:

Ignition system, glow plug system > < Vehicles with manual gearbox: