Multi-Point Fuel Injection Specifications for Gasoline Engines (Audi A4 B5)

System type

• ADP Engine (1595 cm³) — Bosch Motronic 3.2
• AHL Engine (1595 cm³) — Simos
• ADR engine (1781 cm³) — Bosch Motronic 3.2
• AFY Engine (1781 cm³) — Bosch Motronic 3.2
• APT Engine (1781 cm³) — Bosch Motronic 3.2
• Engine APW(17B1 cm³) — Bosch Motronic 3.2
• AEB engine (1781 cm³) — Bosch Motronic 3.2
• AJL Engine (1781 cm³) — Bosch Motronic 3.2

Recommended fuel

Minimum octane rating:

• Engines ADP, AHL, ADR, APT, APW, AEB, AJL
• Best performance - 95
• Minor power loss - 91
• AFY Engine (equipped with a catalytic converter) — 88

Fuel system characteristics

Fuel pump type - Electric, submersible (in tank)

Fuel pump performance (battery voltage 12V) — 260 cm³/15 sec

Pressure generated by the pump at idle speed:

• Vacuum hose installed - 3.5 bar (approximate)
• Vacuum hose removed - 4.0 bar (approximate)

Minimum holding pressure (in 10 minutes) — 2.5 bar

Idle speed (not configurable, controlled by the electronic control unit):

• ADP, ADR (up to 06/96), AEB engines — 820...900 min⁻¹
• ADR engines (since 07/96), AFY, AEB, AJL — 780...900 min⁻¹
• AHI engines — 760...960 min⁻¹
• EnginesAPT, APW - 810...910 min⁻¹

CO content at idle (not configurable, control by commands from the control unit) — 0.1...1.1%

Electrical resistance of the injector (at room temperature):

• ADP motor - 14...16 Ohm
• ADR, AEB, AFY, AEB, AJL engines — 11...13 Ohm
• AHI motors - 14...17 Ohm
• Motors APT, APW - 12...13 Ohm

Engine speed sensor resistance:

• Motors ADP, ADR, AFY, AEB, AJL - 480...1000 Ohm
• AHL motors - 730...1000 Ohm
• Motors APT, APW - 450...1000 Ohm

Tightening torques for threaded connections Nm

Catalytic converter to turbocharger - 30

Cooling pipe to intake manifold (engines ADP, AEB, AJL) — 10

Return cooling pipe to turbocharger - 30

Turbocharger Cooling Feed Pipe - 25

Fuel rail to intake manifold - 10

Fuel tank filler neck - 25

Fuel tank mounting bolts - 25

Intake manifold:

• ADP, AHL — 20
• ADR, AFY, AEB, AJL — 10

Intake Manifold Support Bracket - 20

Lambda probe - 50

Return oil pipe to turbocharger - 10

Turbocharger Oil Feed Pipe - 25

Turbocharger bracket - 40