Power supply system specifications (Audi A4 B6)

Warning: Individual characteristics are also given in the text of the Chapter and, if their implementation is mandatory, are highlighted in bold

Fuel

Characteristic	Meaning
Fuel tank, l
capacity	70 (66 on all-wheel drive models)

Petrol models

Unleaded gasoline no worse than AI-95/A-85, temporary use of unleaded gasoline no worse than AI-91/A-82.5 is possible. In this case, engine power will decrease slightly, with an increase in fuel consumption.

Do not use fuel additives. They may cause increased wear or engine damage.

Diesel models

Summer and winter diesel fuel No.2 or No.1 according to ASTM D975.

Do not use ship's (Marine Diesel Fuel), boiler and similar diesel fuel.

When using diesel fuel with a sulfur content of more than 0.5%, change the engine oil every 7,500 km.

Winter fuel ensures normal operation down to -20°C.

Thanks to the fuel preheating when the vehicle's heating system is on, a vehicle running on winter diesel fuel can, as a rule, be operated without failure at outside temperatures down to -25°C.

Do not mix gasoline with diesel fuel.

When using summer diesel fuel, as well as at outside temperatures below -15°C, a certain amount of flow improver or kerosene, depending on the outside temperature, should be added to the fuel.



Flow improvers can also be used in combination with kerosene.

You can get a certificate of funds at the service station.

The proportion of additive, taking into account the outside air temperature, should be minimal.

The proportion of kerosene in the mixture should not exceed 50%.

Add the additive to diesel fuel until the diesel fuel loses its fluidity due to paraffin emission. Malfunctions due to paraffin emission can only be eliminated by heating the entire fuel system.

Mix diesel fuel with kerosene only in the fuel tank. To do this, first pour kerosene into the tank, and then add diesel fuel.

After this, the engine must run for some time so that the mixture is distributed throughout the fuel system.

Fire hazard! Kerosene additives lower the flash point of diesel fuel. This increases the danger when handling the fuel mixture. Observe the relevant safety regulations!

Petrol engine injection system

Electronic microprocessor distributed injection system (direct injection on the AWA engine) with a thermometric air mass meter, electronic accelerator. On the ALT engine - an intake manifold with variable geometry.

Engines 1.6, 2.0 l (ALT) 14 - 17

Characteristic	Meaning
Type
Engine 1.6 l	Simos
Engine 1.8 l	ME 7.5
2.0L Engine (AWA)	MED 7.1.1
Engine 2.0 l (ALT)	ME 7.5
Engines 2.4, 3.0 l	ME 7.1.1
Idle speed, in min.
Engine 1.6 l	700 - 840
Engine 1.8 l	740 – 860 (760 – 860 on all-wheel drive models)
2.0L Engine (AWA)	640 - 800
Engine 2.0 l (ALT)	700 - 960
Engines 2.4, 3.0 l	670 - 770
Maximum revolutions, in min
Engine 1.6 l	6500 - 6800
Engines 1.8, 2.4, 3.0 l	6800
Engine 2.0 l	6500
Fuel pressure, atm
At idle speed.
Engines 1.6, 2.0 l	about 3.5
Engine 1.8 l	about 4.0
Engines 2.4, 3.0 l	3.2 – 3.8
When the vacuum is turned off
Engines 1.6, 2.0l	about 4.0
Engines 2.4, 3.0 l	3.8 – 4.2
Residual, 10 minutes after engine shutdown
On a warm engine
Engines 1.6, 1.8, 2.0l	not less than 2.5
Engines 2.4, 3.0 l	about 2.2
On a cold engine
Engines 2.4, 3.0 l	about 3.0
From the fuel pre-pump (2.0L AWA engine)	about 6
From high pressure pump (2.0L AWA engine)
At idle speed	about 39
Maximum value	about 110
Injection volume, ml per 30 sec.
Engines 1.6, 2.0 l (ALT)	95±10
Engine 1.8 l	135±10
Engines 2.4, 3.0 l	90 - 125
Resistance of injector windings, Ohm at +20°C (on a warm engine it increases by 4 – 6 Ohm)
Engine 1.8 l	12 – 13
Engines 2.4, 3.0 l	13.5 – 15.5
Ignition sequence
4-cylinder engines	1-3-4-2
6-cylinder engines	1-4-3-6-2-5

Turbodiesel engine injection system

Electronic, microprocessor, EDC15+ on 1.9 l engines, with direct injection, rotary fuel injection pump on 2.5 l engines, turbocharger and cooling of the blown air.

Glow plugs

Characteristic	Meaning
Engine 2.5 l
Bosch	0250202102
Champion	CH215
Lucas/CAV	HDS342
Injector opening pressure (2.5L engine), atm
New	180-190
Used data	160

Idle speed, rpm

Characteristic	Meaning
Adjustment of the idle speed is not required as part of maintenance.
AVB Engine	865±75
AVF Engine	875±75
AYM, AKE engines	790±50
Maximum speed without load	5000±200
Cylinder firing order
4-cylinder engines	1-3-4-2
6-cylinder engines	1-4-3-6-2-5

Turbocharger boost pressure, atm, at rpm

Characteristic	Meaning
AVB Engine	1.9-2.1/3090
AVF Engine	2.1-2.6/3000
AYM, AKE engines	1.9-2.1/3000

Content in exhaust gases

Lambda value 0.97 – 1.03

Characteristic	Meaning
At idle
Gasoline engines CO₂, %	14.5 – 16.0
Diesel engines CO₂, %	9.8 – 10.8
Diesel smoke, no more than	2.0 (58%)
O ₂, %	0.1 – 0.5
CO in the exhaust pipe, %	max 0.5
NS, ppm	100
CO content at 2500 – 2800 rpm
CO, %	0.3
The meaning of lambda	0.97 – 1.03

Tightening force of threaded connections, Nm

Tightening torques for fasteners are also given in the text of the Chapter and in some illustrations*.

* Tightening moments highlighted in bold in the text must be strictly observed; efforts not shown in bold are only approximate.

Characteristic	Meaning
Intake manifold to cylinder head
Engines 1.6, 2.0 l	20
Engines 1.8, 2.4, 3.0, 4.2 l	10
Diesel engines 1.9 l	25
Diesel engines 2.5 l	10
Exhaust manifold to cylinder head
Petrol engines	25
Diesel engines 1.9 l	25
Diesel engines 2.5 l	22
Intake pipe to manifold
Engines 1.6, 1.8, 2.0 l	40
Engines 2.4, 3.0 l	25
Diesel engines	21
Fuel distribution line to intake manifold	10
Injector clamp
Diesel engines 1.9 l	12Nm+270°
Diesel engines 2.5 l	30
Union nut of the injector pipeline	30
Fuel injection pump gear
Diesel engines 2.5 l	22
Camshaft position sensor
Engine 1.6 l	13
Lambda probe
Engines 1.6, 1.8, 2.0, 3.0 l	50
2.4L engines	55
Knock sensor
Petrol engines	20