Fuel system (gasoline) of the car Audi 80 B3

Fuel system. General information
The fuel system includes the fuel tank, fuel lines, fuel filter, fuel pump and carburetor or injection device with air filter. AUDI 80 engines with a power of...

Possible malfunctions in fuel supply of carburetor systems
If there are any problems with the fuel supply, the system should be checked in the following order: Check if there is fuel in the tank. Remove the fuel hose...

Removal and installation the air filter
Removal Unscrew the 2 air filter cover bolts. Open the lock and remove the air filter cover. Remove the filter element. Unscrew the 3 filter housing fastening...

Checking the intake air heating
The intake air heating is controlled by a vacuum device, an air damper in the intake air pipe, depending on the temperature. If the device is faulty, the...

Removal and installation the fuel pump
The fuel pump is located on the side of the cylinder block and is driven by an auxiliary shaft. Caution: If the fuel pump membrane is damaged, this will cause...

Fuel level indicator sensor
The fuel level indicator sensor is mounted on top of the gas tank. It consists of a float and a potentiometer. When the fuel level drops, the float also drops....

Carburetor Keihin I and Keihin II
1 - upper part of the carburetor 2 - air damper lever 3 - bolt 4 - cotter pin 5 - washer 6 - connecting rod 7 - fastening bolt, 5 Nm. Coat the bolts with...

Checking and adjusting the idle speed and CO content of Keihin carburetors
Warm up the engine. Oil temperature +60°C. Turn off all electrical consumers, including the air conditioner. Connect the tachometer. Attention: connection must...

Adjusting the gas drive of Keihin carburetors
Caution: The gas actuator is very sensitive to bending and therefore requires special handling during installation. The slightest bending may lead to...

Adjusting the starting (air) damper drive of Keihin carburetors
Push the starting choke handle all the way into the instrument panel. Keihin-I carburetor Carburetor Keihin-ll Screw the 10 mm drive with the gap "a" into the...

Checking and adjusting the amount of fuel injected into Keihin carburetors
The amount of fuel injected by the accelerator pump should be checked if the fuel consumption is too high, there are dips in gas supply, poor throttle response...

Checking and adjusting the fast idle speed of Keihin carburetors (when warming up the engine)
The throttle clearance can be adjusted by adjusting the fast idle speed. The carburetor does not need to be removed for adjustment. The fast idle speed should...

Checking and adjusting the air-mixture gap of Keihin carburetors
The air damper clearance should be adjusted after repairing the carburetor or after removing the upper part of the carburetor and if the cold engine does not...

Checking the vacuum opening device of the air damper of Keihin carburetors («Pulldown»)
The opening membrane should be checked for leaks if the cold engine does not accept gas well or if there are dips in transient modes. Keihin-I carburetor...

Checking the idle shut-off valve of Keihin carburetors
The idle cut-off valve closes the supply of idle fuel mixture and additional mixture to the mixing chamber when the ignition is switched off. This prevents the...

Checking the intake manifold heating of Keihin carburetors
To stabilize engine operation during warm-up, an electric heater is installed in the intake manifold. The heater heats up and gives off its heat to the...

Carburetor 2-EE
The 2-EE carburetor is an electronically controlled carburetor with a falling flow and sequential inclusion of mixing chambers. There are no previous devices...

Checking the idle speed, adjusting the CO content of carburetors 2-EE
The 2-EE carburetor does not have an idle speed adjustment bolt. The idle speed is set by the Ecotronic control unit, no separate adjustment is required. The...

Checking the idle speed of 2-EE carburetors
Check conditions: ignition timing is correct, exhaust system is tight, fuel pump relay and malfunction indicator lamp are normal. Warm up the engine and stop,...

Checking the CO content of 2-EE carburetors
The CO content is coded by the number of flashes of the malfunction indicator lamp or the diode test lamp. Turn off the ignition and leave it off for at least...

Adjusting the CO content of 2-EE carburetors
Disconnect the plug connection of the lambda probe cable. Insulate the connection point with electrical tape. Caution: The plug on the green wire to the...

Checking the temperature sensor (K-, KS-Jetronic, KE-Motronic, Mono-Jetronic, Ecotronic)
The temperature sensor is located at the top or bottom of the cooling system flange, depending on the engine model. It informs the engine management system...

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80(B4, 1991-1996)

80(B3, 1986-1991)

80(B3, 1986-1991, petrol)

80(B2, 1979-1986)