Fuel and exhaust systems of a car Audi 80 B3, petrol
Fuel and exhaust system specifications
Air filter Type - Replaceable paper element, with automatic air temperature control on most models Filter element: Carburetor engines - Champion W102 1.6 liter...
Air filter Type - Replaceable paper element, with automatic air temperature control on most models Filter element: Carburetor engines - Champion W102 1.6 liter...
General description of the fuel system
The fuel system consists of a fuel tank mounted behind the rear seat, a mechanical fuel pump, and a downdraft carburetor or Bosch fuel injection system. The...
The fuel system consists of a fuel tank mounted behind the rear seat, a mechanical fuel pump, and a downdraft carburetor or Bosch fuel injection system. The...
Technical support
Perform the following procedures at the intervals given in the section " Maintenance ". Checking the idle speed and CO content 1. Follow the Chapter 16 or 23 ....
Perform the following procedures at the intervals given in the section " Maintenance ". Checking the idle speed and CO content 1. Follow the Chapter 16 or 23 ....
Air Filter Element — Replacement
1. A dirty air cleaner element will cause loss of power and increased fuel consumption, therefore it should always be replaced at the specified intervals. If...
1. A dirty air cleaner element will cause loss of power and increased fuel consumption, therefore it should always be replaced at the specified intervals. If...
Air filter — removal and installation
Carburetor models (and the RM engine with the Mono-Jetronic system) 1. Remove the element as described in Chapter 3 . 2. Remove the intake cover from the right...
Carburetor models (and the RM engine with the Mono-Jetronic system) 1. Remove the element as described in Chapter 3 . 2. Remove the intake cover from the right...
Automatic air temperature control
1. On some models, the air intake has an automatic temperature control system that is controlled by vacuum on carbureted and RM models, or a wax container on...
1. On some models, the air intake has an automatic temperature control system that is controlled by vacuum on carbureted and RM models, or a wax container on...
Mechanical fuel pump — removal and installation
1. The fuel pump is located on the left side of the engine and is driven by an eccentric on the intermediate shaft. 2. Loosen the clamps and disconnect the...
1. The fuel pump is located on the left side of the engine and is driven by an eccentric on the intermediate shaft. 2. Loosen the clamps and disconnect the...
Fuel filter — replacement
1. The fuel filter is installed on the fuel line. On carburetor engines, it is located near the fuel pump on the fuel supply line. On some engines with a fuel...
1. The fuel filter is installed on the fuel line. On carburetor engines, it is located near the fuel pump on the fuel supply line. On some engines with a fuel...
Fuel Pump (Fuel Injection Models) — Checking, Removing and Installing
1. Check that the fuse protecting the fuel pump circuit is not damaged. 2. Disconnect the high tension wiring from the ignition coil and ground it. 3. Block...
1. Check that the fuse protecting the fuel pump circuit is not damaged. 2. Disconnect the high tension wiring from the ignition coil and ground it. 3. Block...
Fuel Filter (Fuel Injection Models) — Replacement
1. Block the front wheels, then jack up the rear of the car and support it on axle stands. 2. Install clamps on the hoses that go to the fuel filter. 3....
1. Block the front wheels, then jack up the rear of the car and support it on axle stands. 2. Install clamps on the hoses that go to the fuel filter. 3....
Fuel tank — removal and installation
Note: For safety, the fuel tank should be removed in a well-ventilated area and never over an inspection pit. 1. Disconnect the negative battery cable. 2....
Note: For safety, the fuel tank should be removed in a well-ventilated area and never over an inspection pit. 1. Disconnect the negative battery cable. 2....
Fuel level sensor — removal and installation
Note: For safety reasons, the fuel level sensor should be removed in a well-ventilated area. 1. Disconnect the negative battery cable. 2. Remove the trim in...
Note: For safety reasons, the fuel level sensor should be removed in a well-ventilated area. 1. Disconnect the negative battery cable. 2. Remove the trim in...
Accelerator cable — removal, installation and adjustment
1. For models with automatic transmission, see. Section 7 . 2. For carbureted models, remove the air filter as described in Chapter 4 . 3. Disconnect the cable...
1. For models with automatic transmission, see. Section 7 . 2. For carbureted models, remove the air filter as described in Chapter 4 . 3. Disconnect the cable...
Throttle Cable — Removal, Installation and Adjustment
1. From inside the vehicle, use a small screwdriver to press the latch at the base of the choke control handle, then remove the handle (photo). 2. Unscrew and...
1. From inside the vehicle, use a small screwdriver to press the latch at the base of the choke control handle, then remove the handle (photo). 2. Unscrew and...
Accelerator pedal — removal and installation
1. Disconnect the cable from the pedal. 2. Use pliers to knock off the locking devices and remove the pedal (photo). 3. Remove the old locking devices and...
1. Disconnect the cable from the pedal. 2. Use pliers to knock off the locking devices and remove the pedal (photo). 3. Remove the old locking devices and...
Carburetor — general description
Keihin carburetor with downdraft and mechanical choke control. The primary throttle valve is opened mechanically, the secondary throttle valve is opened by...
Keihin carburetor with downdraft and mechanical choke control. The primary throttle valve is opened mechanically, the secondary throttle valve is opened by...
Carburetor — idle speed and mixture adjustment
Note: A tachometer and CO meter are required for precise adjustment. 1. The adjustment must be made: with a working air filter, with the accelerator cable...
Note: A tachometer and CO meter are required for precise adjustment. 1. The adjustment must be made: with a working air filter, with the accelerator cable...
Carburetor — removal and installation
1. Disconnect the negative battery cable. 2. Remove the air filter as described in Chapter 4 . 3. Disconnect the accelerator cable and throttle cable as...
1. Disconnect the negative battery cable. 2. Remove the air filter as described in Chapter 4 . 3. Disconnect the accelerator cable and throttle cable as...
Carburetor — disassembly, cleaning and assembly
Note: The following steps describe procedures for the Keihin I carburetor. Procedures for the Keihin II carburetor are similar, but refer to Figures 3.5-3.9 1....
Note: The following steps describe procedures for the Keihin I carburetor. Procedures for the Keihin II carburetor are similar, but refer to Figures 3.5-3.9 1....
Carburetor — additional adjustment and check
Increased idle speed 1. Connect the tachometer to the engine. Warm up the engine to operating temperature. 2. Remove the air filter and plug the vacuum hose to...
Increased idle speed 1. Connect the tachometer to the engine. Warm up the engine to operating temperature. 2. Remove the air filter and plug the vacuum hose to...
Fuel filter (carburetor engine) — removal and installation
1. The fuel filter is installed on the valve cover posts (photo). 2. Mark the location of the three fuel lines. The unmarked outlet line goes to the...
1. The fuel filter is installed on the valve cover posts (photo). 2. Mark the location of the three fuel lines. The unmarked outlet line goes to the...
Fuel Injection System — Description and Precautions
The Bosch fuel injection system used depends on the engine type and can be one of the following: K-Jetronic, Mono-Jetronic, KE-Jetronic, KE III-Jetronic,...
The Bosch fuel injection system used depends on the engine type and can be one of the following: K-Jetronic, Mono-Jetronic, KE-Jetronic, KE III-Jetronic,...
Fuel injection system parts — removal and installation
Air flow meter 1. Turn off the ignition, place a rag under the fuel inlet hose in the engine compartment, then loosen the connection and depressurize the...
Air flow meter 1. Turn off the ignition, place a rag under the fuel inlet hose in the engine compartment, then loosen the connection and depressurize the...
Fuel injection system — idle speed and mixture adjustment
Adjustment conditions 1. The engine must be warmed up to operating temperature. 2. All electrical components must be turned off, the radiator cooling fan must...
Adjustment conditions 1. The engine must be warmed up to operating temperature. 2. All electrical components must be turned off, the radiator cooling fan must...
Fuel injection system (K-Jetronic) — additional adjustment and testing
Idle Speed Block (dZ engine) 1. Two-way valve 1 (Fig. 3.29) increases the engine speed when it falls below 700 rpm. The control unit is located under the...
Idle Speed Block (dZ engine) 1. Two-way valve 1 (Fig. 3.29) increases the engine speed when it falls below 700 rpm. The control unit is located under the...
Fuel injection system (Mono-Jetronic) — additional adjustments and checks
Memory damage 1. The Mono-Jetronic system is equipped with a fault memory for reading coded data. In the event of a fault, a warning light is displayed on the...
Memory damage 1. The Mono-Jetronic system is equipped with a fault memory for reading coded data. In the event of a fault, a warning light is displayed on the...
Fuel injection system (KE-Jetronic) — additional adjustments and checks
Idle Speed Block (jN engine) 1. Be guided Chapter 24 . Lambda control (jN engine) 2. With the engine at normal operating temperature, connect the exhaust gas...
Idle Speed Block (jN engine) 1. Be guided Chapter 24 . Lambda control (jN engine) 2. With the engine at normal operating temperature, connect the exhaust gas...
Fuel injection system (KE III-Jetronic) — additional adjustments and checks
Memory damage 1. The KE III-Jetronic system is equipped with a fault memory common to the fuel injection system and the ignition system. The self-test...
Memory damage 1. The KE III-Jetronic system is equipped with a fault memory common to the fuel injection system and the ignition system. The self-test...
Fuel injection system (KE-Motronic) — additional adjustments and checks
Memory damage 1. The KE-Motronic system is equipped with a fault memory common to the fuel injection system and the ignition system. The self-test procedure is...
Memory damage 1. The KE-Motronic system is equipped with a fault memory common to the fuel injection system and the ignition system. The self-test procedure is...
Fuel Injection System (Multi-Point Injection/MPI) — Additional Adjustments and Checks
Memory damage 1. The multi-point injection (MPI) system is equipped with a fault memory common to the fuel injection system and the ignition system. The...
Memory damage 1. The multi-point injection (MPI) system is equipped with a fault memory common to the fuel injection system and the ignition system. The...
Injector Cooling Fan Motor — Removal and Installation
1. Disconnect the negative battery cable. 2. Disconnect the air ducts from each end of the fan motor (photo). 3. Disconnect the wiring. 4. Loosen the mounting...
1. Disconnect the negative battery cable. 2. Disconnect the air ducts from each end of the fan motor (photo). 3. Disconnect the wiring. 4. Loosen the mounting...
Emission Control Systems — General Description
Although proper ignition timing and mixture quality will minimize the amount of harmful gases released by the exhaust system, increasingly stringent...
Although proper ignition timing and mixture quality will minimize the amount of harmful gases released by the exhaust system, increasingly stringent...
Intake manifold — removal and installation
1. Remove the carburetor or throttle body assembly. 2. On carbureted models, drain the coolant from the system, then disconnect the coolant tubes and vacuum...
1. Remove the carburetor or throttle body assembly. 2. On carbureted models, drain the coolant from the system, then disconnect the coolant tubes and vacuum...
Exhaust manifold — removal and installation
1. Remove the intake manifold ( Chapter 32 ). 2. Unscrew the nuts and remove the exhaust manifold cover (photo). Disconnect the warm air hose. 3. Unscrew the...
1. Remove the intake manifold ( Chapter 32 ). 2. Unscrew the nuts and remove the exhaust manifold cover (photo). Disconnect the warm air hose. 3. Unscrew the...
Exhaust system — removal and installation
1. The exhaust system is shown in Fig. 3.42, 3.43 and 3.44. 2. Place the car over an inspection pit. Before unscrewing the nuts and bolts, soak them in oil to...
1. The exhaust system is shown in Fig. 3.42, 3.43 and 3.44. 2. Place the car over an inspection pit. Before unscrewing the nuts and bolts, soak them in oil to...
Troubleshooting — Fuel and Exhaust Systems
Excessive fuel consumption The mixture is not adjusted correctly The air filter element is clogged Fuel leak Incorrect upper float position (carburetor) The...
Excessive fuel consumption The mixture is not adjusted correctly The air filter element is clogged Fuel leak Incorrect upper float position (carburetor) The...
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