Vehicle MPI and MPFI injection system Audi A4 B5, petrol
MPI and MPFI injection system
Gasoline consumption High-tech Audi engines are also helped by electronics to "curb the thirst" of the engine a little. At cruising speed, the Audi can get by...
Gasoline consumption High-tech Audi engines are also helped by electronics to "curb the thirst" of the engine a little. At cruising speed, the Audi can get by...
Additional MPI/MPFI functions
MPI/MPFI is a very expensive injection system, the control unit of which additionally controls the electronic ignition. The MPI/MPFI injection system control...
MPI/MPFI is a very expensive injection system, the control unit of which additionally controls the electronic ignition. The MPI/MPFI injection system control...
Injection system components
In order to better understand the functioning of the injection system as a whole, it is first important to learn about the tasks of its individual components....
In order to better understand the functioning of the injection system as a whole, it is first important to learn about the tasks of its individual components....
Functioning of the injection system
Coordinated operation of individual parts When the engine is running, the pistons rising and falling in the cylinders suck in air. If you fully depress the gas...
Coordinated operation of individual parts When the engine is running, the pistons rising and falling in the cylinders suck in air. If you fully depress the gas...
Adjustment using a lambda probe
The catalytic converter can only operate effectively if the relative air quantity λ (lambda) is as close to 1 as possible. To achieve this, the MPI/MPFI...
The catalytic converter can only operate effectively if the relative air quantity λ (lambda) is as close to 1 as possible. To achieve this, the MPI/MPFI...
MPI/MPFI malfunctions and self-diagnosis
The MPI/MPFI control unit can detect about 30 faults in the electrical components of the ignition/injection system and store them in the computer memory. A...
The MPI/MPFI control unit can detect about 30 faults in the electrical components of the ignition/injection system and store them in the computer memory. A...
Self-diagnosis of the injection system
Mode of action Unfortunately, many types of checks are not available to the amateur due to the lack of necessary control devices. However, there is still a...
Mode of action Unfortunately, many types of checks are not available to the amateur due to the lack of necessary control devices. However, there is still a...
Visual inspection of the MPI/MPFI injection system
1. Check the air hoses for leaks. You need to check all the hoses - from the thick air intake hose to the small vacuum hose from the pressure regulator. 2. In...
1. Check the air hoses for leaks. You need to check all the hoses - from the thick air intake hose to the small vacuum hose from the pressure regulator. 2. In...
Checking the injection system components
The following sections describe tests of injection system components that can be performed using amateur tools. Injection valves If you suspect that one of the...
The following sections describe tests of injection system components that can be performed using amateur tools. Injection valves If you suspect that one of the...
Dismantling individual parts of the injection system
Many injection system components do not require additional disassembly descriptions. Exceptions are described in the following sections. Replacing the lambda...
Many injection system components do not require additional disassembly descriptions. Exceptions are described in the following sections. Replacing the lambda...
Throttle cable
Throttle control parts in the engine compartment of a six-cylinder engine 1 - nipple at the end of the throttle cable; 2 - throttle lever; 3 - throttle cable;...
Throttle control parts in the engine compartment of a six-cylinder engine 1 - nipple at the end of the throttle cable; 2 - throttle lever; 3 - throttle cable;...
Idle speed adjustment
All Audi A4 models have automatic idle speed adjustment. There is no longer a setting screw that can be used to adjust anything. If the idle speed is...
All Audi A4 models have automatic idle speed adjustment. There is no longer a setting screw that can be used to adjust anything. If the idle speed is...
Exhaust gas testing
Everything you need to know about exhaust gas testing can be found in the section Motronic injection system . Tip: Disconnecting the battery erases the idle...
Everything you need to know about exhaust gas testing can be found in the section Motronic injection system . Tip: Disconnecting the battery erases the idle...
Help with MPI/MPFI faults
Malfunction Its reasons Your help A. Cold engine does not start or starts poorly 1. Defective fuse 13, 21, 25, 27 or 28 2. The fuel pump relay is faulty 3. The...
Malfunction Its reasons Your help A. Cold engine does not start or starts poorly 1. Defective fuse 13, 21, 25, 27 or 28 2. The fuel pump relay is faulty 3. The...
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Similar sections of other Audi car models:
Power unit: MPI and MPFI injection system Audi 100 C4 (1990-1994, petrol)
Engine repair: MPI/MPFI injection system Audi A6 C4 (1994-1997)
Power unit: MPI and MPFI injection system Audi 100 C4 (1990-1994, petrol)
Engine repair: MPI/MPFI injection system Audi A6 C4 (1994-1997)
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