Vehicle MPI and MPFI injection system Audi 100 C4, petrol

Multi-point injection
The 2.8-liter 6-cylinder engine is equipped with an injection system with the designation MPI. Behind this abbreviation are the English words Multi Point...

Additional functions
MPI/MPFI is a very complex injection system, the control unit of which additionally includes an electronic ignition system. The control unit for the MPI/MPFI...

The main elements of the injection system MPI and MPFI
In order to better understand the overall functioning of this injection system, it is necessary to first become familiar with the individual tasks of the...

Operating procedure
Interaction of constituent elements The pistons that rise and fall while the engine is running draw in air. If you fully depress the accelerator pedal, then...

Lambda regulation
The catalytic converter can only work correctly if the excess air ratio l is as close to 1 as possible, which corresponds to a fuel/air ratio of 14.7:1. To...

Malfunctions and self-diagnosis
The injection system control unit can recognize and record exactly 30 types of malfunctions in the memory of the fault memory. In this case, it is fixed:...

Self repair
Operating procedure Practice shows, however, that in any case, problems on this side are extremely rare. Sensors, switches and wire connections are much more...

Visual check
First, check the air ducts for leaks! All hoses from the thick air intake hose to the thin vacuum hoses must be checked. Are the injection nozzle seals and...

Checking individual elements
Checking injection nozzles If you have a suspicion that one of the injectors is not working, it is easy to check with an LED voltmeter and an accurate...

Removal of elements of the injection system MPI and MPFI
Many components of the injection system do not require any additional dismantling instructions. Exceptions are described in the following sections. Removing...

Cable drive «gas»
Installation and adjustment are described at the end of the chapter «Mono-Motronic injection system». Plug-in connections at the rear in the engine...

Idle check and exhaust gas analysis
MOT No. 7 6-cylinder engines are equipped with automatic control of the engine speed in idle mode. There is no adjustment bolt, so there is nothing to adjust....

List of faults

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Similar sections of other Audi car models:
Power unit: MPI and MPFI injection system Audi A4 B5 (1994-2001, petrol)
Engine repair: MPI/MPFI injection system Audi A6 C4 (1994-1997)

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