Starting from 7/92, AUDI 80 cars are equipped with two-stage nozzles, which are distinguished by an enlarged body. More reliable is their recognition by article number. Injectors designed for installation on cars manufactured before 6/92 have the number 068 130 202 E, and for cars manufactured after 7/92 - 028 130 201 B (see illustration 3.0b).
The nozzle needle is cooled and lubricated by diesel fuel. Due to the fact that not all fuel is injected into the combustion chambers of the cylinders, the remaining part of it is diverted back to the fuel tank (see illustration 3.0c).
The nominal value of the time interval from the start of fuel injection to ignition of the mixture is 0.002 seconds. The slightest deviation due to various reasons, including poor mixture formation, uneven fuel supply, leads to a decrease in the effective engine power and / or to the appearance of so-called detonation knocks.
Diesel engines, which are equipped with AUDI 80 cars, do not have knock knocks during normal operation. They can only be felt when starting a cold engine.
However, if detonation knocks are heard when the engine is warm, then the reason for this is the delay in ignition of the mixture, i.e. the time interval between the start of injection and ignition of the mixture is too long.
The reasons for this behavior of the engine can be:
- jamming of the nozzle needle;
- fuel waxing, for example, when using the summer type in cold weather;
- too high load at low speeds;
- too low compression.
A faulty injector can be identified with the engine running by loosening the union nut on the fuel feed wire of each injector in order. If, when loosening the union nut of the fuel line of the corresponding injector, the idle speed does not change and remains constant, then this injector is faulty.
A defective injector can manifest itself in the following:
- constant failure of the glow plug. The time interval between the forced replacement of candles is very short.
- black exhaust outlet.
- high fuel consumption.
- engine overheating.
- strong knocks.
- drop in engine power.
- uneven running of the engine.
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