Schematic of K-Jetronic
1 - mixture regulator
1a - air quantity meter
1b - fuel dispenser
1c - CO adjustment screw
2 - gas tank
3 - electric fuel pump
4 - fuel pressure accumulator
5 - fuel filter
6 - pressure regulator in the system
ba - valve
7 - injection valve
8 - idle speed adjusting screw
9 - battery
10 - ignition switch
11 - fuel pump relay
12 - ignition distributor
13 - cold start valve
14 - thermal sensor-switch
15 - additional air spool
16 - heating regulator
16a - full load diaphragm
K-Jetronic is a mechanical injection system that continuously injects fuel into the intake manifold ahead of the injection valve. The mechanical basis corresponds in many respects to KE-Jetronic. Some operating recommendations are given in the KE-Jetronic chapter.
The pressure accumulator keeps the fuel under pressure, also for a long time after the engine has been switched off. This prevents the formation of vapor locks and improves the hot start mode.
The fuel pump relay provides the fuel pump, secondary air spool, and warm-up control. The relay exceeds the current supply to the pump when the ignition is turned off and if no more ignition pulses are generated (Engine stopped, ignition off). In addition, the relay interrupts the fuel supply when the highest speed of 6500-6700 rpm is reached, until the speed drops.
The cold start valve injects extra fuel on a cold engine during start up into the intake manifold to make the engine start more easily.
The thermal time switch regulates the injection time of the cold start valve.
The system pressure regulator maintains a pressure of 5.2-5.9 bar.
The thermoelectric spool for additional air stabilizes the speed when the engine warms up.
The warm-up regulator enriches the mixture during warm-up.
Attention: When working on the mechanical injection system, impeccable cleanliness must be observed. Before removing the parts, clean them with petrol. The system is under pressure. Therefore, before replacing parts, slowly loosen the cold start valve to reduce pressure. At the same time, wrap the fuel system pipe with a rag, because. fuel may squirt out. Remove escaping fuel with a cloth.
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