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Video Petrol Injection 1
Video Petrol Injection 2
Video Petrol Injection 3
Video Petrol Injection 4
Video Petrol Injection 5
Video B-Dir. Combustion
Video Dir. Petrol Injection 1
Video Dir. Petrol Injection 2
Video Dir. Petrol Injection 3
Video Dir. Petrol Injection 4
Video Dir. Petrol Injection 5
Video Petrol Injection Kugelf.
Video Homog. Working
Video Stratified-charge Oper.
Video Fuel Distrib.
Video Induction System
Video Petrol Injection Signal 1
Video Petrol Injection Signal 2
Video Idle Speed Device
Video Mass Air Flow Sensor 1
Video Mass Air Flow Sensor 2
Video Mass Air Flow Sensor 3
Video System Press. Reg. 1
Video System Press. Reg. 2
Video Injection Valve
Video Ind. Pulse Generator
Video Single Point Injection 1
Video Single Point Injection 2
Video Single Point Injection 3
Video Single Point Injection 4
Video Unregistrated Air
Video Lambda Sensor 1
Video Lambda Sensor 2
Video Lambda Sensor 3
Video Lambda Sensor 4
Video Lambda Sensor 5
Video Thermo Time Switch
Video Side-channel Pump
Video Peripheral Pump

Video First Fuel Pump
Video Petrol Injection Pump
Video D-Jetronic (MPI)
Video K-jetronic
Video KE-jetronic
Video KE-Jetroncic - Test, Diagn.
Video L-jetronic
Video LE-jetronic
Video LE-motronic
Video LH-jetronic
Video Vol. Air Flow Sensor
Video Idle Speed Device
Video Aux. Air Valve
Video Thermo Time Switch
Video Roller Vane Pump

Video Petrol injection 1
Video Petrol injection 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Injection Valve


According to the signal of the control unit the injector valve should supply all cylinders at once (throttle body fuel injection) or the cylinders individually (multi-position injection) with petrol.

How it works

While the injector of the throttle body injection is inserted above the throttle valve, the injectors of the multi-position injection (figures) are arranged at the end of the inlet manifold near the intake valves. Often they are connected directly to the distributor pipe (figure 2). Most often they are ground rated with 12 volts. Older systems inject all the fuel at once, in case there are more than four cylinders, it is done in two groups, half of the total quantity per crankshaft rotation. If the intake valve is closed for a short time, the fuel is stored.

Modern injectors inject the total quantity in the induction stroke or a little earlier (sequential) or, e.g., in two groups for four cylinder engines. The injection amount depends only on the injection pulse timing, because the opening cross section is fixed, as well as the pressure difference between injection pipe and inlet manifold. The starting point of the fuel injection is most always the same, while its end is shifted according to the demand. Injectors must be checked particularly in case of disturbances in terms of their density with running fuel pump and taken out plug.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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