![]() AutoHex (Auto Diagnostic scanner) is one of the best Professional scan tools to for Cars Autohex Scanner can test the Systems of the Car effectively and easily, with many powerful features to help you in diagnosing and testing. This is, however, determined by flow rate of the injector and operating pressure of the fuel. Because of the frequency of the firing of the injectors, a sequential injector normally has twice the duration, or opening time, of a simultaneous pulse. In the case of a Jaguar V12 the injectors are fired in 4 groups of 3 injectors. The fuel is delivered to each bank alternately. Multi point Sequential Injection System (EVO Gas) Why you are selected this system Direct gas injection like octane 40 less fuel consumption than. It is also common for injectors to be fired in (banks) on (V) configuration engines. This individual firing allows the system, when used in conjunction with a phase sensor, to deliver the fuel when the inlet valve is open and the incoming air helps to atomize the fuel. Sequential injection, as with simultaneous, has a common supply to each injector, but unlike simultaneous, has a separate earth path for each injector. With simultaneous injection the injectors are wired in parallel and all fire together at the same time. Depending on the system encountered, the injectors can fire either once or twice per cycle. Such an injector would not deliver the required amount of fuel and the cylinder in question would run lean. This test is ideal for identifying an injector with an unacceptably slow solenoid reaction time. It is not however possible to calculate the time taken for spring of the injector to fully close the injector and cut off the fuel flow. With this level off it can be seen that the amount of time that the injector is held open is not necessarily the same as the time measured. At this point the current can be seen to level off before rising again as the pintle is held open. The first part of the waveform is responsible for the electromagnetic force lifting the pintle, in this example taking approximately 0.6 ms. The waveform is (split) into two clearly defined areas. This delay is important to monitor and can sometimes occupy a third of the total pulse width. ![]() This time is called the (solenoid reaction time). An electromechanical injector of course takes a short time to react, as it requires a level of magnetism to build before the pintle is lifted off its seat. An independent injection system (in which fuel is injected once into each cylinder for each two revolution of the crankshaft) is used. ![]() As a very rough guide the injector pulse widths for an engine at normal operating temperature at idle speed are around 2.5 ms for simultaneous and 3.5 ms for sequential. SFI Sequential Multiport Fuel Injection System Last Updated on Thu, Toyota RAV4 Car Features An L-type SFI system directly detects the intake air mass with a hot wire type mass air flow meter. A sequential system receives just 1 injection pulse per cycle, timed to coincide with the opening of the inlet valve. A simultaneous system fires all 4 injectors at the same time with each cylinder receiving 2 injection pulses per cycle (720° crankshaft rotation). In multi-point injection may be either sequential or simultaneous.
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