MPI, GDI, and SPI all this are injectors’ profiles, SPI (single point injection) this is the earliest setting that has a single injector on the throttle body regardless of how many cylinders in the engine there is always one port for fuel feeding this setting used in the transition period from using carburetors to using EFI systems also they have many drawbacks such as uneven shape and bad distribution of fuel to cylinders MPI (Multipoint Injection). You can learn more How Fuel Injection Systems Work Electronic Fuel injection system variation PWM (Pulse Width Modulation) technique, so when the injector gets a signal from the control unit to open an electromagnet moves a plunger allowing the pressurized fuel coming out in a picture of very fine droplets, and this happens when the fuel passes through a very highly engineered nozzle that atomizes the fuel to make it easy to burn, the amount of the fuel determined by the amount of time the nozzle is opened (Pulse Width). The injector in a basic picture is an electronically controlled valve that is supplied with pressurized fuel from the fuel pump at a certain pressure level injector can be electromagnetically opened and closed at very high speed-this speed is controlled by the electronic control unit using.
We have a focus on the Spark Ignition engine (SI Engine), which is run by Octane or Petrol. We have seen two types of fuel systems, fuel injection systems in diesel engines and petrol or octane run the engine. The idea of electronic fuel injection systems was developed to solve the old mechanical injection systems problems so relying on the reading of a different sensor feed into a control unit analyze this data and give back the exact amount of fuel needed to meet better engine performance and at the same time best fuel consumption, these modern EFI systems usually consist of some basic components such as fuel pump, fuel rail, fuel injector. Older cars used to supply the engine with fuel using carburetors which are mechanical devices that are used to mix air and fuel, and because the mechanical injection systems have a low adjustment that suits the different working conditions of the engines such as various temperatures, working loads altitude, and ignition timing. So let’s start Fuel Injection System Fuel Injection History It’s important to learn some basics about the fuel injector to understand better today’s topic is what causes no injector pulse. Can’t the vehicle start? Having poor idle stability? Bad performance and increased fuel consumption?Īll engines need three things to start and work properly spark, fuel and compression if one of these three factors have a defect then you’ll never have smooth running for your engine, so if you have your engine unable to start you have to check some points such as security system, fuel level, spark plugs status, cylinder compression is good enough to compress the fuel, crankshaft angle and finally injector pulse, so let’s assume that all the above checklist is in a very good state except having an injector pulse so in this guide I’m going to show you what it means by injector how they work and what causes no injector pulse.
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