The fuel from the tank is pumped through a fuel filter to the fuel Of collection and distribution pipe for the fuel.
The injectors are connected to the fuel rail. The intake manifold, and inject the fuel in the direction of the intake The injector is mounted in the throttle body and injects Method where the fuel/air mixture is achieved by one centrally placed ByĪdding the fuel to the air sucked in by the engine, a mixture is createdĭepending on the kind of engine management system either one injector per cylinder (multipoint systems) or one injector for all cylinders (singlepoint systems) are used.
You can have your GDI injectors properly tested at Injector-Rehab HERE.Valves which accurately control the quantity of fuel delivered. THIS IS FALSE. If you were in the injector business and couldn’t test under actual operating conditions, would you come up with a believable “Excuse” (We will call it), or would you just miss out on all that business? Unfortunately many many places decide to tell their customers this “Excuse”. Because they can’t, they claim they can see the spray pattern better at low pressures and at static flow. Many times not until they are under heat.Ĭompanies using a standard port injection machine 100% absolutely CAN NOT do this. GDI Fuel injectors don’t fail unless they are in conditions replicating their operating conditions. We apply a “stress test” to get the fuel injector ready for testing. By running an injector in it’s actual conditions is the ONLY way to properly test the condition of the injector. Testing a GDI Fuel Injector PROPERLY is no easy mater due to the fact that their operating conditions of of current voltage and pressure are ALWAYS changing. If available, it is deployed when the fuel injector opening reaches the higher values, or above 3.5 milli seconds. If they do, it is there to further protect it from heat damage. Not all GDI systems have this second hold stage. Three is the second stage in the hold current which is set at about 2.5 Amps. This allows the fuel injector to stay open to the exact same aperture as before or during the 12 Amp current spike, but with less heat. Once it is open, in order to protect the internal coil, the current is reduced down by internal ECM resistor to about 5 Amps. Being that GDI pressures are A LOT higher, you need a lot more current to open, hence the high 12 Amp value. The idea behind Peak-and-Hold is to supply a high current to quickly activate or open the fuel injector needle. Two is the first stage of the hold current. Standard PFI has an injector lag time of around. You also need to remember that a GDI open event is much faster than a standard port injection at about 0.04 to 5 milli seconds. The turn on current value will change according to demand. This all depends on fuel demands of the particular engine conditions. This turn-on point can go as high as 12 amps. Each fuel injector’s current waveform has a few points of interest. The analysis of the waveform of the fuel injectors allows us to read how the injector is operating through an oscilloscope. Next, we will explain how GDI Fuel Injectors are triggered and how we test them. GDI internal resistance ranges between 2.6 to 16.3 Ohms, depending on the application. The biggest difference is the voltage and current values employed. Nominal PFI fuel injectors draw about 900 milli Amps where GDI Injectors use a Peak-and-Hold Triggering scheme much like the older Throttle Body Injectors. On a standard PFI system, the pressure remains the same at a steady 35psi – 60psi depending on the system.
By definition, this means the electrical conditions will be varying as well. In other words, the varying pressure at the rails varies on demand. GDI systems have various ways to trigger their fuel injectors and do so at varying pressures. GDI fuel injector testing is a far cry from standard port / PFI fuel injector testing. Fuel Injector Conversion – cc/min to lbs/hr.Troubleshooting and Cleaning Fuel Injectors.Rebuilding a Piezoelectric Fuel Injector.Dynamic Testing and Cleaning Fuel Injectors.Standard Fuel Injector Cleaning and Flow Testing.Fuel Injector Cleaning and Flow Testing Service.