How does a EUI injector work?
An electronic unit injector system is installed directly into a cylinder head over every combustion chamber. An engine camshaft drives the injector typically through the rocker lever, resulting in an efficient mechanical and hydraulic fuel system that can minimize parasitic losses.
What are the 3 main functions of the EUI fuel supply system?
Fuel is always circulating within the EUI as two of its functions, other than injection for combustion, are injector lubrication and injector cooling.
What is the VOP for EUI fuel system?
The downward movement of the plunger pressurizes the fuel in the plunger cavity and nozzle. When the fuel pressure reaches the Valve Opening Pressure (VOP) of about 18.5 MPa (2,700 psi), the nozzle valve lifts off its seat and injection begins.
How many volts does it take to open a fuel injector?
They should all be around 12 volts. A lower reading means there is excess resistance in the wire somewhere. Hopefully, these tests have allowed you to find the issue with your fuel injectors; but, as mentioned before, it may not be an electrical problem that is causing the injector to malfunction.
How do you check ground injectors?
Part 1 of 2: Testing injector resistance
- Material Needed.
- Step 1: Make sure the key is off.
- Step 2: Remove injector wiring harness.
- Step 3: Set DVOM to measure ohms.
- Step 4: Test resistance with DVOM.
- Step 5: Repeat with all injectors.
- Step 1: Turn the car on.
- Step 2: Set up DVOM to measure DC voltage.
What is the construction of Eui’s electronic unit injectors?
Construction of EUI’s Electronic unit injectors are mechanically pressurized using electronic control of governing, timing and metering functions. A unit injector consists of several basic elements. 1. The spring-loaded plunger and barrel assembly to pressurize fuel inside the injector. 2.
What is an electronic unit injector?
Electronic unit injectors are mechanically pressurized using electronic control of governing, timing and metering functions. A unit injector consists of several basic elements. 1. The spring-loaded plunger and barrel assembly to pressurize fuel inside the injector.
Is there a bench test for Eui injectors?
Bench testing of EUI injectors is not practical in the field. If an injector is suspected defective, performing a cylinder cut-out or contribution test can identify the bad injector.
What is an EUI and how does it work?
Regardless of the type of unit injector, EUI’s share common operating principles. An electrical signal is sent to the unit injector’s solenoid-actuated spill/poppet valve system to deliver the correct quantity fuel at the precise time required to by ECM algorithms and fuel maps.