What does an injector solenoid do?
In short, injectors are solenoid operated valves that use Pulse Width Modulated (PWM) signals from the Engine Control Unit to open or close a valve that permits or blocks fuel flow to the engine. A well designed fuel injector ensures quick and complete combustion of fuel.
What causes fuel injectors to fail?
Fuel injectors will fail when debris (water, dirt particles, etc.) or rust find their way into the system and, after time, plug up the nozzle, the armature, or the nozzle needle gets stuck. You should also consider fuel additives designed for stabilizing the fuel in your system.
How solenoid is used for the fuel injector?
Electromagnetic – or solenoid – injectors have a traditional coil, like you would see for a gas injector. The voltage that’s applied to the coil pulls the solenoid valve up. As it does, it allows the check ball to move up with it. Below the check ball is the inlet in the side of the injector for the high pressure fuel.
What happens when one of the solenoids fails to work?
When one of the solenoids fails to operate, the engine ECU will log a fault code. This is evident by the “CEL” check engine light coming on. By scanning the engine ECU to retrieve the fault code, it can be determined what problem was detected by cross referencing the fault code against the engine manufacturer’s chart.
What should the armature be at for a good solenoid?
A good solenoid should pull the armature down with a minimum of 8 volts at ambient temperature (12 VDC). Later model engines have the ability to detect solenoid problems within the engine ECU. When one of the solenoids fails to operate, the engine ECU will log a fault code. This is evident by the “CEL” check engine light coming on.
Why do I need to replace the solenoid on my PacBrake?
After replacing the three external seals, torque the solenoid, if you have oil coming out the bottom, the internal seal is leaking and solenoid replacement is necessary. Solenoid torque is one of the most common reasons for solenoid failures, either the correct tool wasn’t used for removal or it was over-torqued.
What does the ball check valve on a jake brake do?
The injector rocker arm begins its travel as in the normal injection cycle, moving the master piston upward and directing high-pressure oil to the slave piston. The ball check valve in the control valve traps high-pressure oil in the master-slave piston system.