The ECU is the Electronic Control Unit, sometimesreferred to as the Engine Management System (EMS). This is thebrain that controls the engine, telling the injectorshow long to stay open, injecting fuel and telling the coilwhen to send the spark to the plugs to ignite the fuel airmixture..
Likewise, people ask, how are fuel injectors controlled?
The amount of fuel supplied to the engine isdetermined by the amount of time the fuel injector staysopen. This is called the pulse width, and it is controlledby the ECU. The injectors are mounted in the intake manifoldso that they spray fuel directly at the intakevalves.
Similarly, what causes no power to fuel injectors? No power to the fuel injectors can becaused by a few things. If the relays, fuses, and computerall check out then I would move on to looking at the enginemanagement and fuel system. A no start condition canalso be caused by a faulty fuel pump, or anyof the associated components.
Keeping this in view, what are the symptoms of a bad fuel injector?
Fuel injector symptoms for bad, faulty, dirty, clogged, orleaking injectors are :
- Starting issues.
- Poor idle.
- Failed emissions.
- Poor Performance.
- Engine does not reach full RPM.
- Increased fuel consumption.
- Rough engine performance.
- Surging and bucking under various throttle loads.
Does the ECU control the fuel injectors?
A fuel injection ECU works by pulsing orcontrolling the fuel injectors in the engine. Due to the lowpressures in the intake manifold, the fuel and air mixturethen vaporizes. This is where the fuel injection ECU sensorworks. It gives a signal to the ECU to provide the right airand fuel ratio.
Related Question Answers
How do you change a fuel injector?
How to Replace Fuel Injectors - The metal rod over the fuel injectors is the fuel rail.
- Make sure the engine is cold enough to touch.
- Remove plastic engine covers using appropriate socket.
- Use pliers to disconnect the electrical connector on eachinjector.
- Lift the fuel rail off of the intake manifold, bringing theinjectors with it.
How much is a fuel injector?
You should pay somewhere between $250 and $350 to havethe fuel injector replaced. While parts should cost between$140 and $190, labor will run you $120-$160.Can you drive with bad fuel injectors?
If your fuel injectors are on the fritz,you'll definitely notice a difference when driving.Left unchecked, faulty fuel injectors can damage an engineenough to keep the car from running, but there's usually time tointercept and fix the problem. Still, faulty injectors can'tbe overlooked or ignored for long.Can bad fuel injectors cause check engine light?
The fuel injectors can become clogged withdirt and oil, which means the gas isn't getting to theengine properly. If it's faulty, you will probably begetting really bad gas mileage, or you'll notice it's hardfor the car to pick up speed. A faulty sensor will also makethe Check Engine light turn on.How often should you change fuel injectors?
The fuel injectors on your car will typicallylast between 50,000 and 100,000 miles. The length of time that theinjector lasts has a lot to do with the type of gasthat is used in the car and how often the variousfuel filters are changed.Can bad fuel injectors cause smoke?
The commonest cause of white smoke islikely injector pump timing. So, any decrease in thepressure or delay in the fuel delivery to the combustionchamber will result in incomplete combustion, leading towhite smoke. The incorrect timing can becaused by a worn out timing gear or a damaged crankshaftkeyway.What does fuel injector cleaner do?
solvents give a one-tank clean-up of fuelinjectors, intake valves, carburetor, and combustion chambers.It works to dissolve fuel residue and carbon deposits torestore lost power, reduce rough idle and hesitation, restoreoctane requirements, and improve overall drivability.What happens if fuel injectors are dirty?
Troubleshooting can lead you to the fuelinjectors needing to be cleaned, if an engine isexperiencing any of the classic symptoms of dirty injectors,such as lean misfire, rough idle, hesitation and stumbling on lightacceleration, a loss of power, and higher hydrocarbon (HC) andcarbon monoxide (CO) emissions.What controls the fuel injector pulse?
Based on the data gathered by the ECU sensors, it canbasically control the engine's speed, coolant temperature,throttle angle and exhaust oxygen content. A fuel injectionECU works by pulsing or controlling the fuel injectors inthe engine. It gives a signal to the ECU to provide the right airand fuel ratio.What would cause fuel injectors not to work?
Engine Will Not Start-The most likelycause is that the fuel injectors are probablynot opening. The PCM uses the trigger signal from thecrankshaft position sensor, and/or camshaft position sensor topulse the injectors. When you turn on the key theinjectors should receive battery voltage. 
