What gives power to the fuel injectors?

What gives power to the fuel injectors?

It is supplied with pressurized fuel by the fuel pump in your car, and it is capable of opening and closing many times per second. When the injector is energized, an electromagnet moves a plunger that opens the valve, allowing the pressurized fuel to squirt out through a tiny nozzle.

Why have I got a fuel pressure but no start?

If the fuel pump is running and delivering normal pressure to the engine, and the engine has spark and compression, but will not start, the fuel injectors are probably not opening. The PCM uses the trigger signal from the crankshaft position sensor, and/or camshaft position sensor to pulse the injectors.

How do I know if my injector has power?

Unplug the electrical connector from the fuel injector you want to test. Turn the ignition switch to the ON position. Touch the terminals (one at a time) of the harness connector with the test light. One of the terminals should make the test light glow, this is the injector power source coming from the computer.

What tells the injectors to fire?

Electronic Control Unit (ECU) The ECU is the brain of the operation. It uses engine RPM and signals from different sensors to meter the fuel. It does this by telling the fuel injectors when and how long to fire. The ECU often controls other functions like the fuel pump and ignition timing.

What can cause fuel injectors not to spray?

If it does not spray, the problem is the injector or no fuel pressure. The injector should have around 1.3 ohms of resistance, if it is open or zero resistance, it is bad. The injector could be totally clogged as well.

What can cause injectors not to open?

If either power side or the ground side has an interruption in the circuit the injector will fail to open. The injectors internal components can fail and not open. The injector could get clogged internally and fail to open.