The fuel pump, pumps the fuel through the feed line which goes through the fuel filter which then
goes to the fuel rail, which the injectors are connected to. The fuel pressure is controlled by fuel pressure
regulator. So when you drive the car at high revs there isn't enough vacuum in the manifold to open the valves which allows the fuel in the return line.
Procedure for experiment
Resistance test. Remove the harness connector from every injector. Using an ohmmeter we tested the resistance by using the injector terminals.
Checking injectors electrical signal by using noid light, and if the light goes brighter when you rev the car, then its good.
Checking injector operation by engine speed while the engine is running i disconnected one injector plug at a time and recorded the RPM drop which gave me the Average of 100rpm
Checking injector winding resistance With the engine turned off by using the ohm meter and checked the resistance of each injector winding, and the results was average of 14.5 ohms.
Reflection on experiment
The overall results that I got was good because the noid light showed that the injectors had low resistance
when the car was reved up.
When Checking the winding resistance the Normal spec reading should be around 16ohms according to the video below :)
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