Fuel injectors make a sharp clicking sound, when they are functioning properly. In general, fuel injectors are hard wearing and with a little care, can often last; the life of the engine. Fuel injectors are considered to be dirty when the hydrocarbons and additives which all forms part of today’s fuels, together with engine gunk and carbon, cause the injectors to become restricted. A 10% restriction in the fuel flow of a single fuel injector can be enough to cause a lean misfire. I could try leaving them in the sonic cleaner for a day. An injector that is stuck closed will give you a reading of 200 to 250F, and one that is stuck open will cause the temperature to rise up to 600F or more. Our technicians tell us that this problem can be caused by some fuel additives.There are special procedures which may be able to restore the affected injector. The Injector is hooked to the 12 volt line.. the ECU is the device that will pull the Injector Coil to ground opening it .. Describe what procedure you are using to test the 'Ground'.. Cap The injector requires power to open it.. the lack of a ground will cause it to close.. New Fuel pump relay 4. Exhaust Aftertreatment Fuel Injector A Stuck Closed. If grit or contaminated fuel gets past the main fuel filter it can plug the small mesh filter in the top of the injector. How To Prevent Fuel Injector Problems. Sometimes Injectors Get “Stuck” Closed After Sitting Around Too Long: Use a small 9 volt battery to check for stuck injectors before installing them in an engine. Fuel Injection System Fuel Injection History. That's the same reading I get from good injectors. There is also another way fuel injectors can become clogged. Both read about 2.6 ohms, ironic I know. 1. The other was on my carwhen it descided to stick open and stall out the engine. Fuel injector flow rates, atomization and distribution are affected and this can cause all sorts of drive-ability and performance problems. Used fuel injector wire connecters 6. One or more fuel injectors may become stuck closed causing an engine misfire and the check engine light to illuminate. Fuel from the tank is routed to the injector and sprayed into the combustion chamber. Meaning, that sooner or later the fuel injectors on your fuel injection engine will get dirty and will get clogged to some extent. Fuel Injector Sound – By using an engine stethoscope, you can listen to your car’s engine. Used fuel injectors (from junkyard may not be in working condition) 7. So, the absence of this sound can indicate, a problem with an injector. It arrives via a nozzle that is opened and closed with a needle valve.The opening and closing of the valve is operated by a solenoid. Just listen for a click. New Fuel pump 2. I would have to open up my cleaner and hotwire it though. New Fuel filter 3. Older cars used to supply the engine with fuel using carburetors which are a mechanical device that used to mix air and fuel, and because of the mechanical injection systems have a low adjustment that suits the different working conditions of the engines such as various temperatures, working loads altitude, and ignition timing. When the needle valve is opened, fuel under enormous pressure is sprayed into the combustion chamber. If the injector is open all the time, then it's toast.. This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). What does that mean? In modern common rail diesel engines, fuel pressures can be over 25,000 psi. The one that's stuck closed was a little rusty at the tip. New Fuel pressure regulator 5.