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A leaking fuel injector can cause an array of problems for your gmc sierra Read on to learn how to check for leaking fuel injectors to ensure your engine runs optimally and prevent fire outbreaks from external injector leaks and vacuum leaks. When the injector doesn’t close properly, excess fuel may enter the combustion chamber, creating a strong fuel odor and potentially wasting fuel.
How to Check For Leaking Fuel Injector and Fixes | Rx Mechanic
If its a clogged or dirty fuel injector the problem will be there all the time while driving or start up ect You may see the glowplug saturated when you remove it. Sounds like you have a bad fuel pump regulator if you dont have a regulator it might be the fuel pump that is going out
It also sounds like a intake manifold gasket might be leaking
Have you done a full tune up already I'll start with that first Testing a leaking ‘spider’ fuel injector assembly or a leaking fuel pressure regulator (gm 4.3l, 5.0l, or 5.7l ) can seem impossible, since both of these bad boys are located inside the intake manifold's plenum but they can be tested and it's far easier than you think. The resistance of the fuel injector coil windings will increase as the temperature of the fuel injector increases
In this video i demonstrate how to check and test for bad fuel injectors I show how to conduct a power balance test, test with a noid light and test with a multimeter. This allows the truck to crank over without injecting fuel to start The injectors that are stuck open will still allow fuel to enter the cylinder
This fuel will spray out the glowplug hole
All this test will do is show you which injectors may be sticking
