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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 Find effective diy methods to test for a leaking fuel injector without a pressure gauge, including visual inspections, checking spark plugs, using an obd2 scanner, and more to diagnose the issue. In this article i'll show you how.

In this video i demonstrate how to check and test for bad fuel injectors I'll start with that first I show how to conduct a power balance test, test with a noid light and test with a multimeter.

A leaking fuel injector can cause an array of problems for your gmc sierra

When the injector doesn't close properly, excess fuel may enter the combustion chamber, creating a strong fuel odor and potentially wasting fuel. 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 You may see the glowplug saturated when you remove it. If its a clogged or dirty fuel injector the problem will be there all the time while driving or start up ect 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

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