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Fuel injector leaks in a 2008 gmc sierra commonly cause rough idling, fuel odor near the engine, reduced fuel economy, or misfires 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. 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

In this article i'll show you how. 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. 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.

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 You may see the glowplug saturated when you remove it.

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