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I have a 1992 gmc 1500 4.3l it appears to be dumping to much fuel and will not start unless i unhook one injector?
Mardaw1
probable fuel pressure regulator
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∙ 15y ago
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hi I have a 1986 chev celebrity also, fuel injector does not get signal to pulse the injector so it wont run unless fuel is being pured down the throttle body, ideas??
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Unless you have the calibration equipment, I do not understand why you would want to "Open" an injector. The injector has a threaded section which unscrews to reveal the inner workings, these inner workings consist of the needle, the spring and the shim(s). Tampering with the insides of an injector can be very costly, they are metered to deliver an exact amount of fuel (hence the shims), unless you have the calibration equipment to reset them and re shim them, then they are best left alone. A set of injectors can be checked by an approved agent quite cheapley and can be overhauled by them for naything up to 20 - 30/injector. However, if you must strip the injectors, you will need to hold the body in a vice whilst you turn the other half with a spanner around the "Flats"
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How do you remove and test diesel fuel injectors?
Removing the injector is fairly simple. There is a fuel supply line (steel line) to each injector. There is also a return line (smaller one). Both of these lines will have to be removed. On the return line be careful not to lose the little compression washers. Remove the two bolts that hold the injector in place. The injector should pull out. Be careful not to lose the copper washer that usually comes out with it. Inspect the end of it. There should be tiny holes in the end where the fuel sprays out. Unless you have a injector tester you will have to take them to a Diesel mechanic and have them tested. They will hook them up to a machine that can apply the PSI required to see if they are working properly. It shouldn't cost that much.
What is wrong with a 1993 Z71 if it won't start unless only one injector is hooked up?
my best gess is that your injectors are sending too much fuel into the cylinder for the sparkplug to ignite
