LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How to test fuel injectors?

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Old 06-05-2005, 09:45 AM
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How to test fuel injectors?

I suspect one of my injectors or more is bad. How do i test them to make sure nothing is wrong with them?
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Old 06-05-2005, 10:24 AM
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Re: How to test fuel injectors?

Well, if you suspect one of leaking, simply unbolt the fuel rails and lift up to where you can see the bottoms of the injectors while leaving them directly over the ports. Then pressurize the fuel system. You'll know if you've got a leaker then.

If you suspect one of not working, you can try holding a long screwdriver to the injector while the motor is running and holding your ear to it (or use a long length of rubber tubing attached to the end) and listen for a systematic ticking coming from each injector.
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Old 06-05-2005, 10:28 AM
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Re: How to test fuel injectors?

take a screw driver and hold it against the ingector and put your ear on the other end of the screw driver and listen to see if it sounds different from the rest.
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Old 06-05-2005, 04:18 PM
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Re: How to test fuel injectors?

To pressurize it, should i just have the starter turn the motor over? I think il try this. Anything else i should look for while the rails are off?
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Old 06-05-2005, 05:03 PM
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Re: How to test fuel injectors?

Originally Posted by pHEnomIC
To pressurize it, should i just have the starter turn the motor over? I think il try this. Anything else i should look for while the rails are off?
to pressurize it wouldnt you just turn the key to the on position without starting it ???
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Old 06-05-2005, 05:23 PM
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Re: How to test fuel injectors?

To pressurize the system simple turn the key to 'KEY ON IGNITION OFF" I.E. DON'T start the car. You should hear the pump prime.
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