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Probably the only test you can do with the injectors still in the engine is have it running and then crack open each hard line, one at a time. When the line leaks enough to stop the injector output you should be able to detect a definite change in engine sound and RPM.
You test each injector one at a time. If you don’t get a change on any one injector it would indicate that injector is not working anyway. Think of it like pulling spark plug wires on a gas engine that is missing. If you pull the wire from the bad plug, it doesn’t change anything.
This test will only tell you if you have a nearly or completely failed injector and won’t tell you anything about actual operating condition of any of them.
For a complete test of pop off pressure, spray pattern or dripping/leaking, you need to remove them and have them tested in a shop equipped to do so. For some people it is easier and/or more cost effective to just replace the injectors with new ones.
With that in mind, you could buy one new injector and put it in the front cylinder, start the engine and see if it runs different then before. If not, then the one you took out is probably OK, move it to the middle cylinder and try again. Then do the same to the back cylinder if the middle one is OK. Hopefully that will find your bad one.
Kind of like finding the bad bulb in the old fashioned screw in type Christmas tree lights. 🙂
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Gentlemen; Thankyou for your responses.
Your responses ended in my junk folder?I knew about the isolation test for individual injectors but wanted confirmation.
My problem turned out to be the filter screen inside my fuel tank. Removed it entirely with Ranch Hand’s glass bowl replacement kit.Before I repost another question…….do any know that the ¥385 injectors can be adjusted for “pop” pressure.?I have a pressure tester I purchased off EBay and would like to test after 1400 hours.
Again, thanks for your responses. -
good move on adding the glass bowl , just keep a eye on it for awhile I am sure there will be some more trash to wash out, it just happens. as for the injectors pop off pressure, I was always told to take to a qualified shop to have adjusted, but I do not see why if you knew the suggested pressure you could not verify that pressure setting with the kit you bought to see if they are set where they should be. keep us in the loop with what you find.
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