lgoodson@pacbell.net Posted March 13, 2009 Share Posted March 13, 2009 I have this LT1 (93) and in preparation for starting it I checked the injectors to see if any of them were not working. Well they all are not working. The engine has not run for about 3 years so I expected that I might have one not working but not all eight. To test them I appied 12 volts to one terminal on the injectors and the negative lead from the battery on the other terminal and there was no sound, no clicking, nothing. Does this sound right or am I testing these the wrong way. I thought that I might just try applying 24 volts tomorrow to see if I can break them loose. If not I will be needing new ones. Any body have some? 24lb Larry Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted March 13, 2009 Share Posted March 13, 2009 the injectors will not function without about 40 psi of fuel pressure, the cpu won,t supply the pulse without seeing 5 psi of oil pressure, and having the fuel rails pressurized is mandatory this might help http://forum.grumpysperformance.com/viewtopic.php?f=55&t=1241&p=3037#p3037 Quote Link to comment Share on other sites More sharing options...
lgoodson@pacbell.net Posted March 13, 2009 Author Share Posted March 13, 2009 Grumpyvette. I was trying to check for stuck injectors by applying 12 volts. This worked on my 280Z injectors. They would click when the 12V was applied. I had one that was stuck but the 12V cleared it up. Shouldn't these GM injectors work the same. There is no computer involved, The injectors are unplugged. Just applying the 12V. The solenoid should work I would think. Larry Quote Link to comment Share on other sites More sharing options...
Trevor Posted March 13, 2009 Share Posted March 13, 2009 http://www.ecs.fullerton.edu/~sowell/jag/fuelingsys/testrig/InjectorTestRig.pdf Quote Link to comment Share on other sites More sharing options...
jack46 Posted March 14, 2009 Share Posted March 14, 2009 I would NOT apply 24 volts. I sold a set for a 93 LT1 and the guy buying them checked the injectors with 12 volts and they clicked when power was applied. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted March 14, 2009 Share Posted March 14, 2009 http://www.ecs.fullerton.edu/~sowell/jag/fuelingsys/testrig/InjectorTestRig.pdf Nice link Quote Link to comment Share on other sites More sharing options...
lgoodson@pacbell.net Posted March 14, 2009 Author Share Posted March 14, 2009 I decided against the 24V test. I also discovered that if I put my ear real close the the injectors I can hear them clicking. I was use to the sound that my 280Z injectors made years ago when I tested them. Used a listening device ( long screw drive) and could hear all of them working. Some better than others. A little tapping and they started working better. Quote Link to comment Share on other sites More sharing options...
jack46 Posted March 14, 2009 Share Posted March 14, 2009 I like how Seafoam works I have had excellent results with that product in a few engines I run it one can per ~5 gallons. Glad you found they are activating. Good luck Quote Link to comment Share on other sites More sharing options...
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