How to test injectors? I think I may have one sticking open.
08-14-2003, 06:44 PM
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How to test injectors? I think I may have one sticking open.
I think my fuel problem has to be the refurbished injectors I put on. They're from a 93 LT1, and were cleaned and put new orings on before I bought em, but that seems to be the only thing I changed out last weekend that could be causing my problems. Unless the ECM or MAF is bad, but those worked before I tore into the car.
The fuel pressure holds after shutdown, so I doubt the injectors are leaking.
I know I can test the ohms across each injector to verify that the coil is ok, but is there a way to test flow? I was thinking that I could test flow, by moving the a/c outta the way enough to allow space to lift the fuel rail and place some little jars underneath each injector, then crank the car over.
The one thing that worries me is turning the car over without the intake runners on it. Will I even get a good test, or will having the intake removed somehow affect the engine during cranking? As long as nothing gets sucked into the intake base manifold, this test should work right?
The fuel pressure holds after shutdown, so I doubt the injectors are leaking.
I know I can test the ohms across each injector to verify that the coil is ok, but is there a way to test flow? I was thinking that I could test flow, by moving the a/c outta the way enough to allow space to lift the fuel rail and place some little jars underneath each injector, then crank the car over.
The one thing that worries me is turning the car over without the intake runners on it. Will I even get a good test, or will having the intake removed somehow affect the engine during cranking? As long as nothing gets sucked into the intake base manifold, this test should work right?
08-14-2003, 07:20 PM
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Re: How to test injectors? I think I may have one sticking open. (CentralCoaster)
TTT. How about if I run the car, and unplug different injectors one at a time? Anybody tried this?
08-14-2003, 10:19 PM
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Re: How to test injectors? I think I may have one sticking open. (CentralCoaster)
If an injector is sticking open, the pressure wouldn't hold.
Unplugging them one at a time while it's running probably wouldn't tell you much, since l98's are batch fire. Each bank of injectors fire simultaneously when pulsed.
Unplugging them one at a time while it's running probably wouldn't tell you much, since l98's are batch fire. Each bank of injectors fire simultaneously when pulsed.
08-15-2003, 12:18 AM
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Re: How to test injectors? I think I may have one sticking open. (CentralCoaster)
If you suspect a dynamic problem with an injector put you finger on the back of each at idle and you should feel a diffence with a sticking injector.
It might be a good idea to send the set to Rich at Cruzin Performance (link on my site). He reconditions/tests a set for around $80 with 48hr shop time.
It might be a good idea to send the set to Rich at Cruzin Performance (link on my site). He reconditions/tests a set for around $80 with 48hr shop time.
08-15-2003, 06:12 AM
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Re: How to test injectors? I think I may have one sticking open. (65Z01)
How about pulling the injector fuse(s) and then attempting to start the car. If you get firing, then one or more of the injectors is leaking. My 85 has 2 injector fuses. located in the fuse panel at the right side of the dash. Quick and easy, worked for me.
08-17-2003, 12:43 AM
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Re: How to test injectors? I think I may have one sticking open. (CentralCoaster)
I have an ASNU Injector Cleaner and Flow Analyzer setup and will test and flow your set for $40 + shipping. I will provide test data and next day service.
I can also provide cleaning and parts if needed at an extra cost.
Call or email me for details.
Gordon Irwin 206-919-0794
Gordon@witchhunter.com
P.S. My Injector servicing web site will be up in 2 weeks.
I can also provide cleaning and parts if needed at an extra cost.
Call or email me for details.
Gordon Irwin 206-919-0794
Gordon@witchhunter.com
P.S. My Injector servicing web site will be up in 2 weeks.
