Fueling & Injection - new injectors sticking?
03-19-2012, 09:27 PM
well not exactly new but they were just flow matched and 2 stay stuck open.
edelbrock vic jr
lo pro elbow
60lb Siemens injectors
anyways i didnt touch any of the injector wiring during the swap but my number 1 and 3 cylinders seem to just dump fuel. car has NOT been uned yet. its on a stock 4.8l tune. i do have hptuners and tried to do a SD tune but for some reason it wont flash it.
any help would be greatly appreciated.
03-20-2012, 07:39 AM
Try a noid lite on those 2 inj plugs. You don't need to have the fuel pump on, just crank w/ the pump fuse pulled.
KOEO, if the lite comes on when you plug the noid in, the grnd side is shorted. If it blinks while cranking, the circuit is working, and the issue is the inj.
How long ago were the injs cleaned? If some time back, and they were left in open air, [or not lubed after cleaning], the flow fluid may have dried out. When you triggered them the first time, they stuck open...
[I've been doing injs for many yrs. I always force lube them prior to shipping.]:nod:
03-20-2012, 10:38 AM
Yeah i need to try and get a hold of a noid lite. When the guy shipped them to me they were lubed up in a plastic bag. They were tested like a month before i got them.
03-20-2012, 09:12 PM
so i just hooked up the noid and those two turn on with ignition. i tried grounding the black wire on INJ 1 and the pnk/blk on INJ2 and they still stayed on.
duh im dumb i need to run a new wire to the pins on the injectors to make sure theyre ground switching in the ECM not just to straight ground.
just looked over this diagram and realized whats up.
03-21-2012, 11:00 AM
You really dont have to have a noid light. If you have a test light you can perform this test using a couple of stick pins at connector. Just be careful not to damage the terminals
03-21-2012, 02:41 PM
i already tsted them with a noid light
03-21-2012, 05:37 PM
Maybe try checking continuity between pins 3 / 36 of the pcm (connector C1 disconnected) and ground. If you have continuity, that means the pcm is grounding those two injectors @ key on (which it should not...test a known good injector pin to confirm)
When you grounded the black and pink/black, they should stay on because you are doing what the PCM is doing. If you disconnect connector C1 from the PCM and the noid light goes out, that should be a quick test to see if the black and pink/black is being shorted to ground. If it goes out, that tells you that the PCM is grounding the two injectors and probably needs replaced.
03-21-2012, 07:15 PM
so i ran 2 new wires from each injector to the pins they go to and they work fine now.
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