That's a very confusing couple of statements.@jonheld 12 volts at each injector plug, with one pin at zero -once all three per bank are disconnected. No change in grounding/continuity to ground of the zero volt pin when cranking. 12 pin shows volts while cranking at 11.something.
What should I see on that other pin when the injectors fire, and is a ground against the head correct to detect it?
Sorry for the confusion and my wording, I'll clarify.Also, keep in mind that when measuring voltage on the injector connectors with the injectors in circuit, I would expect to see +12 on both pins as you're measuring across a coil. The ECU will ground 1 side (pin 1) for a brief moment to fire each bank. Again, the ECU pulses (logic low) the banks of injectors to fire them.
I would use an oscilloscope in order to see the pulses. A DMM will not react quickly enough.So I misunderstood you, then: It's not a true grounding, but a logic low.
The question remains of how to detect this. I'll Google it, and inspect accordingly.
Thanks, that's what I'm finding.I would use an oscilloscope in order to see the pulses. A DMM will not react quickly enough.
That's easy for me because I have one
You should be able to hear an injector if you place a hose to your ear and the other end on the injector or fuel rail while cranking. I have never tried this, but it sounds reasonable to me.
I think these are the guys that come recommended by the forum. Not very expensive and quick turn around.It's confirmed, they are only actuating faintly.
I've got them in the ultrasonic again, maybe they'll loosen up with the heat and detergent.
New pintle caps and basket filters are a week out, so I've got time to see if they'll perform again.
Thanks again for all the diagnostic help, Jon. I'll call them and a few others right now.
Haha, it runs! There's a little mechanic shop in SLC that does injectors.Well that certainly looks promising.