Driving it off the cliff

[ike84]

Originally Posted by Stl-986

Well, you can still owe me a beer, but I'll settle for doing a burbon run with you some time.

Pico is just an oscilloscope. But you do mention something that is worth thinking about. Instead of doing a pico scope I could just hook up my voltmeter.

Here is the question I have though. Coil has 3 wires going to it. ground, a voltage (not sure what voltage) and another wire. In coil ones case it is brown, black, green/black. Brown is obviously ground. But should the black wire have? voltage, ground, ?. What should the green/black wire have? The green/black wire is what comes from the dme. Dont know where the black wire really goes other then it's used by a lot of things. Injectors, all the coils, 02 sensors.

Who is our resident wiring diagram expert?

Not discounting this being a wiring issue. 2 common things with this issue for wiring. DME & bank 1 coils all use the same ground point. GP12.

The black wire goes back to vs 42, which is a connection point for power supply. My best guess is that it is the source of constantly supplied power to the coils (and radio, interestingly) and that the signal from the dme opens the circuit to allow voltage from that supply to activate the coil. So, it should be 12v steady on the black, where as the dme signal wore should be an intermittent (probably 5v) signal.

Dude, I LOVE whisky. Burboun is great, I'm more into ryes as I've gotten older though. There have been few moments in my life where I truly believed in god, and those have been (in no particular order) the birth of my children, the 3 miracles that happened on my wedding day, and the first time I ever tasted Thomas h handy rye whiskey.

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[blue62]

With the "PICO" you should be able to test the entire circuit on a cylinder including DME and sparkplug spark. For function, shorts, resistance, what ever.
With a two channel you could compare Cylinder 1 to another cylinder or CPS signal.
Or the cam signal. Or any other electrical signal.

The "PICO" website has tutorials on running tests on various systems.
It has a good tutorial on Coil on ignition systems including the three wire coil.
It explains function of each of the three wires.
I read the info and from it I learned that the area you have circled in blue in post #126 is (VS 42) is a constant Voltage Supply point.
The tutorial also includes known good waveforms and how to read them.

You could also go to youtube and look for "Scanner Danner" he has many videos on using an Oscilloscope.

PICO is a great diagnostic tool I wish I had one.
But the caveat is: If one doesn't know how to use it then it is of no value

After attempting to help with your issue and following everything you have tried.
It looks like most of the problem is with cylinder 1.
Although I know zero about waveforms or "PICO" it does seem that the issue with cylinder 1 is electrical.