Hopefully, this will help others in their research, and to check if they installed their crank reluctors properly on this engine family.
This is from a 2007 rwd silverado 6.0L LY6 engine with displacement on demand feature (kills cyls 1,4,6,7 on the highway).
This engine has the 58T reluctor and not the 24x reluctor.
Interesting thing I found out....the #1 TDC moment occurs at exactly the same time as the gm 3.9L v6 engine (the one that jumps time alot).
There is a bulletin on the 3.9L slipping its reluctor out of time, probably after an overheat condition.
so....here we go.
I count the first tooth after the 2-tooth gap as 1.
The width of each tooth is 3 degrees. Top or bottom is the same in the pictures. The large gap is 12 deg. wide. (2 missing teeth, including valleys)
When I describe a tooth edge, I will say H2L for logic High going to Low, and L2H for logic Low going to High.
500ms-cursors.jpg
In the following waveforms: 1/yellow= cyl #1 compression, 2/green= #1 injector, 3/blue= cam signal, 4/red= crankshaft signal.
#1 TDC occurs @ 14T (H2L) edge.
End Of Injector Time occurs (in double-fire mode) @ center of tooth gap and 43T (H2L) edge.
The computer detected the misfire I created with my setup, and put itself into double-fire mode. Sorry, couldn't be avoided.
s-l300.jpg
This is the cam reluctor/gear used in this engine. I just am not sure if a raised portion is logic HIGH or LOW. My guess is HIGH = raised.
Here are the higher resolution shots for all those tooth-counters out there. Events are edge clocked, per typical design.
50ms-1.jpg 50ms-2.jpg 50ms-3.jpg 50ms-4.jpg All taken @50ms sweep time.
These are my other shots I took.
200ms.jpg @200ms
100ms.jpg @100ms
I may edit this later to provide details on the 4X cam signal, but it is very late, and I am tired. Took forever to get ahead of my workload in order to snag these shots before the customer picked it up. Hopefully this information is useful, since no one has ever posted this data on the web, yet.
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