Lean trim is what I first thought of on your #5 Carl. Similar except yours didn't have an upward (lean)
burn line curve before the high resistance as in this example.
http://www.members.aol.com/bgoode007/leantrimThe next thing I thought of was high resistance in the plug or the wire (snap at the top) Still not a match
to yours though since your firing line kv was fairly normal.
(These are known conditions of secondary idle and snap I did some time ago for my own satisfaction.)
The bottom idle and snap on these was from a spark outside the cylinder and is really confusing.
You would assume that a spark outside the cylinder would be low resistance and the idle capture on
this one seems to confirm this. The confusing part
of this is the snap outside the cylinder.
Edwin has seen this previously and pointed out that the snap outside the cylinder should not
have shortened the burn line and caused higher resistance than the idle wave. I totally agree with
him. Theory tells you it shouldn’t but for some reason in this case it did.
Carl I know you and believe that what you found (spark outside the combustion chamber) was causing
your waveform high resistance on #5. Theory tells you if it’s a leak to ground it should cause low not high
resistance but for some reason in your case it did. Although maybe what I am calling high
resistance doesn't fit the definition. Maybe I should say varying resitance?
Quote: waveforms can be a little tricky, yes?
Yes. IMO too many variables means secondary analysis doesn’t always fit the theory