Idle / Ignition system

[doctorDHD@xxxx]

OK, while playing around with the ignition / idle system of 6530 I noted 
something very interesting. As I previous stated, the tachometer makes small 
jumps upward, intermittently. I accidentally touched the wire that goes to the 
negative side of the ignition coil primary circuit (color WS) and noted that I 
was getting intermittent shocks. These shocks were at the same time that the 
tach jumped! When I connected a small neon bulb (i.e., an NE-2 for you 
engineering types), the bulb would blink intermittently along with the jumping of the 
tach. (Hey I got fed up with getting jolted so I substituted the bulb 
instead.) Remember that the engine RPM is NOT jumping only the tach is. I suppose 
the tach is getting these voltage spikes and that is why it is jumping and maybe 
these spikes are affecting the idle ECU controller. The spike occur only at 
low RPM up to about 1400 rpm.

Does anyone have a clue as to what to do next?

Dave & 6530 thank you...


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