[Gmecm] Re: Big cap HEI on 7747

[Andrew Gibson]

I wasn't talking about the 4 wires from the module to the ecm. I was talking about the two wires from the ignition pickup coil inside the distributor to the module. If the wires are switched the timing pickup is coming off the curved section of the waveform instead of the vertical slope in the center. This can offset the timing by as much as 40 degress and will vary greatly by engine rpm. (See the piggyback igintion module discussion I started a couple of months ago.) The wires should be white and green (at least off the pickup coil) I don't remember which is positive and which is negative.
   
  Also since you are obviously having problems and must have extended the pickup coil wires to have a external module: If you need the module more than 1.5" away (The length of  stock pickup coil wires) the spliced in wires need to be twisted for noise reduction. (If you peel the insulation off a piece of network cable you will get the idea)
   
  Good luck!

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