[Gmecm] Re: Big cap HEI on 7747

[Mark Romans]

Thanks Andrew, I'll check it!
Mark

----- Original Message ----- 
From: "Andrew Gibson" <andrewsharyn at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Saturday, June 03, 2006 5:09 PM
Subject: [Gmecm] Re: Big cap HEI on 7747


>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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