747 Timing Connector and misc questions
Shannen Durphey
shannen at mcn.net
Fri Jun 19 12:41:49 GMT 1998
Jason Weir wrote:
>
> I was under the assumption that disconnecting the timing connector
> on the GM TBI, took the timing control away from the computer so you
> could set the initial timing without the computer getting involved. I
> am trying to change the timing curve in the chip so to start with I
> graphed the existing curve. I got two similar graphs with and without
> the connector connected? I put the graph up on my webpage. By the way I
>
> have set the timing at 12 degrees initial advance at the distributor and
>
> the distributor has no vacuum or centrifugal advance.
>
> http://home.att.net/~jweir/graph.html
>
> Is the timing connector just for timing at idle and knock control..
> What am I missing..
The module has a built in timing advance in case the EST
fails. Keeps driveability somewhat liveable.
<snip>
>
> --
> Jason Weir - 88 YJ - 258 / Howell TBI 145K and counting
> Fayetteville, North Carolina
> JTW Web pages at http://home.att.net/~jweir
> mailto:jweir at worldnet.att.net
Shannen
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