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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