Timing Jump on 165/TPI System

[Mark Romans]

I just rechecked and 700 rpm's for both GDF files, stall1 and stall2.  I
wonder if that has something to do with stall saver rpm's?
Next question, what specifically does stall saver do?
Mark
-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Sunday, January 09, 2000 5:32 PM
Subject: Re: Timing Jump on 165/TPI System


>
>
>| Hey Bruce: If I disconnect my est connector, should I see the advance at
>| 2500 rpm?
>
>Yes
>
>| I am wondering if this is why I have the idle problem.  Remember how the
>| signal goes to zero advance?
>
>As I recall it did that during the stall and it was right at 400 rpm, which
>is when the ecm drops out of bypass, and it would read 0 as I understand
>things.
>
>The only failure I've personnally had or diagnosed with a gm module is hot
>stalling, and progressing to where the engine needs to cool before it would
>restart.
>
>BTW, is yours a large or small cap Dissy
>Bruce
>
>| Mark
>| -----Original Message-----
>| From: John T. Martin <gmman at eskimo.com>
>| To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
>| Date: Sunday, January 09, 2000 10:33 AM
>| Subject: Re: Timing Jump on 165/TPI System
>|
>|
>| >My  $.02
>| >
>| >That is a normal condition, also a test for P/U coil signal strength.
The
>| >advance is triggered by the P/U coil signal amplitude, not RPM. It is a
>| back
>| >up as I understand it, but a good test if you suspect a weak magnet in
>the
>| >dist. We had a run of K engines with shaft problems a while back and in
>| >bypass (est disconnected), 2500 rpm the advance was not triggered. Also
>the
>| >weak pick-up signal affects idle quality.
>| >-----Original Message-----
>| >From: Craig Moates <craig.moates at home.com>
>| >To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
>| >Date: Saturday, January 08, 2000 9:08 PM
>| >Subject: Timing Jump on 165/TPI System
>| >
>| >
>| >Folks,
>| >
>| >A question:
>| >
>| >With timing control connector disconnected (ie. setting timing on a
>| >165-based TPI motor), timing should sit still, which it does for me at
>low
>| >RPM. However, when I idle it on up to say 2000 or 2500, it seems to
>advance
>| >like 12 degrees or so, instantaneously, and hold up there until I idle
it
>| >back down. Then it jump-returns to the previous value. This is all
>| >timing-light based. Any thoughts on what is being seen? There's about a
>1-3
>| >degree drift on idle-up, probably from timing chain stretch, but that's
>not
>| >huge.
>| >
>| >Anyways, fishing for thoughts. It's not problematic, just would like to
>| >understand what's happening and why.
>| >
>| >Sincerely,
>| >Craig
>| >
>| >
>| >
>|
>