Re: Timing Jump on 165/TPI System

["Bruce Plecan" <nacelp@bright.net>]

As the pickup in the dissy is an A/C generator the faster it spins the
greater and earlier the signal, hence the timing advances.
  Why, for drivability, when there is a ecm/wiring/module problem.
Grumpy


| 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