[Gmecm] Hmm, interesting...

[kris schneider]

Ok so I'm getting better at tuning some basic things on my '72 
Cheyenne/350/454 TBI/350 injectors with a 7747 & moates G2.

Anyway, I started out with an ASKM broadcast code chip, which is for a 
4.3L/auto vehicle, which made the truck run at least better than the couple 
of 350 broadcast code chips I had lying around when I first did the swap and 
didn't have any programming tools.

So I did a few changes on my 2nd to last chip, including upping some 
sections of the adder VE table and disabling EGR and changing the IAC park 
position on the advice of another member of this mailing list.  With this 
chip the truck idled reasonably well at a stable RPM and was at least better 
accelerating cold than it was before with the unmodified ASKM chip.

So on my last chip, I dropped the ALDL/Closed loop spark from 8.086 to 000, 
and realized that the cylinder select was still at "6" and not "8".

When I tried running this chip cold, the idle was way worse than before, and 
seemed to be "hunting" between about 500 and 1100 RPM, and would eventually 
die out after hunting kept dropping the RPM's lower and lower.  As I 
understand it the ALDL/closed loop spark variable is only brought into play 
when a scanner is hooked up or pins A&B are bridged (which wasn't the case) 
so changing the cylinder select from 6 to 8 is exclusively responsible for 
this "hunting".

The only thing I can think of is that this modified the injector firing 
ratio in async firing mode, but my curiousity is how I can correct this so 
that I can have the cylinder select at 8 and keep my idle at least 
relatively normal.  Any ideas?

Kris Schneider
www.speedyoldtruck.com