Fw: 128K vs 256K Proms in one ecm

[Bruce Plecan]

Please ignore the 1250 idle comment
Bruce


-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: DIY_EFI <DIY_EFI at efi332.eng.ohio-state.edu>
Date: Thursday, January 07, 1999 4:13 PM
Subject: 128K vs 256K Proms in one ecm


>Could some one splan to me why if the 739+749 use the same
>PCB, why the 730 will not see a 128K prom, and a 749 sees 
>either. 
>730 using AUJP  749 using syclone campaign chip 
>  On a 730 (92 Camaro), there is a 4th gear switch, that the ecm
>"uses", anyone know for what?,  timing, fuel, TCC all seem the same
>wiether it's on or off.
>  There is a difference in TCC pinouts from 749 to 730.
>The 730 basically leaves the EGR on all the time and flickers it once
>in a while to test, it.  749 seems to not even flicker it, strange.
>
>On the syclone idle if it's below 550 the IAC retracts, that's fine,
>but as it exceeds 575 goin to a desired 600 the 600 jumps to 1250
>anyone played with this??  Seems like would be lousy idling.
>Bruce
>