Got a 1991 Syclone in the shop and it has an Accel ECU with CALMAP. Problem is, I can't access the ECU. I have the cable, and version 6.32 of the software, but keep getting a "Echo Mismatch" error. This is supposedly a comm error between the ECU and laptop, but the literature does not state how to fix it or work around it. Darn Accel DFI hotline won't return my calls either

 

we have the gen 6 program on our corvette but we havent had any problem like that

 

try changing the ports speed.

 

Don't use windoze. Echo mismatch means you are using some kind of windows software on your laptop. You must boot the computer in DOS to use the old ACCEL software.

 

why didnt you get the gen 7