pcmhacking.net

In the earlier aldl delco pcms stall saver only kicks in at very low rpm, during a stall event. so it wont make a difference in normal running or idle. I think it adds a lot of spark, maybe fuel too to try and up the torque dramatically and get the engine above stall rpm before it stalls. hence 'stall saver'. I assume the logic is same or similar on these pcms.

Reason I ask was a wandering idle in my bastardized 12587603 tune for the CB450 with most of the sensors gone. The one that shouldn't be speed density based on descriptions, but behaved like it was. Most idle stuff was gone/zeroed out, no IAC, no spark correction... as far as I know anyway.