kbracing96

iTrader: (26)

I've been having an issue with my truck almost wanting to die every time I stop. I though it was to low on required air flow and was messing with it, but I'd get it to where it was better, then it would "cruise control" all the time driving it around cuz air flow was set too high.

So today I did some logging and I found out it is dropping the spark down very low every time it would come to an idle especial in gear. RPM would drop to 2-300 then spark would jump back up to 14-20 and dance like it's supposed to at idle. I noticed that every time it would do it's near dieing/dieing thing, it would be cuz the spark is like 0 to -5 or really low, then it would bounce back up and all is fine. I logged all the spark pids and can't find anything pulling timing and all the base spark number are set around 25* so I'm stumped...

Any one have any idea what's dropping my timing so much??? Seems the worst when it goes from rolling idle to complete stop. Here is my current tune and log to show what its doing...

ayousef

idle overspeed spark adjustment will lower spark to lower the engine speed, this could be caused by a vaccum leak, look for one for starters.

BlackGMC

iTrader: (31)

Definately check out the over and under spark tables. I believe they are in the idle section

kbracing96

iTrader: (26)

The timing drop seems to happen right as the rpm crashes... I've been all through this tune and I can find anything to make it pull timing... This all started when I install this cam...

GMCtrk

iTrader: (27)

Did you perform the RAFIG procedure?

MikeGyver

iTrader: (5)

I will make a guess and say that you end up adding idle air flow, and decreasing the cracker airflow. Maybe even making the throttle follower in gear decay rate longer.