ferocity02
April 24th, 2013, 03:14 AM
Been having this issue for awhile. During cranking the spark is correct, around 13 deg. But once it starts running the spark drops to a very low value, ~0-6 deg for less than a second, causing the idle to drop and it almost wants to die. But then the spark ramps back up and the idle flares up also. After a second or two it will eventually find the correct idle speed and base idle spark (24 deg). It does this much worse when cold. It will do it immediately after a flash also so it probably doesn't have anything to do with learned values.
I logged some spark PIDs during startup and ASPARK dropped to almost zero after cranking. There was also spark retard from brake torque management but I don't think it was actually doing anything. While driving, spark matches the high-octane table despite the BTM spark retard.
Anyone know what could be happening? It's a '01 5.3L with a T56 running a 4L60E tune. Please don't suggest I should use a manual transmission segment... I have, and it does not work as well as the auto segment for some reason :ermm: I still had this issue with the manual segment.
Thanks!
I logged some spark PIDs during startup and ASPARK dropped to almost zero after cranking. There was also spark retard from brake torque management but I don't think it was actually doing anything. While driving, spark matches the high-octane table despite the BTM spark retard.
Anyone know what could be happening? It's a '01 5.3L with a T56 running a 4L60E tune. Please don't suggest I should use a manual transmission segment... I have, and it does not work as well as the auto segment for some reason :ermm: I still had this issue with the manual segment.
Thanks!