03 sierra 4L80e swap now no lockup and hard 1-2 shift
02-19-2012, 11:47 PM
#1
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03 sierra 4L80e swap now no lockup and hard 1-2 shift
So I swapped a 4L80e into my 03 sierra denali awd quadrasteer the other day. Using a nelson conversion harness, pinned the ecm for the additional speed sensor. Had a segment swap done and sent to me from Bill. Mechanically, everything seems fine. It is a triple disk 2600 stall from circle D, jake's performance level 3 4L80e. Now here are the issues:
-No lockup. Even when I try to manually command lockup it will not lock up. If I change pulse width modulation to 100% it will lock up and stay locked. Not throwing any codes so I doubt it is related to a misfire?
-The 1-2 shift is very hard. I upped the torque management to pull half the torque on the shift in my last change and it does not seem to pull the timing like it should. Sometimes it will do nothing, sometimes it will pull the torque after the shift occurs for a second or two.
Just trying to figure out where to start since this isnt making very much sense to me. Thanks
-No lockup. Even when I try to manually command lockup it will not lock up. If I change pulse width modulation to 100% it will lock up and stay locked. Not throwing any codes so I doubt it is related to a misfire?
-The 1-2 shift is very hard. I upped the torque management to pull half the torque on the shift in my last change and it does not seem to pull the timing like it should. Sometimes it will do nothing, sometimes it will pull the torque after the shift occurs for a second or two.
Just trying to figure out where to start since this isnt making very much sense to me. Thanks
02-20-2012, 01:17 AM
#3
So I swapped a 4L80e into my 03 sierra denali awd quadrasteer the other day. Using a nelson conversion harness, pinned the ecm for the additional speed sensor. Had a segment swap done and sent to me from Bill. Mechanically, everything seems fine. It is a triple disk 2600 stall from circle D, jake's performance level 3 4L80e. Now here are the issues:
-No lockup. Even when I try to manually command lockup it will not lock up. If I change pulse width modulation to 100% it will lock up and stay locked. Not throwing any codes so I doubt it is related to a misfire?
-The 1-2 shift is very hard. I upped the torque management to pull half the torque on the shift in my last change and it does not seem to pull the timing like it should. Sometimes it will do nothing, sometimes it will pull the torque after the shift occurs for a second or two.
Just trying to figure out where to start since this isnt making very much sense to me. Thanks
-No lockup. Even when I try to manually command lockup it will not lock up. If I change pulse width modulation to 100% it will lock up and stay locked. Not throwing any codes so I doubt it is related to a misfire?
-The 1-2 shift is very hard. I upped the torque management to pull half the torque on the shift in my last change and it does not seem to pull the timing like it should. Sometimes it will do nothing, sometimes it will pull the torque after the shift occurs for a second or two.
Just trying to figure out where to start since this isnt making very much sense to me. Thanks
The tight converter is going to make it feel harder than usual, we can detune the shifts a bit.
Last edited by AKlowriderZ71; 02-20-2012 at 01:31 AM.
02-20-2012, 12:17 PM
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Thanks Jake. I was wondering about the wiring or segment as a possible cause, especially since I cant command lockup and I cant seem to command torque management during the shifts. Is there any reason I could not swap harnesses to a full harness from a 2500 truck that had the 4L80e stock? Seems a bit excessive but if this conversion harness wont work right it may be my only option.
02-26-2012, 06:48 PM
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Using hptuners, just trying to toggle it "on" doesnt work, but setting pwm to 100% does work. But normal driving it never seems to lock up like it should. All the tables are still set to stock.
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