4L60 wont unlock or down shift at high speed
07-29-2015, 12:24 AM
#1
4L60 wont unlock or down shift at high speed Got a truck I am tuning on and I cant seem to figure out why above around 65+ it wont downshift or unlock the converter. I think I have went thru all the tables and cant find what is causing the issue. I even changed all the settings to the same as my car in the sig and still have the issue. Over temp setting is set to 266*. I will post the tune below. If anyone could put another set of eyes on it i would be much appreciative.
07-29-2015, 09:02 PM
#2
Moderator
Your tune file looks fine in the transmission shifting tables.
Since you have HPT, you might want to log TPS and MPH as engine sensor problems often cause strange trans behavior. You might also try disconnecting the MAF.
Since you have HPT, you might want to log TPS and MPH as engine sensor problems often cause strange trans behavior. You might also try disconnecting the MAF.