2 Attachment(s)
High Speed Governor Kicking in?
Hey there. I've had an issue with my truck since before I started tuning, and now with the proper scanning capability, I'm seeing some things.
The issue has been that when I take off for the first time, my truck will hang in first gear, at about 2000rpm. The power rolls off softly starting around 1500rpm, and even with max throttle will only hit 2000rpm. I release the throttle pedal and repress and the truck will run normally the rest of the day. Sometimes if I hold the pedal, after a long delay, the torque will reappear as if a switch was flipped.
The scanner is telling me that around 2000rpm the master fuel correction reason is going from 'Running Nor', which I suspect is running normally, to 'High Speed ...' which I suspect is high speed governor. I don't know how to expand the window in the 'channels' window to see the entire text string. Not sure what I'm missing there!
Anyway, the settings for the governor are Low Limit: 1400, High Limit 3500, Setting 3500. Not sure what a low limit is for on a high speed governor? Starting point to start calculating limiting rate of rise of rpm perhaps?
When the transmission asks for defuel for a shift, is this how it shows up in the ecm? I have had some shuttle shifting 1-2. Not bad, just occasional. I haven't yet replaced the transmission transducer and solenoid.
Snapshot and settings enclosed.