Quote:
Originally Posted by JS_4.8
thats funny cause just today i said to myself that i need tocall the dealer on this issue. it seems the truck holds some of the gears too long and then has a jerky shift........even if im not in sport mode. does anyone know if this problem afflicts 4.8's as well, or is it just 4.4's. thanks!
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Yes, I have been through all sorts of problems with mine. The transmission software interacts with the central computer and selects gears based on throttle setting/brake pressure/speed/yaw rate etc.
The transmission has 4 software modes, being XE (extreme economy), E (economy), S (sport M) and XS (extreme sport M 1-6). The speed with which you press the throttle down from stop will tell the transmission which mode to use until it senses you backing off/cruising. Each time you do this it compares it against stored values it 'learns' from your actions over time.
There is also another setting which is called uphill/downhill mode and towing mode. These are designed to hold gears when under load/decelerating.
The first solution is to have the transmission re-programmed. That can make a short term solution as all stored entries are gone and your car feels great. After a month or so it may return to the faults described in a lot of threads here.
The second solution is to have the whole car computer (DME I think it's called) reflashed AS WELL as the transmission software.
Because the transmission takes its cue from so many sensors, the central computer can sometimes be the culprit.
I have had this done and have regained a missing uphill mode and better gear selection in low speed situations........ |
