lesaew, Try using Manual 2nd Gear with Shifter lever (moderate acceleration) shift in to D and note if shift is better or very delay and harsh. If Manual 2nd won't go or it slips a lot (where your truck is really laboring to move with High RPM and not much acceleration) then it could be:
- Misadjusted Manual Lever Position Sensor "MLPS", contaminated wires at either MLPS or Solenoid Valve Body Connector.
Shift Solenoid 1 / Shift Solenoid 2. Internal / Hydraulic - Intermediate Clutch or One Way Clutch Malfunction or what happens a lot and most often - "BURNED BAND".
If it does NOT slip when taking out in manual 2nd
more test needs to be done. The MLPS and/or Throttle Position Sensor could be suspect. There is a test procedure for TPS
, 5 volts at full throttle (engine off / key on).
If you have fully functional Manual 2nd Gear - Run LIMP MODE TEST.
If it will take out okay in Manual 2nd Okay you can put your E4OD
in LIMP MODE by removing the Connector to the Solenoid Valve Body. This will bypass electrical control affected by TPS
, MLPS and I think Vehicle Speed Sensor signal is ignored as well.
Run this LIMP MODE Test with moderate acceleration:
Start out in OD/D on shifter
- while in LIMP MODE the E4OD
will take out in 2nd Gear and then will shift to OD
4th gear. If you get the same "Delay / Late" shift out of 2nd (and it will be a some what slower shift in to 4th) then its not a sensor. If the shift is not as hard and more like a normal shift from 2nd to 4th then its more likely a sensor.
If sensor(s) are suspected then get the codes pulled by a professional. You can also buy a scanner but, its going to be $100+ and do get one that can scan ABS
Let me know what you find out or if I need to explain more in detail
Also, check out my E4OD
Free Tips eBook - it will give you some more diagnostic information, codes and better idea of the parts and updates made for your E4OD