Why does my transmission not shift into 3rd or 4th?
P0121 is a throttle position sensor and the P0171 ha to do with the engine running too lean Any luck getting this addressed since your last post, Ozzie? Not yet, I think I will try replacing the solenoids in the transmission first. If that doesn’t work then I guess its time to have it rebuilt.
Why is my 4L60E not shifting into overdrive?
As the 4L60E ages, one of the most common problems that it develops is that it won’t shift into overdrive anymore. Without overdrive, your vehicle turns into a time machine and takes you back to an era where it was the norm for a vehicle to scream down the highway at 3000 RPM.
How does the 2nd servo shift into 3rd gear?
It is however related since the 2nd servo is also the 3rd accumulator. The 3rd accumulator checkball is open in 2nd gear and allows the 2nd servo to move and engage the 2-4 band. When the unit shifts to 3rd gear, pressure is applied to the release side, or 3rd accumulator side of the 2nd servo.
Why does my Chevy 700R4 not shift into 3rd?
Being a former Chevrolet Technician I can tell you that is a common failure on the early model 700R4. Up until 1993 the trans used a TV cable for throttle input to the trans. In 1993 the trans was redesigned and now has shift solenoids for shift control.
Why does my transmission jerk when I shift gears?
Transmission fluid that has aged and lost some of its frictional properties can also lead to poor shift quality. When your vehicle’s computer tells the transmission to shift gears, hydraulic pressure (provided by the fluid) squeezes a series of plates together inside a clutch pack…
Is there a GM hard shift transmission defect?
Ultimately, GM owners and lessees face mounting repair costs because of the alleged defect, the complaint says.
What happens when you have a bad Shift Solenoid?
Erratic shifting or shift slippage: The shift solenoids regulate the flow of hydraulic fluid for shifting. A problem with one or more of the solenoids can cause a lack of pressure, resulting in hard, soft or delayed shifts.