Porsche 928 Workshop Manual page 1128

38
Automatic Transmission/Sears, Valve Body
928
Condition:
Automatic, unwanted downshifts outside of partial throttle downshift range,
without operation of kickdown switch.
Cause/Correction:
1. Remove kickdown solenoid valve.
Check O-ring on solenoid valve for damage
2. Check whether kickdown switch sticks in pressed
position, replacing if necessary.
3. Check whether solenoid valve sticks in open position,
replacing if necessary.
Condition:
Poor acceleration when moving off.
1. Check stall speed
2. If stall speed drops below specified value by approx
400 to 700 rpm. one-way clutch in converter
is slipping. Replace torque converter.
l
38. 118
Troubleshooting
Printed in Germany