Quote:
Originally Posted by oab_au
I think your problem is related to the line pressure that has been increases when the the valve body was modified.
This raises problems with the Transfer clutch that can bind due to the higher pressure.
It also causes problems with the over-run clutch, because when the box is in D or 3rd position, the over-run clutch is not allowed to operate while the throttle is on or it will cause interlocking.
It knows this because it is looking at the line pressure, that it expects to drop to a set level to show that the throttle is closed.
This is the same pressure that the modification has raised, so it never gets to the set pressure that tells it that the throttle is closed and its OK to apply it.
Harvey.
|
Line pressure which is involved with the control of automatic shifting, is regulated by the TCU via solenoid A. The base line pressure, as could be affected by a mechanical modification, is regulated. The use of a bleed system is very affective in the instance off adjusting against increased pressures.
It could be argued that the regulated pressure could be raised on a percentage basis, but pulse length modulation of solenoid A and the time element, means that such would be minimal.