- Jan 6, 2013
- 637
I see I may have to pursue this and thought I'd see if I got it right. In OD I get P0894 whenever I drive highway and the PCM commands lockup of the converter. I feel that just being in 4th and having no lockup, things would be just fine and the transmission temps would stay down. With the temps up after a run in 4th with lockup, I get the harsh 1-2 shift afterwards. I tried just 3rd over the same course, and had no harsh 1-2 bump shift when I got off the highway. Control the temps by avoiding lock up, and I reason I should be able to drive in OD with an unlocked TC and still maintain better transmission temps along with avoiding the damage the slippage must obvously be causing. Do I have that right?
So the PWM mod from searching around shows the PWM solenoid installed without the O-ring and end filed down some to allow the transmission to bypass and effectively build no pressure to the TC lockup. Is there side effect to this over the long haul such as the pump being robbed of capacity due the very large internal leak we have effectively made? Is removing the PCM control ground an alternate way of accomplishing the same ting? I'm positive the PCM won't be happy either way when it fails to lock the TC or see the ground resulting in a check engine light. I'd like to hear back long term experience from anybody here who has tried or currently still uses this mod.
Cornchip.
So the PWM mod from searching around shows the PWM solenoid installed without the O-ring and end filed down some to allow the transmission to bypass and effectively build no pressure to the TC lockup. Is there side effect to this over the long haul such as the pump being robbed of capacity due the very large internal leak we have effectively made? Is removing the PCM control ground an alternate way of accomplishing the same ting? I'm positive the PCM won't be happy either way when it fails to lock the TC or see the ground resulting in a check engine light. I'd like to hear back long term experience from anybody here who has tried or currently still uses this mod.
Cornchip.