99 Lexus rx300 u140f transmission will not shift into overdrive. Code says S4 solenoid stuck or valve body plugged. Have dissected the valve body 4 times, found nothing. Replaced S4 solenoid even though it tested good, by applying power and air to verify opening and closing properly. Toyota dealer says trany is bad. Lexus dealer "we'll fix it and send you the bill!" Not to be. It refuses to shift, does not slip. In the past it has refused to shift out of second on two occasions, traced this to vvt control solenoid, cleaned them and it shifted fine. Car does not accelerate as it should and seems sluggish (mixture too rich?) I think it will not shift because the computer believes the engine is under too high a load and will not allow it to shift. Have cleaned the vvt solenoids just for grins. Any ideas from your crystal ball?
Friday, April 15th, 2011 AT 3:29 AM