1994 LS400

Hello ~
I have a 1994 LS and I have had this "issue" as far back as I can remember. Ok when I am driving the car @ 50 mph and below what I am talking about does NOT occur. However when I go 50 mph and above this occurs. Just to verify, it is normal when you are going at highway speeds to lightly tap the gas and the RPM's raise for a second then they will lower quickly ...Lexus told me this is our "Locking Torque Converter" this sound correct? However, my concern is when I lightly take my foot off the gas at highway speeds, my RPM's suddenly jump up! It is not a huge jump, the needle will maybe go up one little notch or maybe 2 at the most, then go back down when I press the gas. I am assuming the car is well into 4th gear by these speeds.... or maybe not? First off.... is this behavior normal? Secondly would it have anything to do with the TPS Sensor...I had this replaced last year and I can remember when it was not calibrated to the proper setting, the car preformed awful...in fact it was again when I would lightly tap the gas, the tranny/engine would shutter and shake unless I pressed the gas harder ... because the TPS was not calibrated properly, I took the car into Lexus for a calibration of the new TPS to fix the shuttering problem and the adjustment in fact solved that problem... no more shuttering....so at this point I am leaning toward the TPS !?!?. If anyone can help me out on this one please let me know.
Thanks,
Paul

EXE.UCF10

iTrader: (3)

Doesn't sound like normal behavior to me. I'll have to check for myself and make sure, but I'm 99.9% sure it's not normal. When I take the my foot off the gas, the RPMs just steadily/smoothly drop...the only time the RPMs jump up is if I switch to 2nd gear to make a sharp turn.

EXE.UCF10

iTrader: (3)

Just checked up on it to make sure tonight...I was right in my previous post. The RPM's do not jump up at all when I slowly release on the gas pedal. Just to make sure, I tried this at 60-90 mph.

joshthorsc

My sc400 doen't do that either. After I let off the gas at freeway speeds the rpm just slowwly goes down. It doesn't jump a notch at all and I have over 162k.

jayyaree

I have a 1997 lexus es 300 but im having a problem with it right now I turn on my car it turns on good but when I put it on drive my rpm goes up quick but my speed meter goes up slowly and I really dont know anything about it ive changed the spark plugs ive done an oil change but I havent done a transmission fluid change if that sounds right I need help idk what it can.be any answers are welcomed please! it also has 140k miles

please get at me @ jayyare267k@gmail.com

sha4000

iTrader: (1)

Might have better luck in the Es300 forum.