RPM's jump up after letting foot off gas @ Highway Speeds ..... Normal !?!?
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Driver
Joined: May 2001
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From: Rhode Island
RPM's jump up after letting foot off gas @ Highway Speeds ..... Normal !?!?
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
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
Last edited by 1994 LS400; Jul 3, 2004 at 09:46 PM.
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.
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.
Update...
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. 
Driver School Candidate
Joined: Mar 2013
Posts: 1
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From: Riverside
I need help my rpm goes up high but my speed doesn't 97 lexus es300
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
please get at me @ jayyare267k@gmail.com
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
please get at me @ jayyare267k@gmail.com
Lead Lap
Joined: Feb 2013
Posts: 680
Likes: 0
From: Redmond wa
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
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
Or LED tail/brake lights?
Last edited by Jimthe1st; Mar 18, 2013 at 08:06 PM.
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