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Hesitation On Acceleration--2012 RX 350

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Old 08-23-15, 03:51 AM   #136
mcdgary
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Smile A senior Lexus tech/mechanic went with me on a test drive

We rode around town and I tried to duplicate past situations where my RX 350 would hesitate on a gas pedal input. I did not get a real good example. After a few miles he said I had somewhat of a habit of left foot on break pedal while right foot on gas pedal, which may confuse the computerized system as to "accel" or "brake?" Seems to make sense to me, and I have tried to avoid this anomaly. I now have fewer situations of the hesitation on acceleration.
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Old 02-21-16, 09:05 AM   #137
DuvalM
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Default Throttle hesitation

I have a 2015 RX 350 with 4,600 miles on it. This is the fourth or fifth RX 350 I have leased for my wife. This is the second one that has had a throttle hesitation. Last night, after driving for 25 minutes on the highway, I took the off-ramp, took my foot off the gas pedal and slowed down into the turn. The turn merged with another off ramp and I needed to speed up quickly to move in front of an oncoming car. There was a demonstrable pause in the acceleration that all passengers felt. My guess is I had slowed to around 40-50 mph and then tried to accelerate. This is not the first time and it is, to put it mildly, very disconcerting. I have read that this may be due to the six speed electronic transmission trying to figure out what gear to grab onto or having to make a 2-3 gear change.


Any concrete input will be greatly appreciated. Perhaps the solution is to keep the transmission in manual, which my wife would definitely not do. Has Lexus recognized this issue and do they have a solution?

Thank you.
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Old 02-21-16, 11:41 AM   #138
CanadianRX
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I think it's just the lazy automatic, I usually pop it into sport during a merge on the highway or if I know I want it more responsive since it seems to ignore the overdrive gears 5 and 6.

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Originally Posted by DuvalM View Post
I have a 2015 RX 350 with 4,600 miles on it. This is the fourth or fifth RX 350 I have leased for my wife. This is the second one that has had a throttle hesitation. Last night, after driving for 25 minutes on the highway, I took the off-ramp, took my foot off the gas pedal and slowed down into the turn. The turn merged with another off ramp and I needed to speed up quickly to move in front of an oncoming car. There was a demonstrable pause in the acceleration that all passengers felt. My guess is I had slowed to around 40-50 mph and then tried to accelerate. This is not the first time and it is, to put it mildly, very disconcerting. I have read that this may be due to the six speed electronic transmission trying to figure out what gear to grab onto or having to make a 2-3 gear change.


Any concrete input will be greatly appreciated. Perhaps the solution is to keep the transmission in manual, which my wife would definitely not do. Has Lexus recognized this issue and do they have a solution?

Thank you.
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Old 02-21-16, 11:53 AM   #139
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I had to "step on it" this morning to merge and RPM went to about 4K and just a slight hesitation. I have forgotten the solution of putting it in S5 when going on the on ramp which worked for me before.

Try the S5 and see if it works for you.
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Old 02-21-16, 10:08 PM   #140
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I have a 2011 Rx350 and it does have an hesitation when accelerating from 6th gear in normal shift mode.

It do not inspire confidence in its ability to do a quick passing maneuver on the highway since the acceleration lag is long.

Sport mode shifting does better, but really burns gas and kill the gas mileage.

However, sport mode is pretty responsive and make passing on the highway a bit more predictable.
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2004, 2010, 330, 5th, car, gear, hesitating, hesitation, lag, lexus, rx, rx350, shift, throttle, transmission, wont

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