Hesitation problem at various speeds (TSB info post #159)
#151
If you have a F sport then though can customize ur so that the transmission would be in sorry and leave the suspension in eco or normal.
#152
Driver School Candidate
UPDATE: HEY GUYS! So far so good. I took my 16' 4RX in for the 5K service last weekend (told them about the transmission hesitation problem), and ever since I received the vehicle back, I haven't experienced the hesitation anymore in Normal driving mode (I'm in the Texas Southern Region and still using Regular 87 fuel). The engine acceleration feels much more responsive & predictable and driving is a lot more fun now. I feel like I can finally drive with confidence when crossing the street.
#153
Driver School Candidate
Wanted to give the group an update, my wife put 93 Octane in the car and noticed an immediate difference. She's been driving for the last week and the car is night and day different. Significantly smoother with the higher octane and the cars drives much better, take off is smoother and more aggressive. I didn't believe her so I drove the car and I'm a believer, still some very slight hesitation as I tried to create the hesitation scenario but I can say I like driving the car now. So that leads me to ask the question, is the problems trans related or is the engine tuned to run on the higher octane but Lexus is marketing their cars can run on 87 to increase sales? All the other Japanese and Luxury brands recommend premium gas for their 6 cylinder engines. I think Lexus still has some work to do on the transmission logic but as others have commented the premium gas definitely helps.
#155
Wanted to give the group an update, my wife put 93 Octane in the car and noticed an immediate difference. She's been driving for the last week and the car is night and day different. Significantly smoother with the higher octane and the cars drives much better, take off is smoother and more aggressive. I didn't believe her so I drove the car and I'm a believer, still some very slight hesitation as I tried to create the hesitation scenario but I can say I like driving the car now. So that leads me to ask the question, is the problems trans related or is the engine tuned to run on the higher octane but Lexus is marketing their cars can run on 87 to increase sales? All the other Japanese and Luxury brands recommend premium gas for their 6 cylinder engines. I think Lexus still has some work to do on the transmission logic but as others have commented the premium gas definitely helps.
#156
Driver School Candidate
Thanks, I've also asked her to track fuel economy for the next few tanks as well. For her it's not about the performance as she's a slow driver but she's definitely happy about the smoother drive.
#157
Same thing happens with NX. As one poster suggested, its because the car cannot find the right gear. This usually happens if you try to accelerate really fast from stop (or from slower speed). You may want to switch to sport mode if you want to do that and see if that resolves the issue.
#158
Driver School Candidate
#159
Driver School Candidate
Join Date: Jan 2017
Location: California
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Hesitation & Noise & Vibration
I too am a first time Lexus buyer with a RX350 and have noticed the same hesitation in the lower gears. Additionally, I hear what I can only describe as a "low moan" associated with a vibration when starting slowly. It is most pronounced when starting up a low incline. I just had a 5K service where I complained about these issues for the second time and was told that some drivers are complaining about this but that Lexus has not developed a "fix" for this just yet. They will not admit that it is a problem but it is clear that other drivers are experiencing these issues. I have a front wheel drive and am wondering if these problems are experienced by both front wheel and all wheel cars.
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Ibmimi (06-13-17)
#162
sad to report that after enjoying smoother throttle response on premium for 5 tanks, things reverted. Sad how we cant get a straight story from Lexus and its dealers...there is a fix, there isnt a fix, theres no problem, lexus knows and working on a fix, it's coming...
#164
Not sure if anything was done to update mine, but the hesitation seems to be disappearing ever since I reached the 3000+ miles. I have always used BP regular gas except for one tank of Shell regular.
#165
I apologize for the delayed response I was searching for the print out from the last visit at the dealership since the fix. I look at the work order (I stressed this acceleration/transition hesitation issue to the rep who was taking care of me and she did notify the mechanics about it), but there was nothing on the physical print out that lists the fix for it as I do believe what another member mentioned before in this thread that it would be a discreet fix once you bring your vehicle into the dealership (which makes me curious if it was an ECU transmission setting to make the MPG numbers look good, but don't quote me on that as I'm just speculating). To update from my last post, the hesitation transmission issue is still gone/fixed and it's still a pleasure to drive (and I'm still putting in regular 87 gas the entire time).
I'm trying to track my MPG to see if it has been affected, but I do mostly 70% city/30% highway and the highest was 24 MPG but average around 17-18 MPG which does seem a bit low...
I'm trying to track my MPG to see if it has been affected, but I do mostly 70% city/30% highway and the highest was 24 MPG but average around 17-18 MPG which does seem a bit low...