'04 LS430 Throttle Tip-In Problem?
12-10-04, 11:50 AM
#16
I had the software upgrade completed this morning and have completed one 20 mile journey back from the dealer to my office.
As anyone with this problem knows the symptoms are somewhat intermittent - some days it can be better than others - so I would treat this preliminary feedback with a little caution.
If I were to answer the simple question: "Is it better after the change?" the answer would be a tentative yes.
Do I still experience the hesitation/jerkiness at low speeds (accelerating in traffic at or below 10mph)? It appears to be better.
It also appears to have made an improvement at higher speeds, seemingly being in the right gear more often as I respond to changing traffic conditions, giving the impression of more smoothness.
One thing that I realized is that I am sensitized to the problem and so it might take me a little while to "unlearn" compensation behavior and just drive normally - if I can forget to think about accelerator position as I drive then I will judge this upgrade a complete success.
I will update my impressions over the next few days as I put more miles on the car.
As anyone with this problem knows the symptoms are somewhat intermittent - some days it can be better than others - so I would treat this preliminary feedback with a little caution.
If I were to answer the simple question: "Is it better after the change?" the answer would be a tentative yes.
Do I still experience the hesitation/jerkiness at low speeds (accelerating in traffic at or below 10mph)? It appears to be better.
It also appears to have made an improvement at higher speeds, seemingly being in the right gear more often as I respond to changing traffic conditions, giving the impression of more smoothness.
One thing that I realized is that I am sensitized to the problem and so it might take me a little while to "unlearn" compensation behavior and just drive normally - if I can forget to think about accelerator position as I drive then I will judge this upgrade a complete success.
I will update my impressions over the next few days as I put more miles on the car.
Last edited by Mandingo; 12-10-04 at 06:39 PM.
12-10-04, 01:09 PM
#17
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Based on this article concerning the ES series I would think Lex is aware of this:
http://www.post-gazette.com/pg/04343/423383.stm
d
http://www.post-gazette.com/pg/04343/423383.stm
d
12-10-04, 04:01 PM
#18
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Mandingo-
My dealer claims to have not heard of the update. Can you look at your service receipt and see if their is a description that is useful for me to quote to them. Thanks!
Ian
My dealer claims to have not heard of the update. Can you look at your service receipt and see if their is a description that is useful for me to quote to them. Thanks!
Ian
12-11-04, 09:07 AM
#21
My 1999 LS 400 does the exact same thing, always has too. If I go slow over a speed bump, and try to go, it hesitates and surges forward, so I always take it easy on Coast-Go situations. It does seem like this is very common in the Drive By Wire designs.
Also wanted to mention that if I replace my air filter, the problem vanishes for a day or so, not sure if the ECU detects a change in air flow and does something I am unaware of, but after 3 filter changes it did it very time. Also, removing power from my battery does the same thing.
Could this be related to the "Learning driving pattern" that the ECU does?
Also wanted to mention that if I replace my air filter, the problem vanishes for a day or so, not sure if the ECU detects a change in air flow and does something I am unaware of, but after 3 filter changes it did it very time. Also, removing power from my battery does the same thing.
Could this be related to the "Learning driving pattern" that the ECU does?
Last edited by lotus; 12-11-04 at 09:10 AM.
12-11-04, 09:32 AM
#22
I suspect the learning feature of the transmission is more trouble than it's worth. People like predictable user experiences.
This is similar to the "learning menus" in recent Windows applications - items change their positions on menus according to how frequently they're used. Great idea in theory, in practise it just frustrates the heck out of users because the experience becomes unpredictable.
This is similar to the "learning menus" in recent Windows applications - items change their positions on menus according to how frequently they're used. Great idea in theory, in practise it just frustrates the heck out of users because the experience becomes unpredictable.
12-11-04, 10:44 AM
#23
Originally posted by lotus
My 1999 LS 400 does the exact same thing, always has too. If I go slow over a speed bump, and try to go, it hesitates and surges forward, so I always take it easy on Coast-Go situations. It does seem like this is very common in the Drive By Wire designs.
Also wanted to mention that if I replace my air filter, the problem vanishes for a day or so, not sure if the ECU detects a change in air flow and does something I am unaware of, but after 3 filter changes it did it very time. Also, removing power from my battery does the same thing.
Could this be related to the "Learning driving pattern" that the ECU does?
My 1999 LS 400 does the exact same thing, always has too. If I go slow over a speed bump, and try to go, it hesitates and surges forward, so I always take it easy on Coast-Go situations. It does seem like this is very common in the Drive By Wire designs.
Also wanted to mention that if I replace my air filter, the problem vanishes for a day or so, not sure if the ECU detects a change in air flow and does something I am unaware of, but after 3 filter changes it did it very time. Also, removing power from my battery does the same thing.
Could this be related to the "Learning driving pattern" that the ECU does?
12-12-04, 07:54 AM
#24
UPDATE:
I have put 100 miles on the car since the software update and the good news is that the car is noticably smoother than before across the entire speed range.
Low speed driving around town is now a pleasure - slow speed corners now seem effortless with no sense of being in too low a gear - cruising around parking lots looking for a space are no longer a feather-the-throttle balancing act.
10mph pick up is easier - I wouldn't say it's perfect but it is significantly easier to coast and go than before.
As others have pointed out resetting the ECU can have a positive (temporary) effect and so I need to drive it another week before being 100% convinced this has resolved the problem, but so far so good.
I have put 100 miles on the car since the software update and the good news is that the car is noticably smoother than before across the entire speed range.
Low speed driving around town is now a pleasure - slow speed corners now seem effortless with no sense of being in too low a gear - cruising around parking lots looking for a space are no longer a feather-the-throttle balancing act.
10mph pick up is easier - I wouldn't say it's perfect but it is significantly easier to coast and go than before.
As others have pointed out resetting the ECU can have a positive (temporary) effect and so I need to drive it another week before being 100% convinced this has resolved the problem, but so far so good.
12-13-04, 06:49 PM
#25
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WOW!!!!!! that is great that they know what that is & can fix it (I HOPE) !!!1
I thought it was just me ,,,,, it is such a suttle thing you are not sure it is
really a problem.....
I thought it was just me ,,,,, it is such a suttle thing you are not sure it is
really a problem.....
12-15-04, 04:37 PM
#26
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i made an apointment to have mine done next week. I was in the dealers today with my wife's GX 470
& I showed him the ### & he found it & said he will take care of it next week.... I HOPE at that point my 2004 LS 430 will be as perfect as my 2001 LS430 was....... This was my only real complaint....
& I showed him the ### & he found it & said he will take care of it next week.... I HOPE at that point my 2004 LS 430 will be as perfect as my 2001 LS430 was....... This was my only real complaint....
12-16-04, 06:50 AM
#27
FWIW, it is now a week since having the new software and the car still appears to be doing much better.
The twitchy throttle response is 90% improved and I am learning to appreciate the LS430 all over again.
It has transformed the car for me, hopefully you will have a similar experience.
The twitchy throttle response is 90% improved and I am learning to appreciate the LS430 all over again.
It has transformed the car for me, hopefully you will have a similar experience.
12-16-04, 08:32 AM
#28
Originally posted by Mandingo
FWIW, it is now a week since having the new software and the car still appears to be doing much better.
The twitchy throttle response is 90% improved and I am learning to appreciate the LS430 all over again.
It has transformed the car for me, hopefully you will have a similar experience.
FWIW, it is now a week since having the new software and the car still appears to be doing much better.
The twitchy throttle response is 90% improved and I am learning to appreciate the LS430 all over again.
It has transformed the car for me, hopefully you will have a similar experience.
12-16-04, 11:02 AM
#29
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Grand
My 98 did this also when I first bought it. I posted here and others had the same issues.
I took my car in for its 30k service or somthing like that and they did a injector cleaning. After that the throttle problem TOTALY went away. JBRADY here on CL had the same issue, I dont know if his went away.
Jerry
My 98 did this also when I first bought it. I posted here and others had the same issues.
I took my car in for its 30k service or somthing like that and they did a injector cleaning. After that the throttle problem TOTALY went away. JBRADY here on CL had the same issue, I dont know if his went away.
Jerry
12-16-04, 03:22 PM
#30
Originally posted by Horta
Grand
My 98 did this also when I first bought it. I posted here and others had the same issues.
I took my car in for its 30k service or somthing like that and they did a injector cleaning. After that the throttle problem TOTALY went away. JBRADY here on CL had the same issue, I dont know if his went away.
Jerry
Grand
My 98 did this also when I first bought it. I posted here and others had the same issues.
I took my car in for its 30k service or somthing like that and they did a injector cleaning. After that the throttle problem TOTALY went away. JBRADY here on CL had the same issue, I dont know if his went away.
Jerry
