Couple of questions about my isf.
#1
Couple of questions about my isf.
I've been driving my '11 isf for two weeks already and have noticed some things that I'm not sure are normal.
1. I usually drive in very heavy bumper to bumper traffic. I notice that this car has a lot of engine brake. As soon as I release the accelerator to coast at very slow speeds (below 15mph), the car starts making the usual noise that a manual car does when engine braking. The car doesn't coast freely and I can feel the engine brake. Is this normal?
2. While in stop and go traffic the trassmission is not as smooth as some people mention. sometimes it hangs too long in a gear and sometimes it even jerks the car a bit.
3. I've read that the car is supposed to be quiet at lower rpms, but mine is not that quiet. It has a nice low rumble. Sometimes it does gets a bit droney (if thats a word). I don't mind it, but just want to make sure that all this is normal.
Thanks
1. I usually drive in very heavy bumper to bumper traffic. I notice that this car has a lot of engine brake. As soon as I release the accelerator to coast at very slow speeds (below 15mph), the car starts making the usual noise that a manual car does when engine braking. The car doesn't coast freely and I can feel the engine brake. Is this normal?
2. While in stop and go traffic the trassmission is not as smooth as some people mention. sometimes it hangs too long in a gear and sometimes it even jerks the car a bit.
3. I've read that the car is supposed to be quiet at lower rpms, but mine is not that quiet. It has a nice low rumble. Sometimes it does gets a bit droney (if thats a word). I don't mind it, but just want to make sure that all this is normal.
Thanks
#2
Racer
iTrader: (2)
When you experience issue number 1 and 2, what type of transmission mode are you in?
If you are in "Manual" mode, the car will feel a bit jerky slowing down as the torque converter is locked.
If you are in "Automatic" mode, then you might have an issue. You will also notice a "feature" in Automatic mode that if you punch it and take off, then let off the gas really quick, the car will stay in the same gear for you, so that you can take off quicker. If you dont put your foot back down, the car will eventually shift into the next gears.
The car does drone a bit at lower RPM's however you have to really listen for it. Its a bigger V8
If you are in "Manual" mode, the car will feel a bit jerky slowing down as the torque converter is locked.
If you are in "Automatic" mode, then you might have an issue. You will also notice a "feature" in Automatic mode that if you punch it and take off, then let off the gas really quick, the car will stay in the same gear for you, so that you can take off quicker. If you dont put your foot back down, the car will eventually shift into the next gears.
The car does drone a bit at lower RPM's however you have to really listen for it. Its a bigger V8
#3
I'm in auto mode when I experience this. I've noticed that if I let it coast long enough, the engine eventually releases and coasts freely. For example if I'm going at 30mph and release the accelerator, the car feels like is engine breaking and then it like releases and I feel the jump in speed when it does.
#4
Racer
iTrader: (2)
usually in a normal auto transmission the torque converter only locks when you are crusing and using light throttle (to help with gas mileage).
are you in sport mode by chance as well?
if you are very concerned take the car in and go for a ride with the F Champion tech. they will be happy to help you.
are you in sport mode by chance as well?
if you are very concerned take the car in and go for a ride with the F Champion tech. they will be happy to help you.
#6
Racer
iTrader: (2)
By all means, take the car in and have it looked at. They will probably scan the computer for any trouble/error codes that might be popping up, etc.
At the least you can have it documented that you brought it in for the issue, in case anything pops up later.
#7
Sounds like normal but i have a question. Did you get the car used? Or new? Previous owner may have driven your car different and the tcm learns that driving pattern. Now that its going through different driving by a different driver its clashing and is actually tying to learn the new pattern to suite the driver and car better. You can go to lexus and get it reset so the tcm learns your driving style. Just make sure when they do if you decide to do it, get on sport mode, and punch it, hard. Hope this helps and good luck
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#13
Racer
iTrader: (4)
So what exactly happens when you switch between different modes? Sport mode - Accelerator feels more responsive, Normal mode - Feels like eco mode, haven't tried Snow mode... as soon as you hit that button, does the computer change settings on the accelerator or is there more to it?
#14
So what exactly happens when you switch between different modes? Sport mode - Accelerator feels more responsive, Normal mode - Feels like eco mode, haven't tried Snow mode... as soon as you hit that button, does the computer change settings on the accelerator or is there more to it?
#15
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Join Date: Mar 2012
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I know your question has been answered but to further reassure you the "engine braking" feeling is normal. My F does it and a few other Lexus sedans I have owned did this too. It is completely normal. In response to the second question, your car is fine. From my research these cars are equipped with an adaptive 8 spd trans, thus meaning the car picks up on how your driving and shifts accordingly. I don't know why it would hang a little longer in first in traffic but mine does it too.
In summary, your car is mint...relax and enjoy this fine automobile.
In summary, your car is mint...relax and enjoy this fine automobile.
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