D Mode Sport feels slow after maintenance
#1
Driver
Thread Starter
D Mode Sport feels slow after maintenance
I tried searching and didn't see any existing topics on this. When in Sport, D mode, the car feels noticeably sluggish and doesn't pull. I'm definitely still hitting the "button" below the pedal. If I flip it over into M mode, it pulls just like normal.
I recently did some basic maintenance last weekend. I changed my engine oil and filter, and I replaced my air filter. I also did the maintenance reminder reset (hold Odo, press start twice).
Did this reset do anything with my ECU where it needs to re-learn how I drive in D mode, even with Sport on? It was my understanding that the "learning" only applied with Sport off. Any ideas?
I recently did some basic maintenance last weekend. I changed my engine oil and filter, and I replaced my air filter. I also did the maintenance reminder reset (hold Odo, press start twice).
Did this reset do anything with my ECU where it needs to re-learn how I drive in D mode, even with Sport on? It was my understanding that the "learning" only applied with Sport off. Any ideas?
#2
Instructor
iTrader: (5)
Although i havent changed the oil on my F (just accuire it last month) I'm pretty sure you just need to reset yout ecu and get it relearning again. I had same issue when i had my is350. Everytime after an oil change, my car would run sluggish. Pulled the fuses and drove it around town and its back on par.
#5
Tech Info Resource
iTrader: (2)
Although i havent changed the oil on my F (just accuire it last month) I'm pretty sure you just need to reset yout ecu and get it relearning again. I had same issue when i had my is350. Everytime after an oil change, my car would run sluggish. Pulled the fuses and drove it around town and its back on par.
Oil change and it feels slower? Are you sure the airbox is properly sealed? My car has never changed how it runs after an oil, oil filter, and air filter change.
#6
Tech Info Resource
iTrader: (2)
#7
Driver
Thread Starter
SOLVED:
I have the issue fixed. I was searching around and saw another owner with my exact same problem:
https://www.clublexus.com/forums/is-...ery-issue.html
I sent him a PM, and he said his problem was occurring because his airbox was not properly sealed. Sure enough, I checked under the hood and my airbox was not engaging the back tab. The box not being sealed must have been creating some turbulence and throwing off the MAF. Just got back from a test drive and all is back to normal. Thank you Vervish!!
I have the issue fixed. I was searching around and saw another owner with my exact same problem:
https://www.clublexus.com/forums/is-...ery-issue.html
I sent him a PM, and he said his problem was occurring because his airbox was not properly sealed. Sure enough, I checked under the hood and my airbox was not engaging the back tab. The box not being sealed must have been creating some turbulence and throwing off the MAF. Just got back from a test drive and all is back to normal. Thank you Vervish!!
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#10
Instructor
iTrader: (5)
WTF? There is no reason to do this. Your ECM does not ever need to be reset unless there is a DTC or a pending DTC. Your ECM never stops learning. Ever. It is constantly making adjustments to fuel and timing and registering a history which can be extremely valuable when troubleshooting.
Oil change and it feels slower? Are you sure the airbox is properly sealed? My car has never changed how it runs after an oil, oil filter, and air filter change.
Oil change and it feels slower? Are you sure the airbox is properly sealed? My car has never changed how it runs after an oil, oil filter, and air filter change.
#11
Tech Info Resource
iTrader: (2)
There was something wrong with your car that never got fixed. There is nothing in an oil change to impact the ECM's calibrations.
The ECM starts learning as soon as the coolant is over 140 degrees, and applies long term and short term trim to fuel as soon as the engine hits normal temperature (82C) and goes into closed loop. Seconds. The whole "you need to drive it around for a couple of hundred miles" comes from people who don't know how Toyota's TCCS works.
The ECM starts learning as soon as the coolant is over 140 degrees, and applies long term and short term trim to fuel as soon as the engine hits normal temperature (82C) and goes into closed loop. Seconds. The whole "you need to drive it around for a couple of hundred miles" comes from people who don't know how Toyota's TCCS works.
Last edited by lobuxracer; 03-20-15 at 01:56 PM.
#12
Instructor
iTrader: (5)
^^Nothing was wrong. I even took it to my local lexus dealership and advise this issue. They said it was normal. Pulling the fuse was a faster way of letting it learn to your driving habbit. I did notice when i did a custom exhaust on my F, power gains were instant and off the bat, low end torque was definitely improved.
#15
Tech Info Resource
iTrader: (2)
^^Nothing was wrong. I even took it to my local lexus dealership and advise this issue. They said it was normal. Pulling the fuse was a faster way of letting it learn to your driving habbit. I did notice when i did a custom exhaust on my F, power gains were instant and off the bat, low end torque was definitely improved.
Last edited by lobuxracer; 03-20-15 at 02:33 PM.