Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > DIY / Maintenance / Service
  The Tire Rack

Reply
 
Thread Tools Display Modes
Old 06-16-2019, 11:58 PM   #1
toyotavios_11
 
Drives: Toyota Vios
Join Date: Feb 2013
Location: MY
Posts: 29
Rpm drop fast after letting off throttle pedal

My car is 2007 model sedan with 1NZ-FE mated to U340 4AT.

Recently I notice that when the car is speeding up from 15km/h to 60km/h while the gear is at the point of time in 2nd or 3rd position, the moment I let off the throttle pedal, RPM needle will drop fast from 2000+ RPM to around 1000 RPM then surge a bit up to around 1200 RPM. I can hear there is a minor shock noise from the front and feeling a little bit of jerk.

While the gear is in 4th gear, either lock up or not, letting off the throttle pedal, RPM will just reduce slowly which I feel this is normal.

What are the possibilities of the problem?
toyotavios_11 is offline   Reply With Quote
Old 06-20-2019, 12:49 PM   #2
seatech30
 
Drives: Yaris 2008 Sedan
Join Date: Nov 2010
Location: California
Posts: 74
Is it possible the car is shifting into the next gear right around that point? What happens if you let off the gas at say 70km/h or 50km/h vs the 60km/h?

How's your trans fluid level?
seatech30 is offline   Reply With Quote
Old 06-30-2019, 06:22 AM   #3
toyotavios_11
 
Drives: Toyota Vios
Join Date: Feb 2013
Location: MY
Posts: 29
Quote:
Originally Posted by seatech30 View Post
Is it possible the car is shifting into the next gear right around that point? What happens if you let off the gas at say 70km/h or 50km/h vs the 60km/h?

How's your trans fluid level?
have no idea. perhaps i should perform fluid change.
toyotavios_11 is offline   Reply With Quote
Old 06-30-2019, 02:01 PM   #4
johnwk
 
Drives: 2010 Yaris LB
Join Date: Jan 2019
Location: Rochester, NY
Posts: 14
There's a transmission fluid dipstick. Just check it while the engine is warm and idling, and take note of the color on a paper towel.
johnwk is offline   Reply With Quote
Old 07-07-2019, 01:30 AM   #5
toyotavios_11
 
Drives: Toyota Vios
Join Date: Feb 2013
Location: MY
Posts: 29
fluild level is at correct level.
btw, i have solved the problem by cleaning MAF sensor.
toyotavios_11 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Successful 1ZZ Throttle Body Swap rabbito Performance Modifications 20 03-05-2018 11:03 PM
HELP: Yaris Matic Idle RPM Drop PlainAndrew DIY / Maintenance / Service 4 07-20-2016 04:04 PM
IL: Chicago - Haunted RPM Car/Bike Show - October 20th, 2012 RPM JEFF Great Lakes 0 09-24-2012 04:40 PM
IL: Chicago - Haunted RPM Car/Bike Show - October 20th, 2012 RPM JEFF Mid-Atlantic 0 09-24-2012 03:10 PM
3 Drive Throttle Contoller by NTD Sabretooth Performance Modifications 31 10-07-2010 12:12 PM


All times are GMT -4. The time now is 10:31 PM.




YarisWorld
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.