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04-09-2013, 07:30 PM | #1 |
Drives: 2006 Yaris Join Date: Feb 2013
Location: New Zealand
Posts: 12
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Issue when taking off from standstill - jerking/lurching
Car is a 2006 Toyota Yaris 3DR hatchback. 4SP Automatic transmission. About 70,000 mi (110,000 km) on the odometer.
Issue I have is very peculiar. When the car is at a standstill and I accelerate, the car will slowly start moving, then it's almost like it drops a gear and floors it. This causes the car to lurch forward. At first I thought it was me not being used to the throttle, but no matter how hard I try I can't get it to take off smoothly. It seems intermittent. Out of ever 10 take offs from standstill, it will probably do it 5-6 times. Once you're moving, the gearbox shifts smoothly at all other speeds. I've owned the car for almost 1000 mi (1600 km) and it hasn't gotten any worse. No check engine light or any warnings indicated on dash. I have scanned for errors via the OBD port and not found any DTCs stored. Any ideas what this may be? I know this is like asking how long is a piece of string so any help is appreciated. |
04-09-2013, 08:57 PM | #2 |
ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Have you checked the AT fluid level and checked to see if the fluid smells/looks burnt?
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04-10-2013, 01:38 AM | #3 |
Drives: 2006 Yaris Join Date: Feb 2013
Location: New Zealand
Posts: 12
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Hi,
I have not done this -- can you tell me how I can do this? Perhaps direct me to a workshop manual or similar? |
04-10-2013, 06:26 AM | #4 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Quote:
http://www.yarisworld.com/forums/sho...53&postcount=8
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04-10-2013, 01:45 PM | #5 |
Drives: 08Yaris2D, 88LandCruiser. Join Date: Jan 2013
Location: Alameda,Ca.
Posts: 476
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From a start your in the lowest gear. I'm guessing it's in the accel pedal rheostat, maybe a little dirt/wear.
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04-10-2013, 01:56 PM | #6 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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There are two redundant circuits on the accelerator pedal, so if one had a dead spot the ECM would detect the difference and would throw a DTC.
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04-11-2013, 05:04 AM | #7 |
Drives: 2006 Yaris Join Date: Feb 2013
Location: New Zealand
Posts: 12
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Hi guys,
I have checked the disptick for the transmission fluid. It definitely doesn't smell burnt. It is a reddish-pink color. It seems slightly overfilled though! But I need to check this again in the morning when there is proper light. I have taken a video of this -- http://www.youtube.com/watch?v=k9XZo...ature=youtu.be You can see clearly. When I am stopped and I step on teh throttle, the revs climb smoothly and the car accelerates smoothly until about 1800 RPM. Then, its like I lifted off the throttle (although I didn't!) and revs drop back down to about 1100 and then it accelerates smoothly. You can see clearly in this video. So points of action 1. Check the transmission fluid dipstick again during dalyight 2. Capture live data thru the OBD and graph it to see what the injectors/throttle position sensor is doing at that time. |
04-14-2013, 06:22 PM | #8 |
Drives: 2006 Yaris Join Date: Feb 2013
Location: New Zealand
Posts: 12
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Okay so I've inspected the live data stream, specifally engine speed, throttle position & fuel flow in CC/min.
When I step on the gas, the engine revs start to rise until they hit about 1200, then there is a sharp drop back down to 800 or so (while the car jerks, kind of like I dropped a gear and dumped the clutch in a M/T), after which point the car accelerates smoothly. During this time, I saw that the fuel flow rate and the throttle position do not change; they are on a constant upward curve (as one would expect). Anyone got any more thoughts on what this may be? |
04-14-2013, 06:52 PM | #9 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Quote:
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04-14-2013, 07:05 PM | #10 |
Drives: 2006 Yaris Join Date: Feb 2013
Location: New Zealand
Posts: 12
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At only 70,000? What kind of abuse could cause this? Or is it likely to just be a defective unit?
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04-14-2013, 07:24 PM | #11 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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The only other Yaris that I have ever heard of with a failed torque converter was one that was totaled in a crash and then rebuilt. The second owner experienced the failed converter shortly after taking ownership.
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03-30-2021, 02:46 PM | #12 |
Drives: Yaris 2019 Join Date: Mar 2021
Location: South dakota
Posts: 2
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Hello there,
I was searching on the net for possible fixes to my car and I stumbled on this post. This is a 99% the same problem I have with my 2019. Car shudders when coasting. Car shakes while on stop light while on drive. Shaking stops when put in neutral. Car jerks when starting from a stop. Jerking is more like a delay in the power transmission. Jerk is extremely noticeable and delayed when on incline. Also dangerous when making a yielding left turn. No check engine light. Car has 51k. Powertrain warranty included torque converter. I have had problems with the dealership bc they weren’t honest with the warranty until I pulled out the warranty book. How did you fix your issue? How should I approach this problem? |
05-05-2021, 02:51 PM | #13 |
Oldie
Drives: 2012 yaris sedan Join Date: Apr 2021
Location: Northern california
Posts: 10
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Have you figured out the problem OP?
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05-05-2021, 04:11 PM | #14 |
Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008
Location: Georgetown, Ontario, Canada
Posts: 5,740
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8yr old thread and OP has not logged on in 3yrs. Don't hold your breath.
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