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01-02-2016, 02:43 PM | #1 |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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Cutoff at low RPM during gentle acceleration - Yaris Verso 1.3 VVTi [SOLVED]
I get short engine cutoff which causes jerky acceleration.
It happens at low RPM, around 1200, on each gear. The best way to present the issue is to try to drive over a curb from complete stop. I have a steep entry to my garage, you can see in the video, where I keep the throttle gently and steadily pressed in: https://www.youtube.com/watch?v=Ll7Rh31lpc8 Other than that the car runs super smooth but there's a problem with fuel economy. Car's display shows 6.5l/100km average but real consumption is 8.5l/100km (calculated from distance driven and fuel tanked). I exchanged Mass Air Flow sensor with my Prius but even with MAF sensor completely disconnected the issue stayed there. I ordered a new front O2 sensor but I get a feeling it will not sort it out. Would anyone be able to help me before I go to Toyota dealership and before I spend too much money there? Last edited by jackmilas; 02-19-2016 at 03:55 AM. Reason: SOLVED |
01-02-2016, 11:21 PM | #2 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Cutoff at low RPM during gentle acceleration - Yaris Verso 1.3 VVTi
Are there any codes?
Can you still drive the car or does this only happen under light throttle application? Sent from my iPod Touch |
01-03-2016, 04:24 AM | #3 | |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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Quote:
I can still drive the car. It happens only at light throttle at around 1200RPM and under a load. I can't reproduce it on neutral. In normal use it just gives me one or two "jumps" during light acceleration from complete stop. 1-2 out of 5 times it won't happen at all. My guess is that ECU cuts the fuel off because some specific sensor values are met. Things that didn't help: - disconnecting MAF sensor - disconnecting both O2 sensors - 98 octane fuel instead of 95 - injector cleaner fluid The car has 140k kms, 15 years old. |
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01-03-2016, 08:38 AM | #4 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Can you see the reading of the throttle position sensor?
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01-03-2016, 11:53 AM | #5 |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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I just checked it. My default (throttle off) position is 11.8% and the engine cutoff happens at around 17%. Gentler or harder acceleration doesn't produce the problem. ------------------- sent from tapatalk |
01-03-2016, 11:54 AM | #6 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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It's the reading steady and smooth all the way through the full range?
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01-03-2016, 02:50 PM | #7 |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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01-03-2016, 03:26 PM | #8 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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have you tried unplugging the TPS?
I can't think of anything else that would cause a light load hesitation at a certain throttle angle like what you're experiencing. |
01-03-2016, 03:44 PM | #9 | |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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Quote:
Regarding temperature question - yes, they read normal. But I forgot to add that the problem occurs after "cold engine" warning light goes out. When the light is on there is no jerky acceleration. As soon as the light disappears, the problem appears. |
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01-04-2016, 08:20 AM | #10 |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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01-03-2016, 03:27 PM | #11 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Both Intake air and Coolant temps are reading normal?
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01-04-2016, 06:42 AM | #12 |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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01-04-2016, 08:45 AM | #13 | |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Quote:
I'm running out of ideas... There is a code set every time you unplug a sensor and run the car right? |
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01-04-2016, 02:52 PM | #14 |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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01-03-2016, 10:09 PM | #15 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Ok check and see if the problem only occurs when the Fuel system is in Open Loop or Closed Loop. Therefore it's a sensor problem somewhere.
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01-04-2016, 03:59 PM | #16 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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It's an automatic I'm assuming from the video...
I'm wondering if it's a transmission problem of some kind. |
01-05-2016, 02:18 AM | #17 | |
Drives: Yaris Verso 1.3 2000 automatic Join Date: Nov 2015
Location: Poland
Posts: 33
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Quote:
- it happens only at a specific throttle position (even with throttle sensor disconnected) - it happens only at low RPM range, around 1200-1400RPM - it happens only when the cold engine warning goes out - it happens at every gear Today I'm replacing front O2 sensor and I'll report back if there has been any change. Some people say that 16 year old car with 140k kms will benefit from replacing O2 sensor in better fuel economy anyway. For some reason I am one of top Yaris Verso fuel consumers despite that I drive very economically: http://www.spritmonitor.de/en/detail/725585.html The car is showing average fuel consumption at 6l/100kms (I reset it at each full tank) and in reality the car burns 8l/100kms. Perhaps both issues have the same root cause? |
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01-05-2016, 08:40 AM | #18 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Yeah a lazy front O2 sensor can cause poor fuel economy. It happened to me.
Have you tried disconnecting the battery and letting the computer reset? I keep thinking it TPS related because I feel like somehow the ECU thinks the engine should be idling and sees a "fast" idle speed and cuts fuel to bring it back to idle. |
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