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01-21-2014, 07:53 PM | #1 |
Drives: 2007 Toyota Yaris Join Date: Jan 2014
Location: British Columbia
Posts: 6
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Help! The weirdest thing started happening today...
I have a 2007 Yaris. Base model, auto, 2 door, only owner. The last three years not a lot of maintenance has been done. Oil changes and fluids only, sorta thing. Has a small exhaust leak, but it hasn't been there long.
This morning I started her up, and it sounded normal. Then it stalled when I brought the gearshift down past neutral into drive. I started it again, and again everything sounded fine. I feathered the gas as I brought the gearshift down and it went into drive. Drove to work normal. When I got to work I tested it to see if I could replicate it, and I could. I searched on here all day at work, but couldn't find anything really relevant. A coworker suggested it could be the spark plugs, so I changed those myself as well as the air filter. Both were overdue. When I started it back up, the engine sounded fairly "off." Like it wasn't firing right. It immediately stalled when shifting into drive. What could cause this? Thanks in advance! |
01-21-2014, 08:23 PM | #2 |
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A bad torque converter could cause the stall when shifting into drive, but in park or neutral the engine would run perfectly fine. If it is running rough, I would double check that the plugs are the correct ones and are gapped correctly.
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01-22-2014, 12:20 AM | #3 |
Drives: 2007 Toyota Yaris Join Date: Jan 2014
Location: British Columbia
Posts: 6
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I did double check the plugs, and they came pre-gapped to the correct distance. I double checked the gap as well before putting them in.
What I didn't do, but have seen suggested now that I'm doing my panic research, is unplug the battery for a minute to "refresh" the firing rate after changing the plugs. For some reason it wasn't in any walk through I found but it was in the troubleshooting guide. :P Any idea how to check the torque converter? Or is it a straight replacement and hope that's the issue? Thanks! |
01-22-2014, 04:41 AM | #4 | |
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Quote:
For testing the torque converter, the thing that would fail with it causing stalling on start is the one-way-clutch within it. Testing that requires pulling the torque converter out of the tranny.
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01-22-2014, 10:12 AM | #5 | |
Drives: 2007 Toyota Yaris Join Date: Jan 2014
Location: British Columbia
Posts: 6
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Quote:
I showed it to a former mechanic coworker and he thinks it sounds electronic. There are no sounds to indicate an issue, the motor just dies. Like it does't know how high to idle in neutral so it shuts off. |
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01-22-2014, 10:22 AM | #6 | |
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Quote:
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01-22-2014, 11:28 AM | #7 |
Drives: 2007 Toyota Yaris Join Date: Jan 2014
Location: British Columbia
Posts: 6
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Exactly. I can feather the gas to get past neutral without stalling. That works in both directions (reverse to drive, and drive to reverse) however its awkward to do when going from drive to reverse. I am currently just letting it stall when I park.
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01-22-2014, 11:34 AM | #8 |
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OK. For that behavior the service manual points to the ECM, shift lock ECU (lives inside of the shifter) or the Park/Neutral switch (the switch that the shifter cable moves on the tranny) being the culprit. Diagnosis would best be done with the Toyota TechStream tool, as the data that it shows would allow one to narrow the problem down to one of those three devices.
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01-22-2014, 01:41 PM | #9 | |
Drives: 2007 Toyota Yaris Join Date: Jan 2014
Location: British Columbia
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01-22-2014, 02:37 PM | #10 | |
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01-23-2014, 10:57 AM | #11 | |
Drives: 2007 Toyota Yaris Join Date: Jan 2014
Location: British Columbia
Posts: 6
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Quote:
But overall, it was about 3 hours work start to finish and it saved me the $200 part plus install at a shop! Thanks for your help! |
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01-23-2014, 11:13 AM | #12 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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Quote:
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Tags |
plug, shift, spark, stall, transmission |
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