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03-18-2010, 01:18 PM | #1 |
Drives: yaris hatch 07 640K original m Join Date: Mar 2007
Location: usa
Posts: 285
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unplugging vvti
my Yaris is running bad still. It might be the cam timing gear telling the ecu to up the idle ..
its racing and generally rough. Do you think the 1.5 would run without the cam vvti..??? I dont know if that might help.. I was thinking of unplugging it... |
03-19-2010, 06:42 AM | #2 |
Drives: yaris 08 sedan Join Date: Oct 2008
Location: Montreal Canada
Posts: 1,286
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Your symptoms sound like a vacuum leak..
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03-19-2010, 10:53 AM | #3 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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You'll get a CEL if you unplug the VVT-i actuator. As the cam will then remain in its fully retarded position all the time, it won't run the best either.
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03-19-2010, 01:52 PM | #4 |
Drives: Scion FRS RS2, ‘21 Crosstrek Join Date: Oct 2008
Location: Chatham, Ontario, Canada
Posts: 1,729
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What's the scan tool say?
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03-19-2010, 09:30 PM | #5 |
Drives: yaris hatch 07 640K original m Join Date: Mar 2007
Location: usa
Posts: 285
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I got the P0011 which is consistent with the Service bulletins on the 07 1.5L
It tells the mechaanic to check the vvti first and if it works replace the cam timing gear which is a handy 450 bucks. Good for the sleazy dealer. I pulled the vvti and put 12v to it and it works but it could be sticking on the return.Its hard to know. It might be the cam gear but the racing rpm would have to be a side effect at least. If the vvti pin sticks on the return the ecu might pump the gas because it thinks you are cruising above 4000 rpm on the hiway. The only time the vvti would extend anyway. I unplugged the vvti and will run for awhile. Yes I got P0016 code but I dont care. It should still work. The old compacts didnt have a vvti anyway. I am getting sick of this buggy. I want out but I dont want to buy now. I wish I could put a brand new corolla engine in it from a few years ago. They were good. And very few people outside of California know these things. In the North they have hardly seen these. |
03-20-2010, 04:09 PM | #6 |
Drives: yaris hatch 07 640K original m Join Date: Mar 2007
Location: usa
Posts: 285
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I got rid of the racing rpm by unplugging the vvti, but the idle is a bit high still ..
but its idling smoother and running ok . Big improvement from before. |
03-22-2010, 08:40 AM | #7 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Is the cam profile without the vvti engaged like that of cars without vvti (at all)?
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03-22-2010, 08:59 AM | #8 | |
Start another Oil Thread!
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how often to you change your oil?
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03-22-2010, 11:13 AM | #9 |
Drives: yaris hatch 07 640K original m Join Date: Mar 2007
Location: usa
Posts: 285
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????????????? plenty
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03-22-2010, 11:35 AM | #10 | |
Start another Oil Thread!
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just checking. the vvti solenoid likes clean oil.
it sounds like you need to find the REAL source of your problems, unplugging stuff doesn't fix anything.
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03-22-2010, 01:10 PM | #11 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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Even if it did work the poor fuel economy that would result but disabaling the VVTI would more than offset the cost of just fixing it over time.
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03-22-2010, 11:38 PM | #12 |
Drives: yaris hatch 07 640K original m Join Date: Mar 2007
Location: usa
Posts: 285
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will get 35 instead of 40 good enough better than 18
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03-23-2010, 09:35 AM | #13 |
Banned
Drives: '10 Yaris5drHB+99 4runner LTD Join Date: Sep 2009
Location: NE
Posts: 672
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disabling VVTI will mostly just kill acceleration and torque. it won't wind up as fast
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03-23-2010, 10:38 AM | #14 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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VVT-i is disabled when the "COOL!" light on your dash is on. It'll run like that. (With the transmission upshifting normally, presumably.)
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