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New Yaris Problem - A Lemon?

81 messages,  Last post on Sep 08, 2009 at 6:57 AM

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#77 of 81 Re: Yaris Problem - A Lemon? [liam3] _NO_ The Truth! [podred] [liam3] by 63pont Sep 07, 2009 (11:33 am)
Replying to: liam3 (May 12, 2008 3:47 pm) You describe the problem very well. It appears we have a Toyota P/R person telling us we don't know how to drive etc. I have a 07 Yaris, the problem began after a year and about 12,000 miles. (Nothing to do with the cold engine start etc which is normal, or the automatic downshift on a steep hill that Honda also has). This is a serging problem that takes place going on the highway at 30/50 MPH and it begins a slight downhill grade, and may even do it when you cannot notice the grade. It will drop 200RPM then serg up400 RPM to recover then drop again in a continual rythem. I noticed a harmonic rythem at higher speeds and at first thought it was a tire or bearing but have since realized it is the serging at high RPM when the engine is working and you can't feel the slight RPM change. One Service manager blamed me for the way I drove, they test drove it and said nothing wrong..I insisted the service manager take it out and I jumped in with him..The car was serging...he blamed the computer saying it was used to my driving...He insised I come with him for a ride in their service Yaris...same mileage(NOCRUISE CONTROL) IT WAS WORSE than my car...he admitted he was not moving his foot on the auxilerator....they said the set the computer back to factory specks, did not help...he admitted I was not the first complaint they had,.....my gas mileage has dropped by at least 15%.....different garage,service manager was up front and had experienced it....he will try to solve it...I suspect it has something to do with the drive by wire system Yaris uses........ Replies to this message: thecatman (Sep 08, 2009 4:34 am) phllbit (Sep 08, 2009 6:57 am)
#78 of 81 Re: Yaris Problem - A Lemon? [liam3] _NO_ The Truth! [podred] [liam3] [63pont] by thecatman Sep 08, 2009 (4:34 am)
Replying to: 63pont (Sep 07, 2009 11:33 am) I took it in and the drove it. Basicly the person who sold me the car said he felt what I was talking about but the problem is between the gears. The computer isn't sure which one it should go in, so sometimes it stays in low and others times it doesn't.   I told him that doesn't make sense, and while it feels like it's in lower gear, I don't believe that's the case. When the car is doing 50 and dragging, I can shift from D to 3 and you can feel it downshift. When it upshift it goes back to normal. But if it was already in 3 gear it wouldn't do that, and I'm going to fast for it to be in 2nd.   It seems the problem has gotten better as colder weather sets in, although this morning it was the worst it's been in a week. It's not really bad, just annoying when you want to coast and feel the car holding back and slowing you down from time to time. Maybe after it breaks in this will improve.   Other than that I have no problems with the car. The after-market cruise works fine, perhaps not as well as the factory, but I've taken it on a 2 hour trip without a problem. When I talked to the dealer he said I won't have the same problem mentioned, so I hope he's right.   That's the update on my car at 2,500 miles.
#79 of 81 engine dragging... by dake Sep 08, 2009 (4:59 am)
The automatic has an overdrive (I don't think it's even called that, it's not quite a "5th" gear, but it's there). If you pay close attention while accelerating to highway speeds you'll feel it do a final shift. You can test it by manually up-shifting the gear selector. Go from 2nd to 3rd then over to "D" while you accelerate onto the highway. You'll feel the shift from 3 to "D" and then you'll feel another shift after that initial one. The downside to that is, it's geared in such a way that it falls out of it easily. A slight rise in road grade or the difference in drag between changing lanes from behind another car into open air will cause it to come down to regular D and it will tend to stay there beyond say the crest of a hill before going back to high D.   Its goal is better highway fuel economy, but the problem is it's impractical to drive the vehicle in such a way as to use it - heck the car can't drive itself in such a way. The only way to keep it from falling out of high D is to accept minor decreases in speed. We as humans, and of course the cruise control, will typically adjust to maintain a specific speed therefore forcing the transmission to adjust.   I can't really call it a design "flaw", but it's certainly not the best execution. It can be made to work for you, but you have to be feather-light on the gas pedal and be willing to sacrifice cruise speed to keep it in that high D. Replies to this message: thecatman (Sep 08, 2009 5:18 am)
#80 of 81 Re: engine dragging... [dake] by thecatman Sep 08, 2009 (5:18 am)
Replying to: dake (Sep 08, 2009 4:59 am) Thanks Dake! This makes sense. I'm going to give it a try to see what you mean. I hadn't heard about the higher "D", but it makes sense because on my trip I appeared to be getting real good MPG, mostly just going 60mph for a couple of hours using the cruise. Since this would keep it in the higher gear, it makes sense.
#81 of 81 Re: Yaris Problem - A Lemon? [liam3] _NO_ The Truth! [podred] [liam3] [63pont] by phllbit Sep 08, 2009 (6:57 am)
Replying to: 63pont (Sep 07, 2009 11:33 am) I agree the electronic throttle system is very sensitive and if it is out of adjustment or not working properly then you will get all sorts of problems. Mine is not too bad, it tends to downshift to 1st gear when going slow around a corner which can be disconcerting but I have got used to it and just take it a little easier.   But all the other crap I have been having from this dealer is not going to be accepted. Stay tuned for further developments.

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