Throttle Lag On DBW - Page 3 - Toyota Yaris Forums

Yaris Hilton · 06-24-2009, 04:22 PM

Quote:

Originally Posted by bronsin

Hmm you said "turn the (ignition?) switch" off. I agree it would stop. But we're talking about taking your foot off the gas pedal and supposedly the fuel is cut off. If I took my foot of the gas of my Yaris it would slow down sure. But it would eventually go about 5 mph, not stop.

Because the ECU is monitoring the engine speed, and as I said above, when it gets down to a preprogrammed speed a little above normal idle (about 800 RPM by my tach), the fuel cuts back on with the engine running at idle power. Those Toyota engineers are pretty smart fellows. They figured we don't want our engines to just die every time we coast. On my automatic, the torque converter stays locked down to the point where the engine cuts back on. It locks (as judged by the RPM and speed staying tightly linked together) even at rather low speeds cruising around town. Mine has "learned" that I like to drive in economy mode.

bronsin · 06-24-2009, 04:54 PM

Quote:

Originally Posted by Tamago

shoulda bought an R bike

Well the surgeing, exploding final drives, wacko servo braking motors, and QC issues in general (and $15,000 plus price tags) put me off one of those. I thought I could sneak in an F650 and get away with it. I was wrong!

puetato89 · 06-24-2009, 05:00 PM

Im glad i found this... info was very helpful but Tamago's avatar is giving me seizures :)

bronsin · 06-24-2009, 05:00 PM

Quote:

Originally Posted by Yaris Hilton

It locks (as judged by the RPM and speed staying tightly linked together) even at rather low speeds cruising around town. Mine has "learned" that I like to drive in economy mode.

How long did it take for the learned behavoir to kick in? My Yaris is 850 miles and two months old. Im pretty happy with the 35-36 mpg its been getting. Considering I only drive it 6 miles to work and back. But maybe theres more?

Tamago · 06-24-2009, 05:01 PM

Quote:

Originally Posted by bronsin

Well the surgeing, exploding final drives, wacko servo braking motors, and QC issues in general (and $15,000 plus price tags) put me off one of those. I thought I could sneak in an F650 and get away with it. I was wrong!

pick up a 90's R bike :)

bronsin · 06-24-2009, 05:03 PM

Quote:

Originally Posted by Tamago

i think this deserves a captain obvious award.

Erm...if you take something out of context yeah you could say that about most anything...

Tamago · 06-24-2009, 05:06 PM

Quote:

Originally Posted by bronsin

Erm...if you take something out of context yeah you could say that about most anything...

award #2 you're on a roll!

i'm glad you can take the joke without getting upset though, that shows character !

bronsin · 06-24-2009, 05:24 PM

Quote:

Originally Posted by Tamago

pick up a 90's R bike :)

I bought a used one of those (R11GS 1996) with 83k miles on it a few years ago. It was SLOW and top heavy. It cost the PO $5000 in (non warranty) repairs. To think I would have sold my soul for one of them when they came out! Just had to get that outta my system!

eric81 · 06-24-2009, 09:34 PM

Quote:

Originally Posted by TheSilkySmooth

ABsolutely NO throttle response problem with my 08 manual. Cant even tell its DBW. Maybe a reflash is needed or available. My car is stock and fast and I didnt screw up my car with Go-slow mods like headers and CAI that just ruin how it runs. I just saw chinocharles 0-60 on youtube and it was not too good. I think im in the 7 sec range easy on good gas. If i figue out how to set up the digital camera I'll make a viddy and U can see if im FOS or not.

Same here, but I have a lot off changes, like CAI, header, muffler, and I even drilled a small hole in the center of my flutter valve to let just a tad more air in. Threw a CEL right away, but it idles the same, and is just a tad quicker on throttle response, so I don't mind. There is this little metal sensor looking thing just inside your throttle body's flutter valve. Maybe make sure it is clean? Also, check that there isn't a sucking sound when the car is idling, near the throttle body, because I noticed mine wasn't tightened down all the way, and after I did tighten it, the sucking noise went away and it ran smoother.

AlexNet0 · 06-24-2009, 09:48 PM

Quote:

Originally Posted by eric81

There is this little metal sensor looking thing just inside your throttle body's flutter valve.

not a sensor, just a useless piece of aluminum molded into the TB gasket (if this is what you are talking about). I cut mine out.

AlexNet0 · 06-24-2009, 09:52 PM

And the lag is definetely present on mine, I just press the pedal sooner, timing is everything, and when you are used to the feel of DFCO (i have no gauges), you can use it to your advantage to gain some MPG's

Jeemee · 06-25-2009, 12:19 AM

I absolutely hate the DBW. It took me a good while to get used to it. Stalled it a lot at first lol. Oh, and my car is basically stock and my 0-60 is 7.85sec, my 0-70 is 10.45, and my 0-80 is 13.32 lol

Yaris Hilton · 06-25-2009, 10:35 AM

Quote:

Originally Posted by bronsin

How long did it take for the learned behavoir to kick in?

Couple of days at most. When I "borrowed" my daughter's 2007 S, which is used to her and her boyfriend driving it a bit more aggressively than I do, it started acting like mine pretty quickly. It was built late in the 2007 model year and has DFCO in Drive just like mine.

talnlnky · 06-25-2009, 12:00 PM

Quote:

Originally Posted by hatchbackkid82

i never notice it, i have a manual, is it more noticeable on the auto

no joke... all you pussies just need to buy REAL cars.... manuals that is.

eric81 · 06-26-2009, 12:36 AM

I now work for Toyota, (just started today), and I test drove a 2009 Yaris, automatic, jolt yellow. I turned the A/C on, and noticed a bit of lag, then turned it off, and can't figure out what you guys are talking about. Maybe there is some, but it is a SMALL engine, so take that into account, and try driving with the a/c off and see if it is different. If problem persists, take it back to the dealership and tell them you think there may be an engine problem. Problem is not there in the manuals, by the way.

Yaris Hilton · 06-26-2009, 02:41 AM

No problem in my automatic, either.

bronsin · 06-26-2009, 08:29 AM

Both my wifes 05 Camry and my 09 Yaris have this problem. Good luck going to the dealer. We tried that at two dealers with the Camry and got no where. The wife feels its something she can live with. My son notices it right away. He dislikes driving it when he goes into the city. Some of his friends volunteered that their family's Toyotas do the same thing. But the general consensus is its something you get used to. As a mechanic I know this is going to play hell with the drivetrain down the line. I guess Consumer Reports had the right idea when they downgraded their "best buy" recommendation for Toyotas.

bronsin · 06-26-2009, 08:49 AM

I make my living fixing things. I know trouble when I see it. The wifes car is five years old and now makes groaning noises in the drive train. I (tried to) warn her to be very gentle accelerating from a stop because of this problem. But just like the Toyota engineers she knows more than me! She takes off with a good shove on the accelerator to make up for the lag. I let the Yaris roll a bit before accelerating and baby it as much as possible. I lobby as much as I can to get rid of that Camry before the bottom falls out of it! Wife loves it. What you gonna do?

06-24-2009, 05:00 PM	#39
puetato89 Just call me Ray, better? View User's Garage Drives: 08 Yaris Join Date: Oct 2008 Location: orlando Posts: 1,056	Im glad i found this... info was very helpful but Tamago's avatar is giving me seizures :) __________________

06-24-2009, 09:52 PM	#47
AlexNet0 View User's Garage Drives: '07 Yaris 3dr Join Date: Nov 2008 Location: Rockland, ME Posts: 1,638	And the lag is definetely present on mine, I just press the pedal sooner, timing is everything, and when you are used to the feel of DFCO (i have no gauges), you can use it to your advantage to gain some MPG's __________________ ---------- MI-YW ----------

06-25-2009, 12:19 AM	#48
Jeemee XBL: Jeemee Ghost View User's Garage Drives: 2008 Yaris LB Join Date: Apr 2009 Location: Central Arkansas Posts: 199	I absolutely hate the DBW. It took me a good while to get used to it. Stalled it a lot at first lol. Oh, and my car is basically stock and my 0-60 is 7.85sec, my 0-70 is 10.45, and my 0-80 is 13.32 lol __________________ _________________________________________________ Nitto Axle-Back--Tanabe DF210s--UR 23mm Rear Sway Bar--Penguin Garage 10mm Hub Spacers

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06-26-2009, 12:36 AM	#51
eric81 View User's Garage Drives: Toyota Salesman Join Date: Nov 2008 Location: Clarksville, IN Posts: 297	I now work for Toyota, (just started today), and I test drove a 2009 Yaris, automatic, jolt yellow. I turned the A/C on, and noticed a bit of lag, then turned it off, and can't figure out what you guys are talking about. Maybe there is some, but it is a SMALL engine, so take that into account, and try driving with the a/c off and see if it is different. If problem persists, take it back to the dealership and tell them you think there may be an engine problem. Problem is not there in the manuals, by the way.

06-26-2009, 02:41 AM	#52
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	No problem in my automatic, either.

06-26-2009, 08:29 AM	#53
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	Both my wifes 05 Camry and my 09 Yaris have this problem. Good luck going to the dealer. We tried that at two dealers with the Camry and got no where. The wife feels its something she can live with. My son notices it right away. He dislikes driving it when he goes into the city. Some of his friends volunteered that their family's Toyotas do the same thing. But the general consensus is its something you get used to. As a mechanic I know this is going to play hell with the drivetrain down the line. I guess Consumer Reports had the right idea when they downgraded their "best buy" recommendation for Toyotas.

06-26-2009, 08:49 AM	#54
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	I make my living fixing things. I know trouble when I see it. The wifes car is five years old and now makes groaning noises in the drive train. I (tried to) warn her to be very gentle accelerating from a stop because of this problem. But just like the Toyota engineers she knows more than me! She takes off with a good shove on the accelerator to make up for the lag. I let the Yaris roll a bit before accelerating and baby it as much as possible. I lobby as much as I can to get rid of that Camry before the bottom falls out of it! Wife loves it. What you gonna do?