Throttle Lag On DBW - Toyota Yaris Forums

bronsin · 06-23-2009, 10:54 AM

Im noticing the DBW throttle lag on my 09 Yaris something fierce. Its especially bad in tight parking situations. You push and push on the pedal and nothing happens. When it does kick in the car lurches forward. This cant be good for the drivetrain longterm!
Has anyone come up with a fix for this?

Tamago · 06-23-2009, 10:59 AM

Quote:

Originally Posted by PK198105

search the forum, its been covered about 2000 times

agreed

hatchbackkid82 · 06-23-2009, 11:19 AM

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

Tamago · 06-23-2009, 11:24 AM

Quote:

Originally Posted by hatchbackkid82

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

yes. combine throttle lag with torque converter lag and you'd better push the pedal a FULL second before you want the car to start moving. (found this out at autocross lol)

bronsin · 06-23-2009, 11:37 AM

Theres a construction detour on my trip to work. To get around it I make an illegal left hand turn through heavy traffic. (dont worry its Camden NJ where schoolgirls get raped standing in line for the bus) When that gap opens man you gotta be QUICK! And this car is trying to make up its mind what to do. Its so much easier when I drive my 2001 ECHO!

Tamago · 06-23-2009, 12:10 PM

Quote:

Originally Posted by bronsin

Theres a construction detour on my trip to work. To get around it I make an illegal left hand turn through heavy traffic. (dont worry its Camden NJ where schoolgirls get raped standing in line for the bus) When that gap opens man you gotta be QUICK! And this car is trying to make up its mind what to do. Its so much easier when I drive my 2001 ECHO!

.........which wasn't an automatic ;)

bronsin · 06-23-2009, 12:24 PM

I dont know how people drive a stick with this abortion. It must be difficult to co ordinate the throttle and clutch pedals.

Tamago · 06-23-2009, 12:28 PM

Quote:

Originally Posted by bronsin

I dont know how people drive a stick with this abortion. It must be difficult to co ordinate the throttle and clutch pedals.

i'm not sure what the big deal is, it drives just fine (auto and manual) to me..

marcus · 06-23-2009, 12:35 PM

everytime i see the dbw thread it makes me almost wanna get the blitz throttle controller or sprint booster..almost.. i had someone locally tried it on his automatic he said theres no difference..i guess that depends on how you drive ur car.

Yaris Hilton · 06-23-2009, 03:57 PM

Mine's got nice snappy response. At very light throttle it switches back and forth between DFCO and power just above idle, but has no noticeable lag when throttle's applied. I wonder if some are feeling the DFCO kick in and thinking it's a defect?

bronsin · 06-23-2009, 05:21 PM

Not sure what that is. The problem is: you push on the gas pedal and the car doesnt move until you push harder. Just how hard takes a while to figger out. My wifes 05 Camry is the same way. My 01 ECHO (cable) doesnt do that.

TheSilkySmooth · 06-23-2009, 06:05 PM

Quote:

Originally Posted by bronsin

I dont know how people drive a stick with this abortion. It must be difficult to co ordinate the throttle and clutch pedals.

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.

marcus · 06-23-2009, 06:19 PM

7 seconds..???? he maybe be sleeping while posting this..lolz... stock yaris faster than mitsubishi ralliart or mazda3 gt .....hmmmm

marcus · 06-23-2009, 06:42 PM

Quote:

Originally Posted by PK198105

i know for a fact that the Yaris bone stock with 17lbs wheels wrapped with 195/55/15 will do 10.1sec 0-100km/h. And i have data to back it up , search it or ask Thomas to shoot you the file

im aware of that..people even did 8.5 sec 0-60 mi/hr / 0-97 km/hr but 7 sec?? were talking about the guy who does 7 secs on a stock yaris 0-100km/hr ..must be going down hill..

Yaris Hilton · 06-24-2009, 02:20 AM

Quote:

Originally Posted by bronsin

Not sure what that is. The problem is: you push on the gas pedal and the car doesnt move until you push harder. Just how hard takes a while to figger out. My wifes 05 Camry is the same way. My 01 ECHO (cable) doesnt do that.

DFCO is Deceleration Fuel Cutoff. Whenever you're coasting with the engine turning much above idle speed, the fuel is completely cut off for zero emissions and zero fuel consumption. That of course drags the car down a bit faster than coasting with an idling engine. As you press the gas pedal, there's a slight free play before it recognizes that you want some power, and when the fuel cuts on it's slightly above the idle power level. You'll feel a small surge forward, and when you back off and the fuel cuts off again, there's a sudden slight deceleration. Like I said, if you're cruising slowly on level ground where very little power's needed, you'll feel it surging and dragging as it cuts the fuel on and off. That's normal behavior. The old Echo's ECU was much less sophisticated and didn't have this feature. Automatic Yarises up through about the middle of the 2007 model year didnt have it in Drive, either.

silver_echo · 06-24-2009, 03:06 AM

Quote:

Originally Posted by Yaris Hilton

DFCO is Deceleration Fuel Cutoff. Whenever you're coasting with the engine turning much above idle speed, the fuel is completely cut off for zero emissions and zero fuel consumption. That of course drags the car down a bit faster than coasting with an idling engine. As you press the gas pedal, there's a slight free play before it recognizes that you want some power, and when the fuel cuts on it's slightly above the idle power level. You'll feel a small surge forward, and when you back off and the fuel cuts off again, there's a sudden slight deceleration. Like I said, if you're cruising slowly on level ground where very little power's needed, you'll feel it surging and dragging as it cuts the fuel on and off. That's normal behavior. The old Echo's ECU was much less sophisticated and didn't have this feature. Automatic Yarises up through about the middle of the 2007 model year didnt have it in Drive, either.

really? my 01 5spd has dfco, and i never really notice when it switches... the only reason i am sure that i have dfco is from one of the hypermiling threads... the "shut-off" test...

Yaris Hilton · 06-24-2009, 07:06 AM

I don't think my daughter's '01 with AT did. (At least in "Drive.") But you'll be able to feel it if it does. It's really pretty subtle, not a great lurch. You have to pay attention to it.

Tamago · 06-24-2009, 07:29 AM

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.

i barely hit 6 seconds on boost lol.

06-23-2009, 10:54 AM	#1
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	Throttle Lag On DBW Im noticing the DBW throttle lag on my 09 Yaris something fierce. Its especially bad in tight parking situations. You push and push on the pedal and nothing happens. When it does kick in the car lurches forward. This cant be good for the drivetrain longterm! Has anyone come up with a fix for this?

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06-23-2009, 11:19 AM	#3
hatchbackkid82 Drives: . Join Date: Apr 2007 Location: . Posts: 1,828	i never notice it, i have a manual, is it more noticeable on the auto

06-23-2009, 11:37 AM	#5
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	Theres a construction detour on my trip to work. To get around it I make an illegal left hand turn through heavy traffic. (dont worry its Camden NJ where schoolgirls get raped standing in line for the bus) When that gap opens man you gotta be QUICK! And this car is trying to make up its mind what to do. Its so much easier when I drive my 2001 ECHO!

06-23-2009, 12:24 PM	#7
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	I dont know how people drive a stick with this abortion. It must be difficult to co ordinate the throttle and clutch pedals.

06-23-2009, 12:35 PM	#9
marcus toyota View User's Garage Drives: 2007 Yaris RS Blazed Join Date: Oct 2006 Location: toronto, canada Posts: 3,637	everytime i see the dbw thread it makes me almost wanna get the blitz throttle controller or sprint booster..almost.. i had someone locally tried it on his automatic he said theres no difference..i guess that depends on how you drive ur car.

06-23-2009, 03:57 PM	#10
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Mine's got nice snappy response. At very light throttle it switches back and forth between DFCO and power just above idle, but has no noticeable lag when throttle's applied. I wonder if some are feeling the DFCO kick in and thinking it's a defect?

06-23-2009, 05:21 PM	#11
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	Not sure what that is. The problem is: you push on the gas pedal and the car doesnt move until you push harder. Just how hard takes a while to figger out. My wifes 05 Camry is the same way. My 01 ECHO (cable) doesnt do that.

06-23-2009, 06:19 PM	#13
marcus toyota View User's Garage Drives: 2007 Yaris RS Blazed Join Date: Oct 2006 Location: toronto, canada Posts: 3,637	7 seconds..???? he maybe be sleeping while posting this..lolz... stock yaris faster than mitsubishi ralliart or mazda3 gt .....hmmmm

06-24-2009, 07:06 AM	#17
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	I don't think my daughter's '01 with AT did. (At least in "Drive.") But you'll be able to feel it if it does. It's really pretty subtle, not a great lurch. You have to pay attention to it.