Cheap hesitation or lag fix

[Rattlesnake]

Originally Posted by laurenth

Sorry for unearthing this old thread,
I have an 04 Yaris 1.0 with the same infuriating problem, I use the double acceleration trick at red lights, first quick tap on the paddle to "wake up" the beast then the second one to actually take off.
was a solution ever found?

Good morning all,
Another unearthing here as Google had served me well! I have exactly this problem and for the life of me cannot solve it. I'm quite mechanically minded and there are no faults stored, but at idle it seems it idles too low and if i press the accelerator down it hiccups then accelerates. I've got an odd feeling the bank 1 lambda sensor or MAP sensor may be faulty, but again no faults are being read... any advice please, TIA

[Compeer]

Originally Posted by Rattlesnake

Good morning all,
Another unearthing here as Google had served me well! I have exactly this problem and for the life of me cannot solve it. I'm quite mechanically minded and there are no faults stored, but at idle it seems it idles too low and if i press the accelerator down it hiccups then accelerates. I've got an odd feeling the bank 1 lambda sensor or MAP sensor may be faulty, but again no faults are being read... any advice please, TIA

Buy a can of intake/carb cleaner and clean the maf sensor carefully with cotton wool and a spray of the cleaner first and see if that helps. Also may as well clean the pcv valve and the throttle body while you are doing it.

MAF sensor vid https://www.youtube.com/watch?v=dFKSEisixfU

throttle body vid https://youtu.be/JcY65GtrJo8?t=41

And pcv valve cleaning vid https://youtu.be/MCYdHHR1dxg

[Rattlesnake]

Thanks pal, tried all these and still the same :(

Originally Posted by Compeer

Buy a can of intake/carb cleaner and clean the maf sensor carefully with cotton wool and a spray of the cleaner first and see if that helps. Also may as well clean the pcv valve and the throttle body while you are doing it.

MAF sensor vid https://www.youtube.com/watch?v=dFKSEisixfU
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throttle body vid https://youtu.be/JcY65GtrJo8?t=41

And pcv valve cleaning vid https://youtu.be/MCYdHHR1dxg

[Compeer]

Originally Posted by Rattlesnake

Thanks pal, tried all these and still the same :(

" Quite common problem - unstable or too low idle speed, sometimes supplemented by power loss at medium speed. There are not definite cause and universal solution, but these engines like cleanness - washing of the throttle body, ISCV, MAF-sensor, PCV valve may have an effect. However, the owners overly fixated on the washing, forgetting that sometimes ISCV, MAF, ignition coil or VVT actuator just have to be changed."

from the engine manual. So next is to clean idle control valve, and throttle body if you didnt do that one already.

After that im afraid you need a friend with the same cay to try swap parts to see which fixes it...Or a really cool scrappy who will let you do that and then buy the parts you need.

If you can find a crashed one, buy them one at a time, have the guy mark them so you can rerturn it if it doesnt help. they are easy to install so could do it at the wreckers shop. Problem is it could be any of those things listed. So you cant tell till you swap them out one at a time ansd see which fixes it.

Start with the chepest on the list and work your way forward. Also the coils can be tested and you can probably look up what they should be at to see if they are weak, would be strange tho that all four are weak.