2000 Echo bogs down when trying to accelerate quickly

[julioagimenez]

My friend has a 2000 w 120k+ mi. It starts and idles well enough, it also accelerates smoothly when accelerating slowly. The transmition shifts fine, and it has no problem maintaining highway speeds. The problem comes in when trying to accelerate quickly. With the petal pushed to the floor it bogs down and looses speed.

If anyone has encountered this, or knows what it is being caused by, your help would be greatly appreciated.

[vic benson]

Has he checked all the usual stuff.....Air Cleaner.......Throttle Body........Air mass sensor............Plugs........all of the vaccume lines???

Vic

[julioagimenez]

Yessir, i checked it all myself. All vacuum lines seem to be hooked and intact, the throttle body and mass air sensor are clean and the tune up was done several months ago. It is dropping codes p0171 and p0110.

[vic benson]

how about the fuel pump??

[julioagimenez]

That i did not check... what would be the best way of going about that?

[vic benson]

If you go to "You Tube" and punch in "Toyota Echo Fuel Pump" there was a very descriptive demonstration on how to replace a fuel pump. You will find it very helpful!!!

[vic benson]

Did this problem start after the tune up?? Could it be the coils??

[julioagimenez]

The coils should drop a misfire code and i am not getting that.

[Solace87]

Is it jerky or does it bog down smoothly, funny thing to say i know but knowing that info can help diagnose it

[julioagimenez]

it bogs down smoothly

[Stevo_Echohb05]

P0171 = System Too Lean
P0110 = Intake Air Temp Circuit Malf.

[julioagimenez]

i feel that the two things may not be linked. i cleared the codes and drove it. The codes did not come back until the next day, but the problem was still there