Technical acceleration problem

[shukito88]

Hello I have a problem with the acceleration of my Fiat 1.4 t jet with gas 120 hp.
When I press the gas pedal smoothly, the car accelerates without a problem.
when I press the pedal all the way down above 2500-3000 rpm there is a stalling.

Did anyone have the same problem as me?
I have replaced the spark plugs with NGK iridium.one coil also replaced due to cracking.No lights on the dashboard.
Thanks in advance to everyone who contributes to this topic.

 

[Mike1alike]

From experience, that sounds like dirty/clogged catalyst. I had that on my Punto. And I can tell you a very cheap and effective way to clean the cat.
You can clean it with vinegar, pouring 1 L through pre-cat lambda sensor hole.
You gotta prepare the field. Take the heat shield down. Take the pre-cat O2 sensor out to make sure it is not stuck and that you won't have any trouble with taking it out while the engine is hot. Put the O2 sensor back and start the engine. Worm up the engine till it reaches working temperature. Stop the engine and take down the pre-cat O2 sensor. Using hose/funnel pour 1 L of vinegar into the cat. Put the O2 sensor on and start the engine. Run the engine about 10 mins and revv it up, 2500~3000 RPM. That's it! The cat will be clean.
As I mentioned, did that to my Punto and the result was engine responding in real time to gas pedal being pressed down, no lag. Before that there was big lag in engine response and especially, as you mentioned, if the gas pedal was being pressed quickly.
P.S. If your engine ECU has the "Phonic wheel learn reset" function, doing a reset might help the engine running its best. You should do that reset any time you do work on timing, take the timing belt down.

 

[shukito88]

Ok thank you i will try

 

[shukito88]

any other opinions on my case?

 

[shukito88]

Fiat Tipo 1.4 it seems like the turbo is turning on and off and turning on and off again this is felt most at 4 5 6 speeds