Strange hesitation on 1SZ-FE

[Astronaut]

 
Hello! I bought Yaris 1.0L 1SZ-FE (2004, with 165000 km) and have no fault codes on it

 have some hesitation after fast/sharply pressing the gas pedal (hesitation from idle to 1500-2000 rpm, like if the engine is choking),

but if I press gas smoothly - the engine normally gains speed and power.... also no lack of power from 2000 to 7000 rpm.

what I did:
-new spark plugs (Denco)
-new air filter 
-new motor oil 5w30
-checked MAF and IAT sensor (clean like new)
-cleaned throttle body (was not so dirty)
-cleaned IACV (was clean almost)
-cleaned PCV
-tested TPS
-checked vapor solenoid
-tested camshaft position sensor  
-checked ignition coils (with multimeter)  

p.s. Few days ago I was able to get some data using the ELM327.. everything is fine there too.

The only thing that worries me - is the IAT sensor data. When engige is cold - sensor shows almost real temp.+17C(with real +16C outside), after few kilometers ride: +40...+60C (with still real +16C outside), but when I touch the intake box, where the  IAT is located - it is really warm... is it ok with this data? (when i took it out and measured it - tester shows 2.0 kohms)

I will appreciate any comments on my topic, thanks

[flash22]

check the resistance of the OCV (top left of the timing chain cover)

[Astronaut]

On 9/16/2024 at 5:57 PM, flash22 said:

check the resistance of the OCV (top left of the timing chain cover)

[flash22]

That's in the range, Fuel trims look right so it's not fuel or a vacuum leak

2k ohm is well out of spec for the IAT assuming you have the correct pins - do not buy cheap Chinese junk

[Astronaut]

19 minutes ago, flash22 said:

do not buy cheap Chinese junk

I think it is original from the factory... At least it looks like...

 

Quote

2k ohm is well out of spec

it is not for the 1SZ-FE?

it is not my photo, but I have the same:

 

[flash22]

what were the engine and ait temperatures when that reading was taken?