Misfire at rav

Good day
Toyota Camry 2009 4 cylinder 2.4l

It have dead misfire at accelration between 1 and 2 rpm and then it will be ok from 2 rpm

I do cylinder drop test all look ok
I remove air filter it is ok
I remove airfuel sensor and it stil misfire

It have no misfire counter

I remove spark and clean it it look normal

I can not cheack fuel pump presser due no serves port to hook my geage

At ideal it look ok jest when i rev it
Thes come after havey rain
Iclean mas by break clean
Mas air flow at rpm670 it read 2.1 gm/s at 1000rpm 4.78 at 3600 14.8 gm/s at4400 20gm/s

At 670rpm my fuel term long l19.5 short 8
Alt 2000 rpm long 19.5 short 7.8
At 3600 long 19.5 short 10.1
At 4400 long 19.5 short 0

Af oxygine sensor is read
At ideal -0.02mv 3.26v 1.007 times

At2400rpm -0.12mv 3.12v .991 times

At 4200 -0.11mv 3.11v .965 times


Plz any help
I have autel scoop and low amp clamp

Hi sir,

Do you have also MAP readings? This readings can tell us whether there is or there is not a vacuum leak

MAF reading 2.1 g/s at idle is a little bit low (should be at 2.8 or something). This depends on rpm.

670 rpm are also low
for a 4 cylinders engine (which also tell us there is a vacuum leak in an engine with MAF). Do you know desired rpm?

Fuel trims are telling you PCM is always adding fuel. I would find the way to measure fuel pressure.

Also, if fuel pressure regulator has a vacuum hose, unplug it. This vacuum line decreases fuel pressure at low rpm.

That way you put maximum pressure in fuel system at idle or low rpm

No map on it
Fuel regltor with no hose on it

MAf should be reading much higher maybe around 50 gs at 4400 rpm

I suggest you the following.

Take the car for a spin. At wot, look for calc. load and oxygen sensor voltage in the scanner.

O2 sensor should be rich at wot all the time and and calc. load should be more than 85%

In order to have enough time to observe data, a climb hill would be better.

Let us know your results

Fix
Clean the injector

Interesting because of the heavy rain symptom I was leaning towards a shorted ignition secondary issue