I don't understand what you are saying. What is "in datastream i have STFT 99% at time"?

 

scan tool show me short term fuel trim 99%

 

That means that the injector pulse width is 99% of maximum. That explains why it is getting too much fuel but now you must determine why the ECU thinks it needs that much fuel. Two likely causes are:

1. Temp sensor reads much colder than actual
2. Defective mass air flow sensor

The simplest of these to check would be the temp sensor. Disconnect it completely and attempt to start the engine.

Note: If the engine does not start normally then turn off ignition. Hold accelerator to floor. Crank engine and slowly release the pedal while cranking.

You never answered my question about when this poroblem occured. Did it fail to start hot or cold suddenly or did it stall in traffic? This is an important key to the diagnosis.

 

Hi Cruzian. Problem start, when i going home from work. Car runs fine and when i stop in traffic lights, the engine stall. I start the engine again, idle was fine, but i can't accelerate. Max is 2500 RPM and when i reach this point, the engine stall. I did twice and after that i can't start the engine anymore. I will try ECT sensor today. Thanks

 

It's not the temp sensor. Check the mass air flow sensor. It probably encountered a piece of debris and fried the anemometer probe. Try running engine with the MAF disconnected.

ECT sensor is for the transmission? Why the ECT?

There should only be a few key sensors needed to allow the engine to run such as crank position sensor and MAF. If not, that's a very poor design.

 

I think ECT mean Engine Coolant Temperature. It's wrong? Or it's the same sensor, which you mean(temp sensor)

 

Yes, forget the ECT. The engine won't stall out because of that sensor. Look at the MAF instead.

 

OK. Some updates. With new temp and MAF sensor I can start engine. Idle looks good but i can get max. 2000 RPM and then engine stall. I used aftermarket sensors. May I used dealer's MAF sensor?!?!?! Or what do You think? Thanks