Dumping fuel flooding 4 cly. out - 1996 Lexus LS 400

Replace the temperature sending unit/temp sensor. With it not working properly, the computer is keeping it in cold start mode and still dumping fuel in after warmed up, causing a flooding condition.

Could be a faulty o2 sensor causing it to get an inaccurate reading to the computer making it dump more fuel

no year, and not jeep stated much less an engine option, wow.
called stalling there are 50 cause (i have the list)

get i tune up this decade? or at 60k miles, (critical it is)
every 60k not just 1st.

ever do that?
if you can save the stall with fast right foot action that checks off
1st failure, lost of 12vdc power to EFI and spark,
does that work?
leaving these answers, Spark engines.
bad spark x cylinder count, not stated, 4 , 6 or 8 cly.
bad fueling (too little, or flooding)
bad engine (50 reasons)

Most likely is the temperature sending unit/sensor. Nobody ever thinks about how it works. When engine is started, and cold, the temp sensor tells the computer to put the engine into cold start mode, putting more fuel into the engine and to a bit higher idle. Once it warms up to operating temp, said sensor tells the computer to turn off cold start mode and it stops dumping excess fuel in. If the sensor puts it in cold start mode, malfunctions and doesn't take it off cold start mode, it's still dumping excess fuel in and flooding the engine. Sometimes a re-start will reset the computer, but not always. Makes sense now, doesn't it. Find the temp sensor and replace it like you did all the others.

Try to check the emission components. Check also the MAF and the throttle position sensor.

look at the fuel pressure regulator pull off the vacuum line while running and see if fuel drips out of the fitting

Check the fuel injector..some time they give the same code like misfire..if it is good, than go ahead and check the wiring harness if there is a signal coming from it..if no signal..then follow the wire back to the source to see if there a short or open...good luck

You have a bad injector or a defective throttle control switch. You can test the throttle switch if you have a ohm meter, if you do get back to me and I will tell you how to test it.

Try flooring the gas pedal when you go to start it (but quickly remove your foot on the pedal when the car starts).

That is just to clear the flooding (it's called clear flood mode when the accelerator is floored before the engine is on).

You need to replace your Engine Coolant Temp sensor. It is dumping too much fuel in your engine and not allowing it to start. The stock one is plastic and cracks. It then sends a signal to the PCM that the engine is -40F (that's negative 40 degrees F as in below zero). The PCM then tries to warm up the car by dumping fuel in it but since it isn't that cold it causes a problem.

Get a new brass one from AutoZone or the like and replace it. It's a 10 minute job and takes a 13MM deep well socket.

When trying to start an engine that you feel might be "flooded" , hold gas pedal down to the floor while cranking . This will stop the injectors from triggering. You might have to remove spark plugs to clean and dry out from fuel. Hope this helps