If my car is flooded,my computer box is ok? - 2003 Chevrolet Venture Passanger

Bad coolant temp sensor--makes ECU think engine is still cold so sends too long injector pulse flooding engine. Very common, and easy fix.

How do you know it floods? Fuel injected vehicles should not over fuel the engine unless an injector/fuel pressure regulator is leaking internally or the computer commands a high injector pulse rate based on sensor information. Does it have spark and fuel pressure when the no start condition presents itself?

Well it is not the catalytic converter nor the computer.Possible idle air control valve. Does it start? If so does it run ok after it starts?

What are the symptoms? Why do you think it's flooding?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

how high was the flooding, does the car crank, lights come on, are all fuses ok? did any blow? have you changed the air filter?

if it cranks try using WD40 or a water dispersant equivelent on your leads and distributer inside and outside the cap. then take to every electrical connection you can with it. if still no start you will need to start dis assembling the interior to see if water got to the computer.

If the car was recently flooded, there really isn't a whole lot of things that woudl cause it to stop moving. I would say to accept what your mechanic says and go ahead and change the computer.

of the Powertrain control module (u call it a computer) got wet inside it is toast as we say, it must be replaced

I would replace the computer box- these can be very pricy! In fact I would recomend replacing the car, you will have nothing but trouble from now on. When a vehicle is submerged, water goes into all kinds of places, and really messes up the whole electrical system. The wires will start to corode from the inside out. The reason for this, is the fact that the insulation on the wire is much like a straw with wire in it. Once the wires get wet in a situation like this, they get wet on the inside also, holding that water, and eating the wire. Every flood car that I have seen, will die a slow and painfull (wallet)death.

possibly. have you changed all your filters? check air filter and throttle body. may be ruined from the water. the throttle body can be cleaned with a fuel injection spray. does your check engine light come on?

IN SOME MODELS THERE ARE BUT EVEN SO SOME TIMES THEY GET DAMAGE THE PRICE ON A COMP.IS APROX 300USDLL AND YOU CAN BUY IT FROM A HONDA DEALER