Engine shut off while driving?

I have the same exact issue. I read on multiple kia forums to replace the input and output generation sensors on top of the transmission. 178.00$ later I did so myself and given that it was a very simple fix ( It took about a half hour) it did not fix my problem. Now the car shuts off completely and will not start again. I know it is electrical, just don't know exactly what or where. Hope I saved you some cash. Also this guide can help fix it if this doesn't work.

https://www.2carpros.com/articles/engine-stalls

Please run down this guide and report back.

Car starts then stalls almost immediately

How do I test this? Is there a way other than replacing it?

My next door neighbors wife's 04 Optima dies dieing and after fueling. If she leaves it running, while fueling it will die and starts and dies several times before taking off and acting normal. If she shuts it off while fueling, it starts and dies several times before it gets back to normal. She does hear a vacume release when she opens the fuel cap. After the mess up, the car runs great until she needs fuel again. Then it repeats itself. It's weird, and must not like fresh gas?

Hello,

My 2004 Kia Optima does the same thing. After refueling the engine starts and dies several times. I need to rev the engine and put the car in gear before the engine dies. Once the car is in gear and moving everything is OK.

I talked this over with my mechanic and he thinks its related to the vapor system, fuel pump (or filter) or the gas cap.

The "check engine" light came on about 2 weeks ago and a computer check shows an emissions problem or a gas cap problem.

Not a fuel problem. Runs great up to 3000 rpms. If I press the excelerator to the floor it will run up then cut down to 3000 then back up and back down.

I read the post for engine and fuel troubleshooting but I'm still not sure which my problem could be. It started about two weeks ago with just a hesitation once in a while. Then three days ago it started occassionlly cutting off when idling. At first is acts like it is flooded and is difficult to crank. After starting I can be driving and feel a hesitation then it shuts down. Yesterday it did about 7 times on I-95 interstate and now my check engine light stays lite. Will it damage anything to drive it?

Thank you,
Patricia Baine

Mine is doing the same thing. It started hesitating a few weeks ago. Then killed out altogether on the highway and restarted when I pushed the gas pedal. Since then it either hesitates or dies periodically without warning, usually while driving, sometimes while coming to a stop or turning. Engine light goes on & off. While it was off, Autozone code test showed an electrical issue. Where do we start? Powertrain ground? Does that make sense?

2003 Kia Optima 6 cyl manual
The car will run fine for a while but then for no reason will die as if it is getting no fuel. I have replaced the fuel pump and it ran fine for about a week. Now it is doing the same thing. Either it will die or if truned off just not start. If you wait about a hour it crank right up as if nothing has happend. When I try to crank the car it will turn over but seem as if it is getting no fuel. Do you have any idea what is wrong?

John

I have changed fuel pump and fuel relay did not help

I have the same problem with my 2004 kia optima lx with the 2.4. It will run about ten miles then die and wont start back. Once I let it sit for about 30 min it will start and go a short distance. I have replaced the computer, coil packs, cam sensor, idle sensor, fuel pump, actually to many parts to list. The problem continues without the check engine light coming on. Any help would be greatly appreciated.

Engine starts then shuts off a few seconds later. Turn off ignition, restart, same shuts off again.

Starting the car in the mornings, cold or hot, starts right up, idle begins to fluctuate between 750 and 3000 RPM. Turning the key off and right back on four or five times, the idle settles down to 750. Placing the car in gear, drive 300 feet or so and it dies. Will not start for sometimes five minutes, sometimes an our. Get back in, turn the key and starts, may run for three or four days, 2-3000 miles and then it dies. When it dies, there is a smell of bad gas, sweet smell. Acts like it is vapor locking, which fuel injections is not supposed to do. Have replace fuel filter, throttle position sensor, engine coil, mass air flow sensor, spark plugs and wires. This shutting off also can occur while driving at 70 miles per hour. Most times you can tell when it will die, as it hesitates when accelerating, you better find someplace to pull over. I am afraid it will stall and someone get hit. The check engine light is on and reading the codes, says the coolant sensor has high voltage. I have replaced the sensor, stays off for an week or so, then comes back with same reading.

When I start the car cold it starts okay but weak as if it is going to shut off, but then the rpm goes up regular. Then when I drive the car fifteen minutes time I shut the car off and come back fifteen minutes later it starts then it shuts off. I start it again and it want to shut down but I give it gas a it stay on. I try the form cleaning, I change the mass flow senor, I change idle position senor, I change two more sensors that have to do with the throttle. Do you have any idea why this is happening?