When I start the car, and put my foot on the gas, the vehicle revs but does not engage and go. I turn off the vehicle, wait a minute then it is ok. Also, I must let the vehicle warm up before attempting to drive it.
Sounds like a possilble plugged catalytic converter. You can try disconnecting the O2 sensor wire and removing the o2 sensor. This will allow exhaust gases to be released and if you just try to move the car a little, but dont drive it, just move it enough to tell if the problem is solved with the O2 sensor removed. If this fixes it, you have a plugged cat. Your local muffler shop can replace the cat for around 150$.
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do you have a transmission problem? if you press on the brake pedel with you left foot and press down far on the gas pedal with your right foot-does the car want to really take off! or does the engine just rev like neutral or slipping with no grip?
I had the same problem with mine about two years ago. The problem drove me nuts for six months. The solution was replacing the purge valve on the intake of the engine. With the purge Valve hung open when refueling raw gas vaper is washed into the engine causing the engine to become flooded after fueling. Hope this helps and good luck.
when vw started to use the computer controlled gearbox system a criticism was the shift was very harsh,to counter this they made it rev slightly before changing.so that you know the system, try this out....without touching the gas.....put it in d and let the car accelerate to its max speed,stop,then use 1/3rd of gas (keep your foot still)and let it do the same...stop,then,if safe,put your foot to the floor,hard, notice when the car changes gear(revs/speed)then if you drive,only using the first1/3rd of the gas,the cars change pattern will alter to suit.......wierd it is.....
It could be the fuel pressure regulator valve is at fault. Maybe its time to have a fuel pressure diagnostic run along with having the injectors flushed. How is the transmission fluid level looking, check it on the transmission dipstick whilst the engine is running (have someone engage 'drive' while both the parking and foot brakes are engaged). If it is brown and low replace the transmission filter and top up with fresh fluid
the gearbox is a computer controlled auto with 4th lock up (O/D) and should, if driven very carefully,change from fluid drive to mechanical drive at about 30 mph.to check transmision carry out the following.
from standstill,put car in drive,no gas,and let the car reach max speed(about 30 ish)then.
from standstill using 1/3 gas pedal (do not move gas foot)let the car accelerate to max speed.
lastly, put car in drive and floor gas pedal(make sure you are alone)then
drive as economically as you can, the gearshift patern will then adjust to your driving style(takes about 50 miles)You will feel the car go from fluid to mechanical drive as a kind of slight drop in revs then ...engage.
assuming you have checked fluid level first of course....
its very important that the throttle body especially around the throttle blade be spotless clean or they will stall every now and then. then progress to refuse to idle at all. take off the rubber air intake pipe from the top of throttle body [has 3 torqes screws] open throtle by hand and look for carbon/grease/soot etc were the throttle sits when closed. clean with toothbrush and some caeb cleaner get all black off and dont forget the blade, both sides and the edges. scrub then rinse with carb cleaner untill shiny.spray some cleaner in the hole that is on top off the body to. that is your idle air controll motor port.put back together.it will be hard to start at first so hold gas pedal half way down untill it starts then slowly [real slow] let foot off untill you are no longer pressing it. put in reverse and let it idle there a few seconds then do the same in drive. that should do it. sometimes it may stall a couple of times when driving dont hold foot on gas just let it die then restart this allows the computer to readjust its idle stratagee
Definitely an electrical problem. Take/Tow your vehicle to an authorized Hyundai dealership and pay the diagnostic fee... they will tell you exactly what the problem is and the cost of parts/labor to fix it... at least this way you'll know what the problem is and what's required to fix it.