Ok guys, here is the problem I'm having. I have a 2009 Santa Fe, SE, 2WD, 3.3L V6 with 30,000 miles on it. I change the oil every 3k miles even though the manual says 7.5k and have replaced the cabin air filter as the manual calls every 10k miles. I do all the maintenance that is required by my manual to the T.
The other we were driving home and it was very hot, about 100 F. We had the a/c cranked all the way and we got off the interstate the motor just died. I plopped the car in neutral and turned the key and it fired right up. I thought maybe it was just a one off fluke and would monitor it for a while to see if it does it again. Yesterday I was backing out of a driving after driving for about 30 miles or so and the engine died again, i plopped it in neutral and it started right up. Both times there were no check engine lights or nothing on the dash. I brought it to the dealer that I bought the car from and they said there were no codes when they did a scan so they went ahead and looked for other things that could be wrong. They noticed that the throttle body had alot of carbon build up in it and said that this could cause the flap in the throttle body from opening or the sensor in the throttle body could be going defective but they couldn't replace the sensor without a code under warranty. The guy also said that excess carbon build up was normal on Hyundai's and this was routine maintenance and they wouldn't fix it for free as I should have it cleaned every 15k miles. After arguing back and forth they decided to fix it for free. Here are a few questions I have and was hoping to get answered:
1). What would cause the motor to just shut off without any check engine lights or codes?
2). Could excess carbon build up cause the motor to just turn off?
3). Do all hyundai's with the 3.3 get carbon build up like this after 30k miles? Does everyone else clean their throttle body every 15k miles like the dealer said we should do?
4). Would any of you call this regular maintenance when it's not in the manual?
I wrote Hyundai Motors an email asking them if this correct but I figured I would ask the community as well. Any feedback would be greatly appreciated.