First, a little background…My dad’s 2006 Hyundai Elantra had a thermostat malfunction, causing the radiator to crack and the head to warp. We took care of the thermostat and radiator our selves, but took it to the dealer garage to get the warped head shaved down. While at the shop, the battery was disconnected for a long period of time subsequently causing the computer to reset. While all of the overheating issues we taken care of, we were brought upon another. While driving (particularly uphill) the transmission does want to shift into the next gear and floods the engine with too much gasoline, sometimes causing it to stall. I did a little research on the Internet about what the issue could potentially be. The commonly mentioned things were the purge valve from the Evap canister, the MAF sensor, and throttle position sensor; all which have been tested or replaced. The issue is still present. Any ideas on anything else? The mechanics at the garage say that due to the reset of the computer, all of the adjustments that computer has made for shifting the transmission throughout the past 200,000 miles, have be erased. They told us that the transmission needs to be replaced. They said that they can replace it with a used transmission with a warranty. Our key question is: What is guaranteeing that the computer and the replacement transmission are going to communicate any better? We would just like to have a few more opinions before spending more significant amounts of money.
Thank You in advance for any help or comments!