If the engine is excessively noisy on startup (after the engine has been off for several hours) and the noise lasts more than four or five seconds, turn off the engine and check for correct engine oil level. If the oil level is correct, the noise may be caused by the timing chain tensioner. Kia released an updated timing chain tensioner to solve this problem.Google+
Car Problem Reports
Kia Sorento Updated Timing Chain Tensioner to Correct Noise on Startup
Kia Sorento Problem
Engines Affected: 3.3L V6, 3.8L V6
Average Mileage: 44,325 mi (10,800 mi - 78,000 mi)
Whine on start up and when engine revs.
noisey on start up after setting 1-2 hours just bought vehicle. have to take back to dealer.
Visitor, 2008 Kia Sorento, 3.3L V6, 44,175 mi
on start up of a cold engine, it makes a horrific noise and if setting for 2 hrs on startup...kinda scary???