NHTSA Complaint #10669875 — 2008 HYUNDAI SONATA

WHEN VEHICLE IS STARTED FROM A COLD START, THERE IS A NOTICEABLE RATTLE COMING FROM ENGINE THAT LASTS ABOUT 3-7 SECONDS. ALSO WHILE ACCELERATING, THE RATTLE IS PERSISTENT WITH THROTTLE INPUT. I WAS TOLD THAT THE PROBLEM IS THE TIMING CHAIN TENSIONER AND THAT THE HYUNDAI SONATAS HAVE DEFECTIVE TIMING CHAIN TENSIONERS. I WENT TO THE HYUNDAI DEALERSHIP AND THEY QUOTED ME $1,100 TO FIX THE PROBLEM AND MADE ME AWARE THAT THERE WAS A TSB BUT NOT A RECALL ON THE PART EVEN THOUGH THERE IS A REVISED TENSIONER. THIS IS A ONGOING ISSUE AND A HAZARD BECAUSE THE CHAIN COULD HAVE TO MUCH SLACK AND CAUSE THE THE TIMING TO BE OFF AND FUTURE DAMAGE FOR THE ENGINE. *TR