Motor blows at 25 mph

USMC7280

MEMBER
2002 HYUNDAI SONATA
77,623 MILES

4cyl engine. Motor blew at 25 mph. Dealer claims it jumped timing for unknown reasons. Timing replaced at 60,000 per dealer request. Replaced with genuine hyundai parts and only goes 17,623 miles? If they damaged the crank sensor when replacing it the first time would that effect it? Have heard that tensioner belt pulley must be replaced when changing the timing belt is that true?
no rough idling, no missfiring, no excessive smoke, no rattles, no skipping, no check engine light on. Nothing, car was running perfectly and BOOM. Please advise, hard enough being disabed and on social security making ends meet now have to deal with a dealer

1 Reply

SATURNTECH9

MECHANIC
30,869 POSTS

The only two things that come to mind for a belt that new jumping timing suddenly is oil leaked into the belt area causing it to jump. Or the belt tenisor failed iam not sure if the belt tenisor has to be replaced when doing the belt at only 60,000 miles. It would be a good idea to replace it when doing the belt though.I know gm has a 12 month/12,000 mile warranty on most parts and labor repairs. Not sure what they offer only have worked at gm dealers. Also a damaged crank sensor wouldnt cause the timing belt to jump.I would think if it was damaged it would have given you trouble a long time ago.