sometimes the S60 will surge for a moment while driving. Could this be the timming belt
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2003 Volvo S60 Question: car surges
Bret Bodas from RepairPal Test Shop, December 18, 2010, 10:20Master
This is not going to be related to the timing belt. More likely an issue with the transmission or maybe the engine management system. Do you have any warning lights on?
Answer #2derektate December 06, 2012, 16:02Rookie
please check your oil trap..if inop..it will send oil vapor under pressure thu your engine .you will get surges and it will trip a code,,