Centre Janne Hauhtonen, with his first goal in North America, and right winger Joe Motzko also tallied for the Crunch. Hauhtonen, 27, of Finland, made his AHL debut in the game. Defenceman Ryan Caldwell also chipped in with two assists.
Centre Alex Foster and defenceman Chris Harrington replied for the Marlies before 3,316 fans at Ricoh Coliseum.
The victory was just the second in the past seven games for the Crunch, which improved to 6-15-1, but remained in last place overall in the AHL.
For the Marlies, it was their first regulation loss since Nov. 18, a 5-0 shutout at Manchester, N.H., as Toronto fell to 9-11-3 on the season.
Syracuse netminder Tomas Popperle stopped 23 of 25 shots for the victory. At the other end, Justin Pogge made 31 saves on 34 shots.
Syracuse was 2-for-11 on the power play, while Toronto went 1-for-7 with the man advantage.
Foster scored the only goal of the first period just 29 seconds into the opening frame to spot the Marlies a 1-0 lead.
The teams traded power play markers in the second period, with Hauhtonen scoring at 3:34, while Harrington was in the penalty box for tripping. Harrington made amends less than four minutes later at 9:16, when the rookie blueliner blasted a high slapshot from the point that beat a partially screened Popperle and gave Toronto a 2-1 lead after 40 minutes.
Pineault tied the game at two when he poked a loose puck past Pogge during a goalmouth scramble at 7:38 of third period. The Marlies had a golden opportunity to regain the lead when Crunch forwards Joe Motzko and Ben Simon were called for tripping at 8:23 and 8:26, respectively, but Toronto couldn't get the puck by Popperle.
The Marlies then found themselves down two men for 26 seconds after Boyd Devereaux and Tyson Nash were whistled for tripping at 12:55 and 14:29, respectively.
Syracuse cashed in on the five-on-three advantage when Walser's slapshot from the blueline eluded Pogge.
Motzko added an empty-netter at 19:39.
The Marlies play their third game in three days, and fourth in five days, when the they host the Milwaukee Admirals today at 4 p.m.