Engine start system

An engine starting system for restarting an engine after engine stop by injecting fuel into a cylinder which is initially on an expansion stroke and causing ignition and combustion in the cylinder includes throttle valves (17) constituting an intake air quantity regulator and an electronic control unit (ECU) constituting a controller. The ECU sets the throttle valves at a specific opening for a for a specific period of time (t1,t2) during execution of engine stop operation to increase forces opposing movements toward top dead centers of pistons in a cylinder which is initially on a compression stroke (#3 cylinder) and in the cylinder which is initially on the expansion stroke (#1 cylinder) at engine stop.