What is "engine temperature?" Coolant temperature? Ignition timing determines how much cylinder wall is exposed to combustion at maximum heat and pressure (Brake Mean Effective Pressure). This is often 10-15 degrees after top-dead-center. The more retarded the timing is, the later BMEP occurs which also exposes more cylinder wall which ... transfers more heat to the cooling system. You can also affect "engine temperature" (referring to combustion temperature) with ignition timing by over advancing the timing to the point of bringing on spark know, preignition, or detonation. Is this a test question for an auto shop class? ;)