A combustor system for a gas turbine engine, the combustor system comprising: a combustor case ; a combustor liner disposed within the combustor case and defining a main combustion chamber ; a dome defining an upstream end of the main combustion chamber; and at least one torch injector attached to the dome of the main combustion chamber configured to inject combustion gases into the main combustion chamber, each torch injector comprising: a torch injector housing defining and surrounding a torch combustion chamber configured to house a combustion reaction; an outlet passage defined by the torch injector housing, wherein the outlet passage directly fluidly connects the torch combustion chamber to the main combustion chamber; an electrothermal ignition source extending at least partially into the torch combustion chamber; and a fuel injector configured to inject fuel into the torch combustion chamber to at least partially impinge on the electrothermal ignition source and generate the combustion gases; characterized in that the torch injector is configured to inject unignited fuel into the main combustion chamber ; and in that the combustor system does not include fuel injectors other than the at least one torch injector . a combustor case ; a combustor liner disposed within the combustor case and defining a main combustion chamber ; a dome defining an upstream end of the main combustion chamber; and at least one torch injector attached to the dome of the main combustion chamber configured to inject combustion gases into the main combustion chamber, each torch injector comprising: a torch injector housing defining and surrounding a torch combustion chamber configured to house a combustion reaction; an outlet passage defined by the torch injector housing, wherein the outlet passage directly fluidly connects the torch combustion chamber to the main combustion chamber; an electrothermal ignition source extending at least partially into the torch combustion chamber; and a fuel injector configured to inject fuel into the torch combustion chamber to at least partially impinge on the electrothermal ignition source and generate the combustion gases; characterized in that the torch injector is configured to inject unignited fuel into the main combustion chamber ; and in that the combustor system does not include fuel injectors other than the at least one torch injector . a torch injector housing defining and surrounding a torch combustion chamber configured to house a combustion reaction; an outlet passage defined by the torch injector housing, wherein the outlet passage directly fluidly connects the torch combustion chamber to the main combustion chamber; an electrothermal ignition source extending at least partially into the torch combustion chamber; and a fuel injector configured to inject fuel into the torch combustion chamber to at least partially impinge on the electrothermal ignition source and generate the combustion gases; characterized in that the torch injector is configured to inject unignited fuel into the main combustion chamber ; and in that the combustor system does not include fuel injectors other than the at least one torch injector . <EOS>