Your relay could be bad if it won't start below 30. Don't worry about the white smoke, mine smokes like mad when its super cold out, -20 here in MN. Your fuel could be gellin too. I run the white winter bottle of power service in every tank of fuel. You could run that and it would keep ya from gellin. I think that my glow plugs do make a little noise when shes super cold. Nothing is quiet when its below 0.