3126B Manifold Temp different on 2 engines

Hi all , Hope someone can help me with this ,i have 2 x 3126B ,2003 Mdl , On start up the port & stb eng manifold temp is 15-17 deg , the stb temp will go up to 37 deg them as engine warms up go's to 17 to 20 ish deg , the stb stays at the low temp 15 to 17 deg , it also is smokey at start up ?? witch one is doing the correct warm up ?? Thanks Steve.