2003 subaru baja with new engine won't start

try the crank speed/position sensor as this controls the engine revs as well as other things

P0113 ? intake air temperature (IAT) sensor high output

possible cause: bad IAT sensor, wiring, bad ground wire, ECM bad

Are you losing coolant?

You can buy spray cans of disinfectant, Wurth sell it aas doo motor factors. with engine running and ac on with fan on full empty whole can in the intake vent under screen where the wipers are.

Hello, your vehicle may not be equipped with a serviceable fuel filter, Subaru started to use lifetime in-tank fuel filters in 2004. But, there is an easy way to check, start by opening your hood and walking over the drivers' side front fender. I don't know how much you know about cars so it's easier for me to treat all problems as if the owner knows nothing, If this is not true for you please forgive me. If you look at the engine the first item you will most likely notice is the intake manifold which looks like a grey/silver aluminum 4 legged spider like thing. If you look at the side closest to you, there will be 3 metal tubes/lines coming up from in between the 2 legs of the intake. They will turn 90 degrees towards you and connect into three rubber lines that curve around and point towards the drivers' seat. The fuel filter will be there receiving the upper most line while the other 2 bypass it. It will be almost the size of a can of soup and will be either silver or black. If you don't have one there will be blue sleeves on the the line that goes to a small, almost flying saucer looking fuel pressure regulator which is black. I hope this info helps...(subyguru)...

Check your thermostat is working properly and maybe even flush and replace coolant. Good luck and have a great day.

make sure alignment
marks of both cams are at 12 o'clock crank alignment is also at 12,use the line on the reluctor of the crank gear as your mark ,match it with the mark on on the oil pump housing where the crank sensor is,,ok all marks at noon that's what i should have said idon't want to confuse you good luck

Hello, this picture is for the single over head cam engine...
And this picture is for the dual over head cam turbo engine...

check for codes and check for fuel, spark and the crank sensor for signal.

is there a problem using e10 ethonal in a subaru impreza wrx 2003