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no year car? wow...
no country. sold world over, with 5 more more engines,
miles on car?
miles since last full tuneup.?
when was it last a reliable daily driver? last month or year?
my guess( useless) is it needs a tuneup,
ever heard of spark plugs? fresh and new??
a tuneup makes 99% of all engines start in cold weather,
Ill assume it cranks robustly but I can't hear it?
200rpm is fast robust starter 50 is no good. 50 RPM
a mechanic hears that, and just knows, in 1 nano second.
new battery means nothing, what was CCA spec.
you mech looks outside, and sees Nunavut Tavern, and he's running summer fuel, or it so cold the battery is weak. or there is water in the fuel, or or or, dang. or he's in Dallas, and he forgot to do the 60k mile service. oops. (aka, a tuneup) today , it wont start, he look and finds spark gone , he fixes that or he finds the engine is flooding, due to bad sparkplugs.(12year old plugs) or fuel pressure is at 60 and the regulator is bad. or the sparks are dry and finds the fuel pressure a 5psi, and a corroded connector 3 feet behind the fuel tank. (can go on for 2 days stop)
could be fuel pump,check for fuel see if fuel pump supplying fuel and you are getting spark.make sure ignition timing is correct and the idle speed setting correct check the under hood emissions information label.also check engine make sure engine not over heating check cooling fan clutch see if cooling fan clutch is okay by turning it by hand if engine is hot cooling fan should have resistance if engine is hot, if cooling fan feel loose no resistance the fan clutch is bad.
Did you replace the plugs with the same plugs (Manufacturer) as the plugs you had in there. Some cars are very picky with plugs. ie: some Japanese cars will only run well with NGK Spark Plugs. Try to use only what Subaru recommends in your engine for the best performance.
For something like this it could be a number of differnet things. I suggest that the next time your vehicle cuts out on you check for sufficent ignition spark. you can do this by removing a spark plug wire from a spark plug and holding it close to a ground on the engine (or if your brave enough you can grab it lol). and if you do not have spark then i would suggest to replace the ignition coil. if you do have spark then i would check for proper fuel pressure.
Check if fuel or spark problem,..all engines need both to run...use starting fluid in air intake ,..if it runs very shortly-fuel pmp?,,ck for spark at spark plug,work your way back..also ck timing belt-intact? Kev-MN