My '93 Subaru Legacy GT revs to 2000rpm then drops to 1500rpm when the check engine light comes on , even when it's at normal operating temperature. When I drive the car it frequently stalls when stopped. It has only just started to do this. Model No BF5D49P Engine Type EJ20 Transmission Type TZ Option Code EX. Hopefully someone can point me to where this problem is .
The revving to 2000 then dropping the 1500 likely means that it is in "limp home" mode. When there is a serious problem, the car will put itself in this limited mode to avoid further damage, and to get itself back home without stalling (hence the name). Since it stalls, its likely that there is a serious problem with the fuel system, and the limp home mode will not help you any more since you keep driving it like that.
As far as the problem goes, it could be just about anything. Almost positive it has to do with the fuel system, but could be so many different things.
Hope this helps!
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All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.
ther are no lubriction points on the driveshaft,if you rev the engine does the noise get louder or go away?try power braking the car ,make sure e-brake works properly if so apply it ,place the car in drive,place your left foot on the brake ,right on the accelerator,rev to 2000rpm for no more than 10 sec, this is like puttting a load on the drive train,this may unmask your noise,it appears this may be some sort of exhaust rattle since nothing is moving undereath car
Sounds like the timing is lost, go get your engine timed, change plugs and check the continuity on the spark plug cables, also have it scanned for errors on the sensors, that should lead you straigh to the real issue, hope this helps ;-)