Question about 1993 Subaru Legacy

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High revs and surges when driving.

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 .

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  • J_K
    J_K Feb 03, 2009

    Cheers Alex for pointing me in the fuel system direction it turned out to be the ISC valve. There were metal shavings in it,,,

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Id say that its the idle control solenoid playing up. Its mounted on the back side of the inlet manifold on the passengers side. RHD model. Should have a plug with 3 wires on it.

Posted on Mar 06, 2009

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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!

Posted on Jan 23, 2009

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