dbfitz Posted April 6, 2009 Share Posted April 6, 2009 Well I replaced a 2000 2.5 SOHC in my Forester with the same engine except it's a 2004. Everything went well, it runs fine but there is a noise I don't remember hearing before. It is kind of a low humming sound, it is NOT rpm or even engine related because I can get the sound briefly with the engine off. After turning the key to on position it happens for a few seconds then stops. While the engine is running it is continuous, same pitch, same volume. Does the fuel pump sound like a possibility? I can't see how a swap would cause any change in the fuel delivery system, maybe it was always there and I'm listening more closely now... Any ideas? Thanks Quote Link to comment Share on other sites More sharing options...
davebugs Posted April 6, 2009 Share Posted April 6, 2009 Some IAC's are noisy - was it noisy before? Any CEL's Just guessing/asking. Quote Link to comment Share on other sites More sharing options...
nipper Posted April 6, 2009 Share Posted April 6, 2009 Check the ABS pump. Use a screwdriver as a stethascope and see if you can find the hum. nipper Quote Link to comment Share on other sites More sharing options...
kudd Posted April 8, 2009 Share Posted April 8, 2009 Air box sealed tightly? We have some broken clips on a '98 and it hums where it doesn't seal tightly around the filter...well, before the screws it did. Quote Link to comment Share on other sites More sharing options...
nickb21 Posted April 8, 2009 Share Posted April 8, 2009 Sounds like maybe ABS or fuel pump. Did you try to pull the ABS fuse(s)? I would imagine that you could pull the fuel pump fuse as well while the car is running, it should run for at least a second or two... maybe... Quote Link to comment Share on other sites More sharing options...
Gloyale Posted April 8, 2009 Share Posted April 8, 2009 If it is an automatic, you could be hearing one of the duty solenoids. They hum pretty loud on some cars. Quote Link to comment Share on other sites More sharing options...
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