Strange Noise After Engine Swap

[dbfitz]

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

[davebugs]

Some IAC's are noisy - was it noisy before?

 

Any CEL's

 

Just guessing/asking.

[nipper]

Check the ABS pump. Use a screwdriver as a stethascope and see if you can find the hum.

 

 

 

nipper

[kudd]

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.

[nickb21]

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...

[Gloyale]

If it is an automatic, you could be hearing one of the duty solenoids. They hum pretty loud on some cars.