2006 impreza vibration/rattling noise from underneath at 2000-2600 rpms

2006 SUBARU IMPREZA
76,100 MILES • 4 CYL • AWD • AUTOMATIC
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CMERRILL8
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My 2006 subaru impreza is making a strange vibration/rattling noise that seems to be coming from underneath me, and more to the front. I can't physically feel the vibration, just hear it. This noise only happens when I am at 2000 rpms and accelerate up to about 2600 at a nice and steady pace. When I accelerate quickly I get little to no noise at all. The noise sometimes gradually wears off after a couple seconds (if i keep the rpms steady in that range). I've also noticed that it happens when the engine is revving down past the 2500-2000 rpm's range.
May 9, 2011 at 5:48 PM
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DOCFIXIT
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Suspect exhaust is causing noise maybe CAT
May 9, 2011 at 5:52 PM
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FIXITMR
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probably some exhaust sheilding is making noise. i've run into this quite freqently on many vehicles. they always get louder within a specific rpm range.
May 9, 2011 at 6:06 PM
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SIXPACK SUBARU
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I agree with fixitmr, heat shields are a large problem...and on your model, the cross-over pipe junctions heat shields are known specifically for cracking near the spot-welded nuts on the heat shield itself...get someone to have a good look at them....a 'fine rusty line' is indicative of a heat shield fracture/crack.
Jun 20, 2011 at 1:03 PM