2006 Eclipse: Noise during accleration

2006 MITSUBISHI
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AZRAG
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I have a 2006 Eclipse GS, 5 speed manual, nothing crazy or odd modifications, factory spec'd.

During acceleration I hear a 'rattle' between 2500 and 3000 RPM. Rattle is the best word I can think of, sounds almost like, metal ball bearings inside a tin can... pinging/rattle noise.

If i don't pause and continue to accelerate it goes away right at (just before) 3000 rpm.

I don't have a clue where to start or what to look at so any help/information would be great!!
Jul 10, 2007 at 11:20 AM
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JAVA MOTORSPORTS
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Sounds like valve rattle or octain knock. Try higher grade of gas and see if that fixes your problem also put some injector cleaner in at the same time. After that drive it for a few days and let me know if it is still doing it.
Jul 11, 2007 at 11:49 AM