Question about 2004 Mazda 3

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I have aknocking noise from a rebuilt engine on 04

I have a knocking noise from a rebuilt engine on 04 mazda 3. Ihave already changed the balancer unit.

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Not a good thing. More than likely it's the rod or main bearings.

Posted on Dec 12, 2009

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Posted on Jan 02, 2017

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If it is a ticking noise, it will more than likely be a valve train issue.
If a knocking noise, piston or crankshaft related problem.

Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Regards,

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