knocking noise

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chriscivicesi

v-tec lover
hey guys,new to this forum so please be patient if this is in the wrong section.:D
i have an eg civic with a d16z6 engine.when sitting inside i can hear a knocking noise from unber the hood.but when u open the hood there's nothing.just the noise of the injectors.i had in on a lift in work and put my ear to the bottom of the engine and still nothing:confused: so that rules out crank bearings.goes away when u rev above 1500rpm.any ideas appreciated
 
My advice to you is to get a stethescope and try to pinpoint the source.
 
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