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if it is more of a slapping rattle like metal to metal for every revolution of the motor check your crank pulley... my Zuk was making a similar noise... ended up being the 4 bolts holding the pulley on and sheared them right out of my crank sprocket... it sounds rediculous but trust me its worth checkin out

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Q: 87 Samurai engine has a rattle when cold When it warms up the rattle goes away what the heck is going on?
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