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Hello I have a 1994 3.slow and ever since I bought it I have had a high pitch sucking noise coming from the intake and I recently went to an aftermarket intake and in between swaping the intakes I tested if the noise was gone and its still there. Any ideas what it could be because its much louder with the after market intake and I would love to fix it, Thanks
 

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IIRC that's common, and there's simple fix.
Try searching.
 

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loud high pitched sucking noise

I don't understand how knock sensor could affect intake noise. I'm having strange noise in my intake driving me crazy trying to determine cause. Engine runs fine otherwise. No codes Thought It was bad water pump, then alternator but coming from intake.
 
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