High Pitch Moo Sound
03-26-05, 04:19 PM
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High Pitch Moo Sound
I removed my airpump+acv and installed blockoff plates on both the acv location and the outside of the LIM where the two pipes attached. I still get this whiny moo sound sometimes between 2000-2500 rpms though. It's not the same moo sound when the airpump is not muffled but rather its more high pitched and quieter. I hope I made myself somewhat clear but it's hard to describe the sound. Has anyone had a similar problem on their car?
03-27-05, 10:48 PM
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checked the hoses I could see without removing the uim and everything looked good. As for the intake, I am using ebay hard pipes with K&Ns. The stock bovs are vented to the atmosphere and the pipes for the airpump/acv are removed. It's weird the sound only happens every once in a while.
03-28-05, 08:20 AM
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try removing the intake temporarily and run the car. if it doesnt make the noise then you've found your problem. i dont recommend driving around without filters, but in your driveway its totally fine....unless you have the gardeners over with their dustblowers.
03-28-05, 09:12 AM
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If you're just venting the bov and abv then that could be the source of the noise. When the valve(s) open slightly they could certainly resonate and make noise. I would check them per FSM to ensure they are sealing properly. A leaky one could squeal.
As an aside, I don't know if those are designed to hold vacuum, and could potentially take unfiltered air in if you're just venting them... there's a reason they are originally routed to the factory air box, either for noise or for filtering.
As an aside, I don't know if those are designed to hold vacuum, and could potentially take unfiltered air in if you're just venting them... there's a reason they are originally routed to the factory air box, either for noise or for filtering.
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03-28-05, 11:37 AM
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Does anyone have this sound with the pettit intake and a solution to get rid of it? This is the pettit with two big filters, one smaller, heat shield, and this plastic tube.
I checked out these threads:
https://www.rx7club.com/showthread.p...t=intake+noise
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/moowing-sound-so-bad-104522/
And they mention the pettit comes with silencers. They are two black things in series on a clear hose that vents straight down, I can see them on mine. (Circled in red in the pic, excuse the mess) Either i've got another problem or they aren't working. On the highway between 2-3k in 5th i've got a horrible howling noise, worse at partial/no throttle. Trans has been rebuilt and diff was replaced with a kaaz so i've ruled those out. Thanks for any ideas.
I checked out these threads:
https://www.rx7club.com/showthread.p...t=intake+noise
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/moowing-sound-so-bad-104522/
And they mention the pettit comes with silencers. They are two black things in series on a clear hose that vents straight down, I can see them on mine. (Circled in red in the pic, excuse the mess) Either i've got another problem or they aren't working. On the highway between 2-3k in 5th i've got a horrible howling noise, worse at partial/no throttle. Trans has been rebuilt and diff was replaced with a kaaz so i've ruled those out. Thanks for any ideas.
Last edited by airborne; 03-28-05 at 11:40 AM.
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