iac passage noise
Thread Starter
Joined: Jul 1999
Posts: 12,096
Likes: 126
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
iac passage noise
My holley 4bbl, the iac passage at idle whines so loud it sounds like a big roots blower. If I give it a little throttle the air goes to the throttle blades and the sound goes away.
Anyone ever experience this harmonic noise from the iac passage on a 4bbl throttle body? When I say it's loud I mean, can be heard in the next town over..
-- Joe
Anyone ever experience this harmonic noise from the iac passage on a 4bbl throttle body? When I say it's loud I mean, can be heard in the next town over..
-- Joe
Joined: Oct 2001
Posts: 12,223
Likes: 1,148
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: iac passage noise
Had the same issue with a BBK 58mm T-body. Its the angle of the blades and the way the air goes between it and the bore housing.
I put a small groove in the edge of the blade with a file and it helped a little bit.
I put a small groove in the edge of the blade with a file and it helped a little bit.
Thread Starter
Joined: Jul 1999
Posts: 12,096
Likes: 126
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: iac passage noise
Either way, it's stupid loud.
-- Joe
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sjorgens
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Oct 1, 2015 07:54 PM
