flutter noise on deceleration - Cadillac Forum - Enthusiast forums for Cadillac Owners


Cadillac CTS The mid-sized sedan that has grown the popularity of the Cadillac brand with it's low price and sleek styling

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Old 09-17-2017, 01:07 AM
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Default flutter noise on deceleration

my V6 CTS has a flutter type noise any time I decal. It is not present at idle or at cruise. I have disconnected almost all of the vacuum systems to no avail. Any ideas? I have thought maybe the throttle body blades flutter at the closed position. Any help would be appreciated. racerjim
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Old 09-27-2017, 10:54 PM
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I have drilled tiny 1/8 inch holes in both throttle blades. My first road test revealed no more flutter noise. It appears problem solved !!
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Old 10-03-2017, 09:36 AM
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Well I am wrong. The flutter is back. Help Please. racerjim
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Old 02-22-2018, 10:01 PM
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I have found that the "dirty PCV hose" that I believe has a check valve in it flutters on decel. I removed it and road tested it, NO MORE FLUTTER NOISE I will try to find a replacement hose assy and move on to other things. I hope this may help others that have a similar noise.
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