What's loud sucking sound from air filter box at startup? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-25-2008, 07:03 PM   #1
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Default What'* loud sucking sound from air filter box at startup?

What is this very loud sound that comes from air filter box, in the space ahead of the air filter right next to the air inlet in the fender well? It'* like a sucking/grinding sound kind of mixed together. Is this normal for a non supercharged 2000 SE?

It is quite loud and very noticeable at startup, then dies down quite a bit in about 20 sec. It normally goes away completely when driving or idling for awhile. To be normal vacuum pressure, it just seems awfully loud coming from in there.
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Old 03-25-2008, 07:20 PM   #2
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Normal cold-start high-idle IAC (idle air controller) flow. We all have it.
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Old 03-25-2008, 07:57 PM   #3
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Now if you gut your airbox or put a FWI or CAI, look for that noise to become a little louder.
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Old 03-25-2008, 08:12 PM   #4
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If this is a California Emissions car you will have an AIR system that allows air into the Cat during your start to allow the cat to come up to temps quickly... This would make this car a Low Emissions Vehicle...

Look at the Emissions label and see if the is a California Emissions car... If it is you do get a hideous sucking sound from it for a short time..

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Old 03-25-2008, 08:30 PM   #5
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Quote:
Originally Posted by jr's3800
If this is a California Emissions car you will have an AIR system that allows air into the Cat during your start to allow the cat to come up to temps quickly... This would make this car a Low Emissions Vehicle...

Look at the Emissions label and see if the is a California Emissions car... If it is you do get a hideous sucking sound from it for a short time..
where is said label. My car was origionally a rental from California I've always wondered whether it has a special emmissions package and what it consists of and how to remove it
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Old 03-25-2008, 08:35 PM   #6
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Honestly I don't think removing it would really gain you more power.... I have driven a California Emissions Bonneville and it felt as good as the rest... Just maybe slightly cleaner emissions

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Old 03-25-2008, 09:59 PM   #7
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There is no power to be gained. The emissions label is required by the EPA (federal law) to be under your hood in a 'conspicuous position'.
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Old 03-25-2008, 11:58 PM   #8
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Well that would be a first. Usually california emmisions make cars gutless. I always hated the rentals I drove in CA compared to other states but who knows maybe it was all in my head.
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Old 03-26-2008, 12:27 AM   #9
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The difference between CA cars and 'normal' cars USED to be different. There'* virtually no difference now, and in most cases, the vast majority of new cars comply with CA'* CARB regulations (California Air Resources Board).

(native CA here).
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Old 03-26-2008, 12:52 AM   #10
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cool - learn something new everyday
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