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Loud blowing sound when boosting causing horrible boost pattern???

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Old 10-09-02, 05:48 PM
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Loud blowing sound when boosting causing horrible boost pattern???
when my car builds boost, i hear a loud blowing sound coming from underneath the hood. i have checked all of my connections but i found nothing. i get 10 in first but after that it gets around 5-8. could it be a bad BOV of ACV?
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Old 10-09-02, 06:48 PM
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It could aslo be your vacum hoses could of slipped out or just or jsut need to tighten BOV! But you have aboost leak for sure!
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Old 10-09-02, 07:14 PM
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i think you are on the right track. BOV, ACV, Large diameter hose couplers, intercooler piping. etc.
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Old 10-09-02, 07:24 PM
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Well the boost pattern doesn't match this problem but it still might be worth a shot.

The rubber coupler from the y-pipe to the crossover pipe splits right where the coupler meets the y-pipe. Hard to see with the coupler on the car.

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Old 10-09-02, 09:44 PM
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thank for the hints. i will look more tomorrow. i have nice aftermarket couplers so i hope they are not split. how can i tell if my BOV or my ACV are bad?
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Old 10-09-02, 11:57 PM
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Y-pipe coupler should be checked first. Take it off and bend it around looking for cracks. If it's loud "whoosh" it's most likely that.
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