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?

 

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!

 

i think you are on the right track. BOV, ACV, Large diameter hose couplers, intercooler piping. etc.

 

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.

Jeff

 

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?

 

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.