Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - whistle sound during acceleration
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Old 04-21-2012, 12:01 AM   #11
mstng46
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you can use a can of brake cleaner around the intake boots, if the idle rises then you know you've got a vac leak there. not really that difficult to find, could be a cracked intake aswell. good luck!
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