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If this squeal is loudest at idle and off-idle transition it could be the AOS failing. When this occurs crankcase vacuum skyrockets and air is pulled by the front crank seal, which makes a squealing sound. Not all AOS' fail with this symptom, and it is rare.
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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