Engine braking produces the highest vacuum that the system can see. All you need is a manometer to attach to the oil cap to see these things.
And its all you need to check the health of an AOS.
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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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