Loss of pressure control to the secondary pulley. Low pressure to the pulley causes chatter, push belt slip, surface fretting and metal contamination. With low pressure, pully diameter will not change and ratio remains the same.
Refurbish the bore using the Sonnax tool kit and install the Sonnax control valve and end plug.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Contact a Sonnax Parts Distributor.
Vacuum testing at designated test point indicates less than 16 in-Hg