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Old 10-15-2019, 08:56 AM   #15
Anker
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Join Date: Sep 2016
Location: Stow, MA
Posts: 918
Garage
If its that hard to remove the oil filler cap you have a dead AOS. Replace the AOS and see what happens. When the membrane in the AOS splits, which yours already has done, you have a vacuum leak. fix the known problems first and then you can start working on the unknowns.
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