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Originally Posted by blue2000s
I've been experiencing a SLIGHTLY bumpy idle, like +/-50RPM. Cleaned the throttle body, no change. I disconnected the hose here and found a little coating of nice, fresh smelling Royal Purple. RP has a really distinctive smell.
Is this a sign of impending AOS failure?
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a thin coating of oil here is normal as this is where oil vapor re-enters the throttle body to be burned. the usual point of failure on the aos is the bellows that connects it to the crankcase. it's located directly below the aos. use carb cleaner or propane or such to check for vacuum leaks.
if the membrane in the aos is bad, you will see a LOT of oil at the throttle body / aos coupling.