Noticable whistling from top of engine, loudest in valley under intake manifold?? Sound gone if oil cap opened or vent hose to vapor separator removed. Does not seem to have excessive crancase vacuum as when vent valve fails on M156 engine. Cannot find functio...

FIX posted 9/14/2016

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle