Addicted2boost
July 1, 2021
Underneath this foam insulation are 2 breathers that are for the PCV system. They are a rubber diaphragm and do go bad. When they go bad it’s an unmetered air leak that makes the engine run poorly. I’ve replaced several of them. I know this is insignificant until you get to reassembly but I forget a lot and wanted to tell you now rather than never.
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