Changes

Vacuum lines and PCV components should be inspected every 30k miles or more often, and replaced as needed. Rubber hoses become brittle with age, and deterioration and small cracks can be hard to see. Original vacuum hoses are 4-mm inside diameter (ID), same size as most of the wiper washer hoses. The same rubber hose is also used in the secondary air injection (SAI) system on n/a models. I replaced all of mine around 100k miles, some for the second or third time.

=== Parts ===

* Vacuum Hose