Valve Inspection - Except Mazda6 (3.0L) & MPV

WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Remove PCV valve from valve cover. For location, see Figure, Figure or Figure . Blow air into port "A". See Fig 1 or Fig 2 . Air should flow from port "B". Blow air into port "B". Air should not flow from port "A". If airflow is not as specified, replace PCV valve.

Fig 1: Identifying PCV Valve - Mazda6 (2.3L), Protege & Protege5

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying PCV Valve - Miata

Courtesy of MAZDA MOTORS CORP.