Buy OEM 1991 Mazda Part # PY0113890 (PY01-13-890). PCV Valve. 2.5 LITER NON TURBO. 2.5 LITER NON TURBO, 2017. 2.5 LITER NON TURBO, 2018-24. 2.5 LITER, ENGINE COMPARTMENT. CX-30; w/o Turbo

PCV Valve.
PCV Valve. Serviced with Oil Separator. Included with: Separator.

Secondary Air Injection SolenoidPCV Valve

Fits 3, 6, CX-30, CX-5, CX-50

2.5 LITER NON TURBO. 2.5 LITER NON TURBO, 2017. 2.5 LITER NON TURBO, 2018-24. 2.5 LITER, ENGINE COMPARTMENT. CX-30; w/o Turbo. CX-5. CX-5; 2.5L. CX-5; 2.5L; w/o Turbo. CX-50; w/o Turbo. FRONT COMPONENTS, 2.5 liter. Mazda3; 2.5L. Mazda6. W/O 2.5 LITER TURBO, W/CYL DEACTIVATION, 2020-21. W/O 2.5 LITER TURBO, W/O CYL DEACTIVATION, 2020-22.
PCV Valve - Repair or Replace
If your PCV system is malfunctioning, you may notice any of several symptoms: if your tailpipe smokes or your engine idle speed is high or erratic, the PCV valve or its associated parts may need service. You may also notice that the dipstick in your 1991 Mazda won't stay in the dipstick tube, or that your oil cap hisses as the engine is running.