Buy Chevrolet Express 3500 PCV Valve. PCV Valve - Repair or Replace If your PCV system is - OEM Chevrolet Part # 25043843

Crankcase. Valve Assembly - PCV.
1st Design. PCV Valve.

PCV Valve

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 Chevrolet Express 3500 won't stay in the dipstick tube, or that your oil cap hisses as the engine is running.