Hes holding your air filter and PCV valve and recommending that you replace both because they look dirty. Without missing a beat, he explains how critical the air filter is to the efficient ...

If your PCV valve is working properly, the paper should be sucked against the hole withinseconds. If the valve doesn't seem to be working properly, before you go to the trouble to replace it ...

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace ...

Here's a step-by-step guide on how to replace the PCV valve. The engine used in this guide is a 4.9-liter inline-6 in a 1991 Ford F-150. This engine is also referred to as the Ford 300.

the PCV valve maintains the optimal level of vacuum in the crankcase to extract the products of blow-by as well as potentially damaging moisture. Automakers may designate a replacement interval.