The PCV Hose of the Ford Explorer Sport Trac functions as channels that transport crankcase vapors to the intake so the vapors burn rather than pollute. Throughout the production years, Ford outfitted each Explorer Sport Trac with a sealed positive crankcase ventilation loop (PCV). The unit employs a flexible hose to route blow-by gases from the crankcase to the intake manifold. This use of PCV preserves fuel economy and reduces harmful emissions. There are two types, one being the early soft rubber PCV Hose and the other a later rigid molded plastic version. Nevertheless, they both travel from the valve cover to the spring-loaded PCV valve. It is then the engine vacuum that draws the fumes toward combustion. When intact, the working assembly keeps the air-fuel mixture steady. However, a cracked PCV Hose allows in unmetered air, resulting in rough idle and extra smog. Replacing a worn PCV Hose doesn't cost a lot and allows the engine to breathe freely. For early Explorer Sport Trac units, the PCV Hose is usually mounted on the passenger side. The later Explorer Sport Trac models have it mounted on the driver side. Checking placement ensures the correct fit. Choosing a direct fit replacement maintains Ford performance and enables DIY owners to complete the job quickly.
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