Jeep 53034065AA Valve-PCV

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The crankcase ventilation system reduces hydrocarbon emissions by scavenging crankcase vapors. It circulates fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases. These gases are then drawn by intake manifold vacuum into the intake manifold, mixing with the incoming air/fuel mixture and are consumed during normal combustion. These models utilize a Positive Crankcase Ventilation (PCV) system. The main component of this system is the PCV valve. Fresh air flows from the air intake duct through a vent tube into the crankcase. Crankcase vapors are drawn from the crankcase by the PCV valve. To maintain idle quality and driveability, the PCV valve restricts the flow when the intake manifold vacuum is high. When intake manifold vacuum is lower, maximum vapor flow is allowed through the valve. Checking and replacement of the PCV valve is covered in the provided procedures.

On Hemi engines, the PCV system consists of a fresh air inlet hose and PCV valve.

Inspect for a plugged hose, manifold port, or a faulty valve. Replace any plugged or deteriorated hoses.

If the PCV system is clogged or leaking, it can cause rough idle, stalling, oil leaks, or sludge buildup.

With the engine idling at normal operating temperature, remove the valve and place your finger over the opening to check for vacuum.

A clogged or leaking PCV hose may cause rough idle, stalling, low or high idle speed, oil leaks, or sludge buildup.

The crankcase ventilation system reduces hydrocarbon emissions by scavenging crankcase vapors and circulating fresh air from the air cleaner through the crankcase.

The PCV valve on a 4.7L engine is located at the top rear of the left valve cover.

To check the PCV system's functionality, disconnect the crankcase ventilation hose and verify vacuum presence using a vacuum gauge.