Chrysler 4792962AA Valve-PCV

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Shake the removed valve to check for a rattle. If it doesn't, it's clogged and needs replacement. Look for oil and sludge deposits on the valve and hose. For V6 engines, detach the hose and unscrew the valve from the intake manifold or valve cover. For V8 engines, twist and undo the valve from the intake manifold.

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.

A functional check involves verifying vacuum presence at the PCV hose, using a vacuum gauge to test the system, and checking for positive pressure, which may indicate leaks or blow-by. In case of engine oil in the throttle body or air filter housing, crankcase pressure should be tested. Additionally, heavy sludge deposits or oil dilution might signal other issues that require correction.

To maintain idle quality, the PCV valve restricts the flow when the intake manifold vacuum is high. If abnormal operating conditions arise, the system allows excessive amounts of blow-by gases to flow back through the crankcase vent tube into the air cleaner to be consumed by normal combustion.

The PCV valve restricts the flow when the intake manifold vacuum is high to maintain idle quality.