Jeep 53032940AB Valve-PCV

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The PCV valve regulates the flow of gases into the intake manifold based on intake vacuum. At idle, the PCV valve restricts vapor flow to prevent engine issues, while during throttle plate opening, it allows more vapor flow.

Make sure it's for your particular vehicle and engine size. Compare the old valve with the new one to make sure they're the same. Inspect the rubber O-rings for damage and hardening.

To remove the PCV valve on a 3.7L engine, you need to detach the hose from the PCV valve, then unscrew and remove the valve.

The Positive Crankcase Ventilation (PCV) system is an emission control device that reduces hydrocarbon emissions by scavenging crankcase vapors rich in unburned hydrocarbons. The PCV valve regulates the flow of gases into the intake manifold based on intake vacuum. Inspect the PCV system hose for damage or obstructions when servicing the engine. A clogged or leaking PCV hose may cause rough idle, stalling, low or high idle speed, oil leaks, or sludge buildup. To check the PCV system's functionality, disconnect the PCV hose, check for vacuum, and run the engine at 1500 rpm with the fresh air inlet hose pinched off. Correct any issues with the PCV system, and if there's evidence of engine oil in the throttle body or air filter housing, have the crankcase pressure tested. Excessive blow-by might indicate other underlying issues that need to be addressed.

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

The PCV valve on a 3.6L engine is located on the end of the right (passenger's side) valve cover. To remove it, detach the hose from the PCV, then remove the screws and pull the valve from the valve cover. Installation is the reverse of removal. For a 3.7L engine, the PCV valve is at the rear of the left cylinder head. Detach the hose from the PCV valve, then unscrew and remove the valve. Replace the valve with a new one and attach the hose. On a 4.7L engine, the PCV valve is at the top rear of the left valve cover. Detach the hose from the PCV valve and use a screwdriver to remove the PCV valve from the valve cover. Replace the valve with a new one and attach the hose. For 5.7L and 6.4L engines, the PCV valve is located in the top of the intake manifold, behind and to the right of the throttle body. It has a small twist handle recessed into the valve cover. Clean around the PCV valve before removing it to avoid getting debris into the engine. Turn the PCV valve a quarter turn counterclockwise, then pull it out. If you're reusing the old valve, check the condition of the two O-rings on it and replace them if necessary. Clean the sealing surfaces of the valve cover and clean it thoroughly. Apply a little clean engine oil to the O-rings of the PCV valve. Insert the valve, then turn it clockwise to lock it in place.

To check the PCV system's functionality, disconnect the PCV hose, check for vacuum, and run the engine at 1500 rpm with the fresh air inlet hose pinched off.