PCV Valve

Replace the PCV valve on a 2005 Dodge Viper 8.3L V10 to restore proper crankcase ventilation and prevent oil consumption or rough idle issues.

Warnings

Tools required

Parts

• PCV valve × 1 — Mopar 4891852AC or equivalent
• PCV valve grommet (if damaged) × 1 — Inspect and replace if cracked

Preparation

1. Park vehicle on level ground and turn off ignition
2. Allow engine to cool to ambient temperature if recently operated
3. Open hood and secure with prop rod
4. Locate the PCV valve on the passenger-side valve cover toward the rear; it has a rubber grommet installed in the valve cover with a vacuum hose attached

Procedure

1. 1

   Disconnect vacuum hose from PCV valve
   Trace the vacuum hose from the PCV valve to the intake manifold. Firmly grasp the hose near the PCV valve connection and pull straight off the valve nipple with a twisting motion. If the hose is stuck due to age or oil residue, gently work a flathead screwdriver between the hose and valve nipple to break the seal. Do not pull on the hose itself away from the connection point as this may tear the hose.
2. 2

   Remove PCV valve from valve cover grommet
   Grasp the body of the PCV valve firmly and pull straight upward out of the rubber grommet in the valve cover. The valve is a press-fit into the grommet and may require moderate force. Twist the valve while pulling if it resists removal. If the grommet comes out with the valve, this is normal and you will reinstall both together.
3. 3

   Inspect grommet and valve cover opening
   Examine the rubber grommet remaining in the valve cover (or removed with the valve) for cracks, hardening, or tears. A damaged grommet will cause a vacuum leak and must be replaced. If the grommet remained in the valve cover and is in good condition, leave it installed. Clean any oil residue from the grommet bore in the valve cover with a shop rag. Check for debris or sludge buildup around the opening.
4. 4

   Test old PCV valve function
   Shake the old PCV valve and listen for a rattling sound from the internal check ball. If no rattle is heard, the valve is stuck and confirms replacement is needed. Attempt to blow through the valve from the valve cover end toward the hose end with your mouth; air should pass with moderate resistance in one direction only. If air flows freely in both directions or is completely blocked, the valve has failed.
5. 5

   Prepare new PCV valve
   Remove the new PCV valve from packaging and verify it matches the old valve in physical dimensions and connector orientation. Shake the new valve to confirm the internal check ball rattles freely. If installing a new grommet, remove the old grommet from the valve cover by prying it out with a flathead screwdriver, then press the new grommet into the valve cover bore by hand until it seats flush against the valve cover surface.
6. 6

   Install new PCV valve into grommet
   Align the new PCV valve with the grommet opening in the valve cover. The valve has a tapered end that fits into the grommet. Push the valve straight down into the grommet with firm hand pressure until it seats completely; you should feel resistance as the grommet grips the valve body. Ensure the valve nipple (hose connection end) faces toward the intake manifold for easy hose routing. The valve should be snug but not require tools to install.
   Torque spec

   PCV Valve8 Nm (6 lb-ft)
7. 7

   Reconnect vacuum hose
   Push the vacuum hose firmly onto the PCV valve nipple until it bottoms against the valve body. The hose should slide on approximately 0.5-0.75 inches and grip the nipple securely. Tug gently on the hose to verify it will not pull off under normal vacuum pressure. If the hose is hardened or cracked, replace it to prevent vacuum leaks.

Reassembly

1. No additional reassembly required for this procedure

Verification

• Start the engine and allow it to idle. Listen for any hissing sounds near the PCV valve that would indicate a vacuum leak from improper installation or damaged grommet
• With the engine at idle, carefully remove the oil filler cap. You should feel slight vacuum (suction) at the opening, confirming the PCV system is functioning and drawing crankcase vapors
• Check for oil leaks around the PCV valve grommet after 5 minutes of idle operation
• Rev the engine to 2000 RPM briefly and verify no oil mist is visible around the PCV valve area, which would indicate a failed seal
• After a test drive, inspect the PCV valve hose connection to ensure it has not loosened from engine vibration

More procedures for this vehicle