PCV Valve

This procedure covers the removal and replacement of the PCV (Positive Crankcase Ventilation) valve on the 2017 Maserati Levante 3.0L V6 Twin Turbo engine to restore proper crankcase ventilation and reduce oil consumption or rough idle issues.

Warnings

Tools required

Parts

• PCV valve × 1 — Use OEM Maserati specification
• PCV valve grommet/seal × 1 — Usually included with PCV valve
• Engine cover gasket/seal (if damaged) × 1 — Inspect and replace if necessary

Preparation

1. Park vehicle on level ground and ensure engine is completely cold
2. Disconnect negative battery terminal to prevent accidental electrical shorts
3. Gather all tools and replacement parts before beginning
4. Take photos of hose routing and electrical connections for reference during reassembly

Procedure

1. 1

   Remove engine cover assembly
   Remove the decorative engine cover by releasing the mounting clips or fasteners. On the Levante 3.0L V6 Twin Turbo, the cover typically has push-in grommets at the rear and may have quick-release fasteners at the front. Lift the cover upward and away from the engine bay. Set aside in a clean area.
2. 2

   Locate PCV valve on driver's side valve cover
   The PCV valve is mounted in the driver's side (left side when facing the engine) valve cover, typically toward the rear. It will have a vacuum hose connected to it leading to the intake manifold. Identify the valve location and trace all connected hoses for proper routing documentation.
3. 3

   Disconnect PCV hoses and electrical connections
   Carefully disconnect the vacuum hose from the PCV valve by squeezing the quick-disconnect collar or carefully prying the hose clamp. If there is an electrical connector on the valve assembly (some models have integrated pressure sensors), disconnect it by depressing the locking tab. Be gentle as the plastic connectors can be brittle.
   ⚠PCV hoses may contain oil residue; have rags ready to catch any drips and prevent spills on hot exhaust components.
4. 4

   Remove PCV valve from valve cover
   Using needle nose pliers or a suitable tool, grasp the PCV valve body and rotate counterclockwise while pulling upward. The valve may be threaded or held by a grommet seal. If threaded, unscrew completely by hand once loose. If resistance is felt, do not force; apply penetrating oil and wait 10 minutes before attempting removal again.
   Torque spec

   PCV Valve8 Nm (6 lb-ft)
5. 5

   Inspect valve cover port and grommet
   With the PCV valve removed, inspect the valve cover port for carbon buildup, cracks, or damage. Clean the port thoroughly with brake cleaner and a lint-free rag. Inspect the grommet or seal; if it is hardened, cracked, or remains in the valve cover, remove it carefully with a pick tool. The new valve typically comes with a new seal.
6. 6

   Inspect PCV hoses and check valves
   Inspect all PCV system hoses for cracks, collapse, or excessive oil buildup. Check any in-line check valves by blowing through them (they should allow air flow in one direction only). Replace any damaged hoses or valves. Clean hose ends with brake cleaner before reconnection.
   ℹ️Collapsed or oil-saturated PCV hoses will cause the same symptoms as a failed valve and must be replaced.
7. 7

   Install new PCV valve grommet
   If the new PCV valve came with a separate grommet, install it into the valve cover port first. Press it firmly into place ensuring it seats completely flush with the valve cover surface. Lubricate the grommet lightly with clean engine oil to ease valve installation.
8. 8

   Install new PCV valve
   Insert the new PCV valve into the valve cover port, aligning it properly. If threaded, thread it in by hand clockwise until hand-tight, then use a torque wrench to tighten to specification. Do not overtighten as this can crack the valve housing or damage the valve cover. If it is a press-fit design, push firmly until it seats with an audible click.
   ⚠PCV valves are typically plastic or composite material; overtightening will cause damage. Follow torque specification precisely or keep hand-tight if specified.
   Torque spec

   PCV Valve8 Nm (6 lb-ft)
9. 9

   Reconnect PCV hoses and electrical connections
   Reconnect the vacuum hose to the PCV valve, ensuring the quick-disconnect or hose clamp is fully seated and secure. If present, reconnect any electrical connector by pressing until it clicks into place. Verify all connections are secure by gently tugging on each hose and connector.
10. 10

    Reinstall engine cover
    Position the engine cover back onto the engine, aligning all mounting points. Press down firmly on each grommet location until the cover seats properly. Ensure no wires or hoses are pinched beneath the cover.
11. 11

    Reconnect battery and clear codes
    Reconnect the negative battery terminal. If a check engine light was present due to PCV system malfunction, it may need to be cleared with a diagnostic scanner. Start the engine and allow it to idle to verify proper operation.

Reassembly

1. Double-check all hose connections are secure and properly routed per your reference photos
2. Ensure no tools or rags were left in the engine bay
3. Verify the engine cover is properly seated and all mounting points are engaged

Verification

• Start the engine and listen for any vacuum leaks (hissing sounds) around the PCV valve area
• Allow engine to reach operating temperature and verify smooth idle with no hunting or roughness
• Check for any oil leaks around the PCV valve installation point after 10 minutes of running
• Verify check engine light does not return after clearing codes; if it does, re-check all connections
• Monitor oil consumption over the next 500-1000 miles to confirm improvement if excessive consumption was the issue

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