Cylinder 8 Deactivation/Intake Valve Performance

Where it lives

For P349F, the description names the valve as the part involved. The description of P349F puts it on cylinder 8.

Check these first

• Carbon buildup restricting the cylinder 8 intake valve actuator
• A failed actuator motor or solenoid on cylinder 8
• Mechanical binding in the cylinder 8 actuator linkage
• A broken or weakened cylinder 8 actuator return spring
• Worn internal parts inside the cylinder 8 actuator assembly

What to do next

1. Read the stored code and freeze frame data on a scan tool
2. Command the cylinder 8 intake valve actuator through its full travel
3. Compare the commanded and actual cylinder 8 actuator positions
4. Inspect the cylinder 8 actuator linkage for binding or carbon
5. Replace the cylinder 8 intake valve actuator if it fails the travel test
6. Clear the code and retest

Look up another code