Question

what is the problem if you have the code P3631 on a 2007 infiniti G35sport

Answer 1

We can't find any information in the service manual for the P3631 code? how did you get the code?

For the P0011 you may have to replaced the Intake Valve Timing Control Solenoid Valve.

P0011 INFINITI - Intake Valve Timing Control Performance Bank 1

Read more: https://www.autocodes.com/p0011_infiniti.html