How to Repair a 2001 Nissan Maxima PCV

The Positive Crankcase Ventilation valve, or PCV valve, in your 2001 Nissan Maxima prevents the crankcase emissions from flowing back into the engine, causing a rough idle and poor-running car. When the PCV valve wears out, replace it to keep your Maxima's engine running at its best. Buy a replacement valve from an auto-parts retailer and change it at home in minutes.
Difficulty: Easy
Instructions
1

Open the hood of the Maxima. Locate the PCV valve on the driver's side of the valve cover, near the firewall. It is a black, elbow-shaped valve with a rubber vacuum hose attached to the end.
2

Pull the vacuum hose from the exposed end of the valve. Grasp the top of the valve and pull it straight out of the valve cover.
3

Insert the new PCV valve into the cover, pushing it into place until it is secure. Push the vacuum line onto the open end of the valve and make sure it is tight.
4

Start the engine and listen for any skipping or rough noises during idle -- they would indicate that you may not have inserted the valve completely.