The 2003 Buick Lesabre has a history of engine gasket failures. The intake manifold and oil pan gaskets are common replacement requirements that can cost you in excess of $700 to have repaired. Replacing the Positive Crankcase Ventilation Valve (PCV) can keep crankcase gases from building up in the engine and extend the life of the gaskets. The PCV valve is often overlooked as a maintenance item on this engine due to it's location.
Things You'll Need
- Flat-head screwdriver
- 5/8" socket
- Socket extension
Open the hood. Remove the oil filler cap. Remove the oil filler neck by twisting it counterclockwise until it releases. Remove the engine cover by lifting the front of it and pulling it towards you to release the rear mounting tap.
Locate the MAP sensor on the intake manifold towards the front of the engine. This sensor will have three wires- orange/black, light green, and grey. Lift the connector locking tab and remove the connector. Remove the MAP sensor by releasing the locking tabs with the screwdriver.
Remove the PCV valve cover under the MAP sensor by pressing a 5/8 -inch socket against it and twisting it counterclockwise a quarter turn. Remove the PCV valve and the O-ring. Wipe oil and debris from the mounting area.
Install the new PCV valve and O-ring by pressing it firmly into place. Install the PCV cover plate by pushing down on it with the socket and twisting it clockwise until it stops. Replace the seal on the MAP sensor if it is damaged. Install the map sensor slowly, taking care not to damage the mounting tabs. Snap the wiring connector into place.
Install the engine cover, making sure that the rear tab is inserted into the mounting bracket. Replace the seal on the oil filler neck if damaged. Install the oil filler neck. Install the oil filler cap.
Tips & Warnings
- Replace the PCV valve every 30,000 miles
- Do not allow any debris to fall into the engine with the PCV valve removed.
- AllData.com; 2003 Buick LeSabre; Powertrain Management, Emissions, PCV valve; Service and Repair
- Photo Credit Getty Images/Getty Images News/Getty Images