Gates EMH999 Engine Crankcase Vent Valve - PCV Valve

Gates EMH999 Crankcase Vent Valve

The Gates EMH999 crankcase vent valve is an OE-exact replacement for the emission ventilation system. Built with a steel body and direct-fit dimensions, it supports accurate crankcase pressure control and straightforward installation on select Buick, Chevrolet, and Pontiac applications.

Key Features

• OE-exact crankcase vent valve for emission control service
• Steel construction for durable underhood use
• Inside diameter: 8 mm (.32 in.)
• Single hose connector for direct replacement routing
• Includes PCV valve, spring, 2 O-rings, and retainer
• Part number: EMH999

Product Details

Gates EMH999 is part of the Gates Crankcase Vent Valve line, a product family focused on restoring crankcase ventilation pressure regulation and oil separation performance to OE-style operation. This replacement valve is built to match original fitment requirements, helping maintain proper ventilation flow in the emission control system. It cross-references GM service numbers 19431592 and 25043843 for the same application. Fits 2007-2009 Buick LaCrosse, PCV Valve; Fits 2006-2008 Buick Lucerne, PCV Valve; Fits 2004-2008 Pontiac Grand Prix, PCV Valve; Fits 2000-2005 Buick LeSabre, PCV Valve; Fits 2000-2005 Chevrolet Impala, PCV Valve; Fits 1997-1999 Buick Century, PCV Valve.

Common Issues This Part Addresses

• Excess crankcase pressure
• Rough idle related to ventilation flow problems
• Oil vapor control concerns in the crankcase ventilation system
• Emission system performance loss from a worn vent valve
• Fitment issues caused by a damaged or incorrect replacement valve

Installation Notes and Tips

Verify the vehicle application and hose connection size before installation. Inspect the surrounding crankcase ventilation components, including hoses and seals, for wear or contamination that could affect system performance. Use the included O-rings and retainer during service as required by the application.

Quality Assurance

Gates designs this crankcase vent valve as an OE-exact replacement to help restore the emission ventilation system to proper operation and performance levels. The EMH999 is engineered for direct fitment on listed Buick, Chevrolet, and Pontiac models.