1980-84 All Models
WARNING: This page does not describe the selected car, but rather 62 other vehicles, including the 1996 Volvo 850, 1995 Volvo 960, 1995 Volvo 940, 1995 Volvo 850, and 1994 Volvo 960. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure engine is at normal operating temperature. Install "T" fitting between vacuum port and EGR valve. Connect vacuum gauge to "T" fitting. Start engine and increase engine RPM. Vacuum should be present and EGR valve should open. Release throttle quickly. EGR valve should close. If vacuum is not present, clean vacuum port at intake manifold.
- Disconnect vacuum hose from EGR valve and plug hose. Apply vacuum to EGR valve. Engine should run rough or stall. If EGR valve functions as described, system is functioning properly.