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1975-79 All Models With Vacuum Amplifier

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.

Start engine and allow to idle. Disconnect one wire from throttle valve micro switch. EGR valve should open and cause engine to run rough or stall. If engine does not run rough or stall, EGR valve is defective if all other EGR components are okay.

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