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Where is the idle speed control valve located on a 1997 Mercedes e320?

The idle speed control valve on your 1997 Mercedes E320 is installed on the back of the throttle body. It looks like a small cylindrical device, approximately two or three inches in length, with electrical connectors and one or two vacuum hoses. It serves to control and regulate the engine's idle speed. Please note that accessing the idle speed control valve may require some disassembly and could involve removing the air filter housing or other parts for more straightforward installation. It's always best to refer to a car manual or consult with a qualified mechanic if you're not familiar with automotive repairs.