Remove, install tumble flap and resonance flap switchover valve to intake manifold - AR09.20-P-1990SX

ENGINE 272, 273 in MODEL 221 

ENGINE 273 in MODEL 216 

Fig 1: Identifying Tumble Flap & Resonance Flap Switchover Valve Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Switch ignition off, remove ignition key (transmitter key)	On vehicles with code 889 Keyless-Go: Press Keyless-Go start/stop button repeatedly until the ignition is switched off. Remove Keyless Go transmitter card or transmitter key from the vehicle and store beyond transmitter range (min. 2 m).
2	Remove air filter housing		AR09.10-P-1150SX
3	Remove resonance intake manifold (5)		AR09.20-P-1961SX
4	Pull pneumatic line (1 or 2) out of switchover valve (Y22/6 or Y22/9)	Never use pointed or sharp tools to remove pneumatic line otherwise this may be damaged. Installation:  Check pneumatic line for damage and replace if necessary.
5	Remove lock washer (3 or 4)	Installation:  Replace lock washer.
6	Disconnect electrical connector (X205) at switchover valve (Y22/6 or Y22/9)
7	Remove switchover valve (Y22/6 or Y22/9) from resonance intake manifold (5)
8	Install in the reverse order
	Checking
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
9	Carry out an engine test run and check intake tract and fuel system for leaks