Engine internals
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Opens a passage for fresh air into a cylinder.
In the cylinder head at each intake port.
The valve seals against its seat when shut and opens according to the cam and valve-control mechanism.
The entrance door to the combustion room.
Poor sealing or deposits can cause rough running or reduced airflow; testing is needed.
Usually condition-based rather than a routine replacement. Lubrication, overheating and the exact engine affect wear.
Internal-engine work is usually labor-intensive. Diagnosis and the engine code determine the repair scope.
Some BMW direct-injection intake valves are not washed by fuel in the way port-injected valves are.
BMW petrol and diesel engines; petrol-only systems are identified individually.
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