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The Problem: The DISA valve, otherwise known as the Intake Manifold Adjuster Unit, is located on the side of the intake manifold and is a common failure on the M54 BMW engines. The failure is caused by the type of materials used in the manufacture of two of the three key valve components.
Ignition (DIS) Module: it receives the signal from the crankshaft sensor and the camshaft sensor. It also receives the spark signal from the vehicle's central computer. Its major purpose is to use the information supplied to it to control the ignition coils. The reason it does this is to ensure that they fire in the correct sequence. The DIS module also controls the engine dwell. Ignition Coil Pack: it is comprised of multiple ignition coils. The DIS module controls these coils by means of coil leads. The ignition coils fire two spark plugs simultaneously; one on the compression stroke and one on the exhaust stroke.