A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
Intake Manifold: Testing and Inspection
Variable Intake Manifold, Checking
Only perform the test if there is a loss of torque. That means elasticity or engine torque is reduced.
Special tools, testers and auxiliary items required
‹› Hand vacuum pump (VAS 6213)
Test conditions:
‹› The Intake Manifold Runner Control (IMRC) Valve ( N316) was checked with the Vehicle Diagnosis, Testing and Information System (VAS
5051B).
If the intake manifold runner control valve (N316 ) is OK, perform the following tests:
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Remove engine cover carefully.
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Start engine and let run at idle.
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Have a 2nd person increase engine speed abruptly (press accelerator pedal). Observe the variable intake manifold vacuum actuator.
‹› The actuator must activate - arrow -.
If change-over does not function as specified:
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Check vacuum system for leaks.
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Check whether the change-over mechanism moves easily. Do this by actuating the linkage by hand.
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Check whether the vacuum lines are correctly connected.
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Make sure the vacuum hoses are not porous.
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Remove vacuum hose - 1 - on the intake manifold runner control valve (N316) - 2 - to the control valve actuator.