RS 4 Quattro Sedan V8-4.2L (BNS) (2007)
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1. Remove the lower T pipe of the lower hose (Figure 3).
2. Connect a vacuum pump to the hose.
3. Activate Intake Manifold Runner Control (IMRC) Valve N316 with Vehicle Self Diagnosis >> 005 Output Diagnostic Test Mode.
4. Create a vacuum of 500 mbar.
5. Within a minute the vacuum must not drop by more than 10 mbar. Both tumble flaps must be operated.
6. If not correct, check the vacuum pipe between T pipe and tumble flaps for leaks and kinks.
Check the vacuum supply for the air filter box power flap
1. Remove the upper right hose on the double T pipe in driving direction (Figure 4).
2. Connect a vacuum pump to the hose.
3. Activate Intake Air Switch-over Valve N335 with Vehicle Self Diagnosis > 005 Output Diagnostic Test Mode.
4. Create a vacuum of 500 mbar.
5. Within a minute the vacuum must not drop by more than 10 mbar. The air filter flap must be open.
6. If not correct, check the vacuum pipe between T pipe and air filter flap for leaks and kinks.
Check the vacuum supply for the secondary air valves
