Audi C5: A6 ATQ V6 Secondary Air Pump: Part 1 Removal ... (Jay Lynch)
Here is a quick video on how a Secondary Air Injection System works and how you can diagnose problems within the system. Structure & function ✓ Symptoms & causes of secondary air injection system malfunction ✓ Information for The secondary air system reduces harmful exhaust constituents during the cold start phase. Then the secondary air pump itself eventually fills up with water and also seizes.
The problem is the vacum valve on the back of the head gets corroded through moisture and seizes.
If the system was shoddily bypassed (like the part rusted right off, or, more.
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My SAI pump is noisy and about to go out, from what I'm told, and I'm cheap. The system uses an air pump to inject air into the exhaust when a cold engine is started. Structure & function ✓ Symptoms & causes of secondary air injection system malfunction ✓ Information for The secondary air system reduces harmful exhaust constituents during the cold start phase.
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